Andrea Kalendová

University of Pardubice · Institute of Chemistry and Technology of Macromolecular Materials

This work addresses the possibilities of using synthesized novel magnesium complex dyes in zinc pigmented organic coatings based on epoxyester resin to reduce the zinc content in these coatings while maintaining or increasing the anticorrosive efficiency of them. The magnesium complexes Mg-Dye-I (C34H26MgN8O6), Mg-Dye-II (C26H19MgN3O5), Mg-Dye-III...

This article deals with the simple preparation of environmentally friendly acrylic latex binders, which are functionalized with nanoparticles of metal oxides, namely MgO, ZnO, La2O3 and combinations of MgO and ZnO, serving as functional components to achieve antimicrobial properties, but also to improve physical–mechanical properties and chemical r...

Common latex coatings suffer from poor water resistance, which often limits their practical application. This paper reports on the preparation of polyacrylate latexes using various approaches to tune the water resistance, wettability, and surface properties of their coating films. The mutual effects of fluorinated monomer copolymerization, emulsifi...

Hybrid conductive paint pigments composed of zinc ferrites (ZF) and polyaniline (PANI) were analysed as both a potential electro-active and corrosion-protective paint from the electrorheological (ER) point of view. The particles were characterised using scanning electron microscopy and X-ray diffraction spectroscopy. These hybrid conductive particl...

Four new compounds from perylene dianhydride were prepared and tested for their anti-corrosion properties. Dizinc salt of perylene-3,4,9,10-tetracarboxylic acid and dimagnesium salts of perylene-3,4,9,10-tetracarboxylic acid, 5,5′-(1,3,8,10-tetraoxo-1,3,8,10-tetrahydroanthra[2,1,9-def:6,5,10-d′e′f′] diisoquinoline-2,9-diyl) bis(2-hydroxybenzoic aci...

In this study, an epoxy ester resin-based paint formulation incorporating spherical zinc as a pigment with a size range of 1–2 µm is investigated for usage in conjunction with impressed current cathodic protection, and the results are presented. Painted mild steel containing spherical zinc PVC = 61% exhibits negligible iron loss ∼ 0.48 ppm when use...

This paper deals with the development of acrylic latexes providing high-performance water-resistant coatings. For this purpose, mutual effects of anionic surfactant type (ordinary and polymerizable), covalent intra- and/or interparticle crosslinking (introduced by allyl methacrylate copolymerization and keto-hydrazide reaction, respectively) and io...

This paper deals with a facile fabrication of environmentally friendly hygienic coatings based on acrylic latex comprising embedded inorganic nanoparticles originating from nanostructured ZnO and MgO, respectively, in the role of antibacterial agents. The incorporation of surface-untreated powdered nanostructured oxides into the latex was performed...

A water-based polymeric acrylate dispersion (latex) containing MgO nanoparticles, which had been added at a concentration of 1.5% (with respect to the monomers) during the preparation procedure, was investigated as an environmentally friendly binder for sanitary interior paints. The properties of this new latex were compared to those of a reference...

This paper is focused on a simple preparation of functional acrylic latex coating binders comprising embedded nanoparticles originating from ZnO and MgO, respectively, in the role of interfacial ionic self-crosslinking agents. The incorporation of surface-untreated powdered nano-oxides into the coating binder was achieved in the course of the latex...

This work was devoted to the study of the properties of an acrylate latex-based binder synthesized by semicontinuous emulsion polymerization. Nanoparticles of zinc oxide (NPsZnO) in an amount of 1.5 wt% with respect to the polymer content were added to the binder during the synthesis procedure. The binder was then homogenized with various anticorro...

Water based paints are increasingly attracting interest mainly with a view to reducing air pollution with volatile organic compounds (VOC). However, the protective properties of water-based paints are inferior to those of solvent-based paints and so new ways to increase the resistance of water-based systems are sought. The present contribution desc...

The requirements put on coating materials are more and more stringent mainly in the environmental domain, especially as regards VOC emissions. This is why water-based binders as alternatives to solvent-based binders, to provide paints possessing equally good use properties, are intensively sought. The objective of this work was to assess the antico...

