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Polyaniline (PANI) and polyaniline composites with aluminium oxide (Al 2 O 3) were prepared using the in situ polymerization method. The composites were then blended with acrylic paint and applied to carbon steel panels. The coated steel panels were evaluated for corrosion using the immersion test technique. The results revealed that the steel pane...
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... 2 O 3 , the spectrum, the composites have been shown to contain all the main characteristics of the PANI bands, except for C-H peak at 1105.5 cm -1 ; these peaks are found to be slightly shifted to be at 1108.5 cm -1 as compared to pure PANI, indicating significant interactions between polyaniline and Al 2 O 3 (Teoh et al., 2007), as depicted in Fig. ...
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In this paper, a composite from polyaniline and graphene oxide-hydrotalcite hybrid (PAN-HG) was fabricated by direct polymerization of aniline using ammonium persulphate as an oxidant in the presence of a HG hybrid. The structure and morphological properties of synthesized PAN-HG composites were characterized by Fourier transform infrared (FTIR) sp...
Citations
... Because of its low electrical conductivity, excellent resistance to wear and corrosion, and ease of usage, epoxy coating is used in structural applications [2]. Nevertheless, the hydrophilic nature of epoxy degrades the coating; therefore, the coating may not withstand harsh service environments such as saltwater corrosion, marine corrosion, and wear [3,4]. Second-phase nanoparticle development has been used to address this problem. ...
The distribution of nanoparticles in the production of epoxy coating results in particle clustering and agglomeration. In this work, biosynthesis of silver nanoparticles was used to modify maize cob ash nanoparticles to avoid particle clusters. The stir-air spray method was to developed composite coating of 0, 2, 4, 6, 8, and 10 wt% nano-maize cob ash modified with 0.5 wt% AgNPs. The microstructure, adhesion strength, wear, and thermal behavior of the coating were investigated. Optimal properties were obtained at 0.5 wt% silver nanoparticles modified with 8 wt% nano-maize cob ash with 84.26% thermal properties, higher wear resistance, a lower coefficient of friction with deep cuts, less plastic deformation, and fewer wear grooves. It is established that low-cost biosynthesis of silver nanoparticles can be used to improve the distribution of nano-maize cob ash for the polymer coating of mild steel.
... Failure of equipment due to corrosion is a main problem in the chemical and petrochemical industry. Mild steel is still the Coating is one of the methods of corrosion control and epoxy coating represent the most important engineered polymers that drawn attention due to its wide applications including structural materials, tissue substitutes [1], anti-corrosion coatings [2] and flame retardant additives [3]. In material science, the combination of an organic phase (generally polymers) with inorganic particles has gained significant attention. ...
Corrosion rates of mild steel in different aqueous solutions at different operating conditions were studied by weight loss technique in the absence and presence of epoxy coating. It was found that corrosion rates increased with temperature and salt concentration and decreased with pH values. Presence of coating reduces the corrosion rates to significant values in acidic solutions. The performance of the coating was poor in saline solution. A magnesium oxide (MgO) nanoparticle was prepared via sol-gel method and the diagnosis was carried out by XRD technique. Maximum coating efficiency was 97% in acidic solution, while the lower one was 29.8% in saline solution in absence of nanoparticles. Nano scale MgO was used effectively with epoxy coating in saline solutions and improve the coating performance with maximum value of 93.7%. SEM test was also used to study the surface morphology. Several mathematical models were suggested to correlate the operating condition with corrosion rate. Polynomial interaction effect model was suitable to represent the data with a high correlation coefficient. © 2018 Brazilian Metallurgical, Materials and Mining Association.
... The incorporation of metal containing particles in electroconductive polymers gave solution to some of the limitations of PANI by providing synergistic chemical and physical properties [7] [8] [9] [10] [11]. Recently, PANI composite with metal particles exhibited many applications with enhanced performance as chemical and biological sensors [12] [13], microelectronic devices [14], electrocatalysts [15] [16], electromagnetic shielders [17], energy storage devices [18] and corrosion protectors [19]. The morphology, crystallinity and dopants of electroconductive polyaniline composites are important factors that have imperative effect on their characteristics and performance [18,20–22]. ...