The objective of this work was to compare the anticorrosion effects of organic coatings containing zinc metal consisting of either lamellar particles or isometric particles and to reduce the zinc metal content of the coatings while preserving their high anticorrosion efficiency. The optimization and Zn metal content reduction can be achieved using...

The paper is focused on the use of phosphazene derivative in latex coatings. Hexaamino-cyclo-triphosphazene can act as a low-molecular-weight hardening agent for latex copolymers if the shell structure of latex particles contains molecules of glycidyl methacrylate. The coatings containing the fluorine atoms and hexaamino-cyclo-triphosphazene exhibi...

The paper deals with phosphazene derivatives used to ensure the chemical crosslinking of water-based coatings and, simultaneously, to increase their flame stability. Functionalized emulsion copolymers were prepared by the technique of semi-continuous emulsion polymerization. Resulting one-component coating compositions were formed by a combination...

Generally, organic coatings which contain zinc ferrites are able to protect metal substrate, most often low-carbon steel, by inhibition mechanism. Conductive polymers are using a system of conjugated double-bonds to transfer a charge over the chain thereby providing their own electrical conductivity in the organic coatings. The charge from the chai...

This study focuses on ambient-temperature self-crosslinking acrylic latex coating compositions containing poly(amidoamine) (PAMAM) dendrimers and ZnO nanoparticles in the role of inter-particle cross-linking agents and flash rust inhibitors. Low-generation amine-terminated PAMAM dendrimers as aqueous solutions were added into latices containing dia...

Functionality of polymeric coating, especially in terms of anti-corrosive properties and stability, can be negatively influenced by formation of either bacterial or fungal biofilm on its surface. Herein, the epoxy-ester resin based polymeric coating was filled with pigments (natural silicon dioxide diatomite, natural wollastonite, tungstate and mol...

Purpose The aim of the work is to develop an anticorrosion pigment based on an oxide mixture with lamellar particles. The pigments are prepared from lamellar zinc, zinc oxide and magnetite by calcination. An alkaline earth carbonate is added when embedding a third cation in the lattice of the ferrite that forms the envelope of the lamellar zinc. T...

The aim of this work was to describe polyaniline salts synthesized and to assess the mechanical and anticorrosion properties of alkyd resin-based coating materials pigmented with them, in dependence on the pigment volume concentration and type. Polyaniline salts were prepared by oxidative polymerization in the solutions of inorganic (hydrochloric,...

Mixed oxide-based pigments Mg–Zn–Fe with different particle morphologies were prepared by high-temperature solid phase reactions. The core shell pigments containing ferric oxide and non-isometric particles of layered silicates were also prepared. The pigments were tested in paints, the pigment volume concentrations in the modified alkyd resin based...

The anti‐corrosive and physical properties of organic coatings containing spinel pigments Mg0.2Zn0.8Fe2O4 wer studied. Pigments exhibiting different particle morphologies were synthesized by high‐temperature solid phase reactions. Core‐shell pigments containing Fe‐Mg‐Zn ferrite shells deposited on non‐isometric particles of mineral cores consisting...

The objective of this work was to examine the properties of molybdate or tungstate based pigments whose surface has been coated with a conductive polymer, viz. either polyaniline phosphate (PANI) or polypyrrole phosphate (PPY), if used as pigments in organic coating materials. The anticorrosion pigments were prepared by high-temperature solid-state...

The work describes the properties of perovskites pigments subjected to surface treatment with conductive polymers for use in protective coatings. The perovskites (XYO3; X = Zn, Ca, Sr; Y = Ti, Mn) were synthesised by high-temperature solid-phase reaction, and their surface was modified with a conductive polymer, specifically polyaniline phosphate (...

The aim of this work was to provide a first description of the behaviour of diethyl phosphite in organic coatings, description of their physico-mechanical properties as well as anticorrosion properties in the protection of steel substrates. The diethyl phosphite behaviour in the organic coatings depends on the volume concentration of the pigment. A...

Organic coatings containing zinc are amply used for the protection of metals, particularly steel structures. Ways to reduce the zinc content in the coating materials are sought for environmental and financial reasons. Our previous work (Kohl, Prog Org Coat 77:512–517, 2014; Kohl and Kalendová, Mater Sci Forum 818: 171–174, 2015a) suggested that one...

This paper is focused on the heteropoly acids as another new possibility of dopant for conducting polymers which can be used as anticorrosive pigments for steel protection. The newly prepared pigments, silicotungstic and phosphotungstic heteropoly acids, were characterized by determination of oil number and density. The value of critical pigment vo...

Purpose – This paper aims to synthesise anticorrosion pigments containing molybdenum for paints intended for corrosion protection of metals. Design/methodology/approach – The anticorrosion pigments were prepared by high-temperature solid-state synthesis from the appropriate oxides, carbonates and calcium metasilicate. Stoichiometric molybdates and...

The present work was aimed at the synthesis of polyphenylenediamine, its description and determination of parameters whose knowledge is required for the formulation of organic coatings pigmented with this compound. Polyphenylenediamine phosphate was prepared by oxidation polymerization in acidic environment. Phosphoric acid was used as the doping a...

This work is focussed on the properties of organic coatings containing pigments whose surface was chemically coated with zinc ferrite (ZnFe2O4) layer. Four silicate types with different particle shapes were selected as the cores: diatomite, talc, kaolin and wollastonite. The untreated particles exhibit a barrier effect. The aim of this project was...

The aim of this work was to assess the effect of polyaniline salts (PANI-HA) with various dopant types on the mechanical and corrosion properties of organic protective coatings dependent on the pigment volume concentration. The doping acids used included phosphoric acid (H3PO4), sulphuric acid (H2SO4), hydrochloric acid (HCl), p-toluenesulphonic ac...

Mixed metal oxides with the ferrospinel structure ZnFe2O4, Mg0.2Zn0.8Fe2O4 and MgFe2O4 were synthesised by the high-temperature solid-phase process. A series of pigments containing the metals Mg–Zn–Fe was prepared from 4 different starting iron oxides: viz. goethite (FeOOH), hematite (Fe2O3), magnetite (FeO·Fe2O3) and specularite (Fe2O3). The prope...

Purpose – This paper aims to synthesize anticorrosion pigments containing tungsten for paints intended for corrosion protection of metals. Design/methodology/approach – The anticorrosion pigments were prepared by high-temperature, solid-state synthesis from the respective oxides, carbonates and calcium metasilicate. Stoichiometric tungstates and c...

Purpose – The purpose of this paper is to synthesize anticorrosion pigments of the perovskite type, YXO 3 , where X = Ti, Zr, Mn or Al and Y = Ca, Sr, La or Fe, for coating materials intended for corrosion protection of metals. Also, to synthesize pigments containing hexavalent Mo and W (double perovskites). Design/methodology/approach – The antic...

The objective of this paper is the surface modification of silica pigments layer of polyaniline (PANI), poly (p-phenylendiamine) (PPDA) and chemical layer of zinc ferrite ZnFe2O4. This layer promote adhesively-barrier properties of silica particles without surface-treated. This pigment was specified using physico-chemical parameters (oil absorption...

The objective of this paper concerns reducing the zinc metal content in organic coatings while preserving their high mechanical efficiency. The two goals can be achieved by using conductive polymer as components of the protective coating. Polypyrrole (PPy) was investigated as the conductive polymer. PPy was specified using physico-chemical paramete...

A new type of an antimicrobial material based on silver salt (chloride) adsorbed onto 6-carboxycellulose (OC/Ag(I)) was characterized using solid-state carbon-13 cross-polarization-magic angle spinning nuclear magnetic resonance (13C CP/MAS NMR) spectroscopy, flame atomic absorption spectrometry (FAAS), X-ray diffraction (XRD) and size exclusion ch...

Vodivé polymery včetně významného zástupce polyanilinu (PANI) patří v současné době k vysoce zkoumaným látkám v řadě oborů. Díky snadné přípravě, netoxicitě a vysoké stabilitě se zkoumá i jeho využití ve formulaci organických povlaků. Cílem této práce je vyhodnocení vlivu polyanilinových solí na korozní vlastnosti ochranných organických povlaků pom...

The dependence of the corrosion-inhibiting properties of zinc-filled organic coatings on the nature of the conducting polymers and conducting pigments added and on the pigment particles’ surface coating with conducting polymer layers were investigated. The following materials were selected to examine the corrosion-inhibiting properties of the condu...

Herein described the preparation of swelling pearl-like copolymer styrene-4-vinylbenzyl chloride crosslinked by means of tetra(ethylene glycol)-bis(4-vinylbenzyl)ether (200-800 mu m). The pearl-like polymer was used to anchor (1R,2R)-1-amino-2-(2,3-dihydro-1H-isoindole-2-yl)-1,2-diphenylethane by a covalent bond; the product was subsequently transf...

The anticorrosion properties of paints containing mixed metal oxide-based pigments were examined. Spinels with the cation combinations Ti-Zn-Mg or Fe-Zn-Mg were synthesized. Core-shell pigments with zinc oxide and magnesium oxide layers were also prepared. The pigments were synthesized from the oxides or carbonates by the high-temperature solid-pha...

The effect of pigment particle surface treatment with polyaniline and polypyrrole on the corrosion inhibiting properties of organic paints was investigated. Mixed oxides possessing the spinel and perovskite structures were synthesised for the study. Coatings based on an alkyde resin were prepared for the investigation of the corrosion protection pr...

The paper deals with a new anticorrosion pigment, synthesized on a core-shell basis. For its syntheses a starting substance is used that forms the lamellar shaped core; namely lamellar zinc. The cover of the core is represented by zinc oxide, which is in fact partly oxidized lamellar zinc core, and is created during the calcination of the pigment....

The effect of a non-linear oscillator's vibrations (either in solids or in liquids) is the primary source of the amorphous state of the matter. The number of nonlinear oscillators (N.Os.) is considered to be very small at Tg (approximately 2.5%), and rises with the increase in temperature, reaching approximately 100% at the critical temperature Tc....

This paper is focused on the study of low-zinc and/or zinc-free pigments which can be suitable replacement of the most widely used zinc phosphate-based pigments in corrosion protection. The comparison of studied pigments was performed on the basis of corrosion weight looses of steel substrate in the course of accelerated corrosion test. The best re...

The temperature-dependent changes of molecular and sub-molecular motions are studied in amorphous substances. The solid and liquid phases of amorphous bodies are characterized at the micro-level by two types of oscillators, linear and non-linear. It is accepted that an amorphous liquid is formed by domains that group the linear oscillators into the...

Ferrite pigments were synthesized through a high-temperature process during a solid phase. Zinc ferrites were prepared from hematite, goethite, magnetite and specularite entering into reaction with zinc oxide at temperatures ranging from 650 °C up to 1,150 °C. The nature of the initial raw material, primarily the shape of its particles, affects the...

Purpose ‐ The purpose of this paper is to verify the capability of pigmented coatings to mitigate the effects of thermal sensitisation of 430 stainless steel. Design/methodology/approach ‐ Experimental weld joints of non-stabilised ferritic corrosion resistant steel type AISI 430 were prepared. Protective coatings in several variants were applied t...

This paper describes the use of zinc metal nanoparticles <50 nm size (guaranteed by the manufacturer) in protective organic coatings with high zinc metal particle contents. Protective organic coatings with high zinc metal contents are frequently used mainly owing to their high anticorrosive efficiency. The size as well as shape of the zinc metal pa...

This work is focused on study of surface treatment of filler particles with polyaniline (PANI) and the influence on corrosion–inhibition properties in organic coatings. For this reason fillers with non-isometric shape were selected and their efficiency was compared with zinc–aluminum orthophosphate and PANI. The surface of filler particles was cove...

The aim of this paper was to prepare and to compare anticorrosion efficiency of various types of pigments based on phosphates. Their exact composition was defined by X-ray diffraction analysis and their structure by scanning electron microscopy (SEM). Commercially available zinc phosphate was used as a standard. Pigments were prepared in three diff...

The properties of calcined kaolins in paints were identified in relation to their pigment volume concentration (PVC). The study involved three kinds of kaolin exhibiting different development of the lamellar structure of primary particles as well as different distribution of particle size. Kaolins also displayed varying contents of a glassy phase –...

Synthesized strontium titanate researched in the paper appears to be a promising anticorrosion pigment. Nowadays, strontium titanate is prepared from anatase and strontium carbonate by high temperature synthesis. The pigment was researched by means of X-ray diffraction, particle size distribution measurement, scanning electron microscopy, with spec...

The pigments based on mixed metal oxides were synthesized at high temperature. The synthesized pigments XxZnyFe2O4(where X = Ca, Mg, x+y=1) had particles with a lamellar shape. The other type of synthesized ferrite pigments were core-shell anticorrosion pigments where a layer corresponding to the XxZnyFe2O4 composition was applied onto the core – m...

Alumino-silicate coatings and structures formed from alumino-silicate and amorphous chalcogenide submicrometer layers were prepared by pulsed laser deposition. Fabricated thin films were characterized in terms of their structure, morphology, topography, chemical composition, optical properties, and basic anticorrosive functionality. Prepared coatin...

Purpose To study the siccativation effects of metallocenes based on ferrocene and its derivatives as siccatives supporting their catalytic effects during meshing reactions proceeding during the creation of an alkyd resin film. Design/methodology/approach Siccatives are used as catalysts of auto‐oxidation reactions between a binder dried by oxidati...

Work presented deals with the study of cross-linking reactions during the formation of thin films of polyesters modified by unsaturated fatty acids. Cross-linking reactions proceed on alpha-carbon in the vicinity of double bond located at adjacent polyester chain. Hydroperoxides are formed during reaction of air oxygen penetrating into amorphous po...

Purpose The paper aims to investigate the drying effect exhibited by pigments combined with a Co(II) salt of 2‐ethylhexanoic acid (Co(II)) in an alkyd resin modified by soya bean oil. Design/methodology/approach Paint hardening was studied by means of a method that follows the progress of alkyd film drying. Another important method was employed to...

Comparison of properties of diatomite and kaoline in paints were studied in dependence on their volume concentration (PVC). Model paints were prepared containing increasing filler contents, PVC=5% up to the critical volume concentration of the pigment (CPVC). The properties of the prepared coatings were tested by laboratory corrosion tests in both...

The carbonization of nanostructures afforded by conducting polymers represents a new route to the preparation of functional nanostructured carbons. The exposure of colloidal polyaniline particles stabilized with poly(N-vinylpyrrolidone) or silica nanoparticles at 650°C in inert atmosphere led, in both cases, to nitrogen-containing carbonaceous mate...

Talc and muscovite particles were coated with hematite. The aim was to formulate paints with pigments which show the properties of specularite (lamellar hematite) but eliminating the sedimentation of the pigment particles in a liquid environment. Model paints based on epoxy-ester resin were prepared. They were subjected to corrosion and mechanical...

ZnO, ZnO/core, MgO and MgO/core oxides were synthesized; their morphology was evaluated and their impact on the physical properties of the paint film was assessed. The binder used in the studied coatings was epoxy-ester resin. The physico-mechanical properties and the anticorrosion efficiencies of the pigmented paint films were determined. All the...

Polyaniline (PANI) phosphate was synthesised in an aqueous environment containing ammonium peroxodisulfate and phosphoric acid. Polyaniline was characterised by means of scanning electron microscopy. Epoxy ester coatings containing 3–24 vol.-% of PANI as corrosion inhibitor were formulated. The testing of anticorrosion efficiency of PANI as corrosi...

The objective of this work was to identify the anticorrosive efficiency of synthesised, core pigments. Epoxy ester based coatings containing the synthesised pigments were formulated. To test the anticorrosion properties of the coatings, accelerated corrosion tests were carried out in the environment of condensed water, of NaCl mist, and of condensi...

Purpose The purpose of this paper is to clarify the destabilisation mechanism that occurs with two types of ferritic corrosion‐resistant steel during the welding cycle. Design/methodology/approach A series of experimental weld joints was made to verify the actual response of non‐stabilised corrosion‐resistant steel, and of the same steel that had...

Purpose – The purpose of this paper is to synthesize MeO-type pigments, focusing on the oxides containing zinc and magnesium. Design/methodology/approach – Oxides ZnO and MgO were synthesized, their morphology was evaluated, and their impact on the physical properties of the paint film were assessed. A pigment of ZnO/core-shell type also was synthe...

The objective of this work was to identify the anticorrosive efficiency of synthesized, MeO/core pigments and of MeO pigments (MeO = ZnO, MgO) with varied morphology of particles. The synthesized MeO-type pigments displayed varied particle morphologies and the MeO/core core–shell pigments exhibited surface of particles made of zincite and periclase...

Four pigments of various morphology – specularite, α-Fe2O3; goethite, α-FeO(OH); talc, (Mg3(OH)2(Si4O10); and graphite, C – without and with polyaniline phosphate coating, were tested for the anticorrosion performance in coatings produced by epoxy binders on iron plates. The corrosion tests were carried out in a condenser chamber with continuous wa...

The paper deals with research into the effects of treating the surface of pigment particles with polyaniline layers in anticorrosion paints. The pigments involved were tested in a form coated with a polyaniline layer and in an uncoated form. To study anticorrosion properties, mixed metal oxides with the structure of spinel and perovskite were synth...

Polyaniline (PANI) was synthesized by reaction in an aqueous solution of ammonium peroxodisulfate and phosphoric acid. PANI was characterized by means of scanning electron microscopy and its physical–chemical properties were determined. Simultaneously with the synthesized PANI epoxy-ester coatings containing 3, 5, 10, 15, 20 and 24 vol.% of PANI as...

Purpose The purpose of this paper is to synthesize anticorrosion pigments ZnFe 2 O 4 from diverse raw materials of various shapes and size of primary particles. Design/methodology/approach Anticorrosion pigments were synthesized through a high‐temperature process during a solid phase. Zinc ferrites were prepared from hematite ( α ‐Fe 2 O 3 ), goet...

Purpose The purpose of this paper is to describe the process of synthesizing lamellarly‐shaped anticorrosion pigments having a chemically active layer whose core consists of metal aluminium on which a thin spinel film is synthesised. Design/methodology/approach Anticorrosion pigments were synthesised by reaction of metal aluminium lamellar particl...

Polyaniline (PANI) was synthesized by chemical oxidative polymerization in laboratory conditions. The main objective was to study the properties of organic coatings containing PANI and PANI in combination with other anti-corrosive pigments. The adhesion, barrier, and anti-corrosion properties of the coatings containing PANI and selected chemically...

Anticorrosion pigments were synthesized by reaction of metal aluminum lamellar particles whose surface is oxidized to Al2O3 during the first stage and by subsequent reaction with ZnO and/or MgO at 800–1150 °C producing a thin spinel layer that is chemically bonded to the metal core of the pigment particles. Core–shell spinels were synthesized: MgAl...

Purpose The purpose of this paper is to synthesise glassy and crystalline Ca‐Zn and Sr‐Zn borophosphates. Design/methodology/approach Anticorrosion pigments on the basis of glassy and crystalline borophosphates formulated as 20CaO‐30ZnO‐20B 2 O 3 ‐30P 2 O 5 and 20SrO‐30ZnO‐20B 2 O 3 ‐30P 2 O 5 were synthesised. The pigments prepared were character...

Purpose To synthesise anticorrosion pigments of a lamellar and core‐shell type based on Zn, Ca and Mg ferrites for metal protecting paints. Design/methodology/approach The anticorrosion pigments were synthesised from oxides or carbonates at high temperature. The pigments synthesised had particles with a pronounced lamellar‐tubular shape consisting...

Zinc sulfide (ZnS) nanoparticles were prepared by homogeneous hydrolysis of zinc sulfate and thioacetamide (TAA) at 80 degrees C. After annealing at a temperature above 400 degrees C in oxygen atmosphere, zinc oxide (ZnO) nanoparticles were obtained. The ZnS and ZnO nanoparticles were characterized by X-ray diffraction (XRD), scanning electron micr...

Purpose To synthesise calcium titanate with a perovskite structure as an anticorrosion pigment for metal protecting paints. Design/methodology/approach Calcium titanate was synthesised from titanium dioxide and calcium carbonate at high temperature. The pigment obtained was characterised by means of X‐ray diffraction, particle size distribution me...

Zinc sulphide (ZnS) nanoparticles were prepared by homogeneous hydrolysis of zinc sulphate and thioacetamide (TAA) at 80 1C. After annealing at temperature above 400 1C in oxygen atmosphere, zinc oxide (ZnO) nanoparticles were obtained. The ZnS and ZnO nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM),...

The presented paper is devoted to pigments of various chemical compositions and particles morphology surface-modified by polyaniline layer as corrosion inhibitors to coatings. They were synthetized of pigments on the spinel base, ferrites with contents of Zn, Mg and Ca cations with isometric and nonisometric forms of primary particles. These pigmen...

Various particles based on zincite and periclase were prepared by thermal methods. In dependence on starting compounds, particles varying in shape and size were obtained. Synthesized particles were identified and determined by X-ray diffraction and Scanning Electron Microscope (SEM). Morphologically interesting particles of ZnO, MgO and ZnO, MgO la...

Nanocrystalline mixed oxides of Ti, Zn, Al and Fe were prepared by a homogeneous hydrolysis of sulphates with urea at temperature of 100 °C in an aqueous solution. The prepared samples were characterized by BET and BJH measurements, an X-ray powder diffraction and scanning electron microscopy. These oxides were taken for an experimental evaluation...

This paper deals with study of anticorrosive coatings containing metallic pigments. Thirty-three epoxy resin-based coatings and 15 silicone resin-based coatings, differing in content and kind of metallic and non-metallic pigments were prepared. The efficiencies of these systems were evaluated on the basis of physical–mechanical properties and corro...

The problem of environmental protection set strict limits for the use of toxic pigments (e.g., lead, cadmium and other heavy metals). At present, a new generation of pigments called environmental friendly is looked for elimination of these heavy metals. The aim of this work was preparation of different kinds of zinc oxide by various methods, the ch...

This work deals with the study of anticorrosive efficiency of coatings containing a combination of zinc dust and non-metallic pigments. Eight non-metallic anticorrosive pigments combined with zinc dust VM 4P16 were used. For each combination of pigments were prepared three or four types of epoxyester coatings with different pigment volume concentra...

Purpose This paper seeks to synthesize needle‐shaped anticorrosion pigments based on the ferrites of Zn, Ca and Mg for metal protecting paints. Design/methodology/approach Anticorrosion pigments were synthesized from oxides or carbonates at hot temperatures. The following pigments were synthesized: ZnFe 2 O 4 , MgFe 2 O 4 , CaFe 2 O 4 , Mg 0.2 Zn...

Purpose – The purpose of this paper is to synthesise X2TiO4 spinel-type anticorrosion pigments and YTiO3, perovskite-type anticorrosion pigments, where X = Zn, Mg, Ca, Sr; Y = Ca for metal protective paints. Design/methodology/approach – Anticorrosion pigments were synthesised from oxides or carbonates at high temperature. The following pigments we...

This paper deals with the study of properties of anticorrosion pigments of varying chemical composition in epoxyester paints. Two type lines of paints were prepared. The first line comprised an anticorrosion pigment with a PVC concentration of 10% while the other line comprised an anticorrosion pigment with a PVC concentration = CPVC. The following...

Purpose To identify the dependence of the anticorrosion efficiency of chemically varying pigments on their concentration in steel protecting paints. Design/methodology/approach Anticorrosion pigments from a group of nontoxic substances were chosen and compared with a chromate pigment. With all pigments, the following parameters were observed namel...

Purpose To identify a method of evaluation as well as conditions under which corrosion in the form of flash rusting attacks steel treated with a coating of water‐borne binders. Design/methodology/approach The paper worked with soluble alkaline silicates – sodium silicate – acting as flash rusting inhibitors, while aqueous dispersion binders were u...