The majority of metals, when exposed to the atmosphere, react with their surroundings to produce stable metallic chemical compounds in the form of oxides, carbides, and sulphides. Even though technological developments have occurred in various fields, such as corrosion prevention, more than 3.6% of the global gross domestic product (GDP) is affected and thus wasted. Nano-coating technologies are showing positive signs in corrosion protection due to their simplicity of maintenance, less expensive, and applicability to metallic substrates. It has been widely used to protect metallic compounds in automotive, aerospace, food, and biomedical metallic implants. Rather than micron-scale sizes, ceramic material coatings at nanoscale levels are gaining popularity through dense, uniform, and robust thin metal oxide coatings acting as effective corrosion barriers. Additionally, these coatings improve metallic substrates' hardness, wear resistance, and thermal properties. This review article primarily focuses on the characteristics of nano-sized ceramic material coatings over the metallic substrate with particles of Al2O3, Ta2O5, ZrO2, TiO2, and Nb2O5. A review of the properties of nano-sized ceramic material coatings, dispersion mechanisms, different coating technologies, applications, benefits, and challenges is also addressed.
Solubility problem of composite in aqueous medium is resolved on adding Al2O3 during the oxidative polymerization of aniline using ammonium peroxydisulphate as an oxidant and sodium salt of dodecyl bezenesulphonic acid as surfactant and dopant at 273 K temperature. The yielded water soluble Al2O3-PANI composite is confirmed by comparing the FTIR, XRD and SEM recorded spectra with previously reported one. Gravimetric method exposes that the prepared composite is having confrontation against corrosion. Only a slight change in efficiency on continuous exposure up to eight hours is observed. OCP data are transformed in to potential graph to exposes the invincibility of the composite against corrosion. Measurement of potentiodynamic polarization and EIS studies also confirms the defiance against corrosion. © 2018 Oriental Scientific Publishing Company. All Rights Reserved.
Present study focuses on the development of composite coating for corrosion protection of mild steel in marine environment. In the present work, in-situ chemical oxidative polymerization process is employed to synthesize poly(aniline-anisidine)/chitosan/SiO2 composite in aqueous medium of chitosan. The synthesized copolymer composites were characterized by FTIR, XRD, TGA, and SEM. Corrosion resistant coatings were developed by loading of the copolymer composites in the epoxy resin. Electrochemical behavior of coatings was studied in 3.5% NaCl for a span of 20 days. The electrochemical measurements have clearly demonstrated excellent improvement in the corrosion resistant properties of the substrate after application of coatings. Salt spray test (as per ASTM B117 standards) revealed that the composite coatings can withstand under accelerated corrosion conditions of high salt content and humidity for prolong periods. The improved corrosion resistance of the composite coatings is attributed to the effective combination of fillers (SiO2 nanoparticles), biopolymer (chitosan) in conducting matrix (poly(aniline-anisidine)).
A copolymer of aniline (AN) and N-ethylaniline (EA), namely Poly(AN-co-EA) and its composite with ZnO nanocomposites, Poly(AN-co-EA)/ZnO were synthesized by chemical oxidative polymerization using ammonium persulphate as an oxidant. The synthesized compounds were characterized by FTIR, XRD, SEM and electrical conductivity techniques. The synthesized compounds were dissolved in N-methyl-2-pyrrolidone (NMP) and were casted on mild steel (MS) specimens using 10 % epoxy resin as a binder. The adhesion properties of the copolymer and nanocomposite coatings were also tested. The anticorrosion behaviour of coated MS was investigated in 0.1 M HCl, 5 % NaCl solution, distilled water and open atmosphere by performing immersion test, open-circuit potential measurements, potentiodynamic polarization measurements, electrochemical impedance spectroscopy and atmospheric exposure test. Surface morphology of the coated steel prior to and after 30 days immersion in corrosive solution was evaluated using SEM. The nanocomposite coating showed excellent protection against MS corrosion; the protection efficiency (PE) varied in the range of 89–96 % after 30 days of immersion. The incorporation of ZnO nanoparticles improved the anticorrosion properties of Poly(AN-co-EA) copolymer in all corrosion media subjected to investigation.
The modification of silicon dioxide surface via polyaniline (PANI) prepared by in-situ polymerization method. PANI and PANI-SiO 2 were characterized using Fourier transform infrared; X-ray diffraction and digital multimeter was used to measure conductivities for samples. Morphology of the synthesized PANI and PANI-SiO 2, were examined using scanning electron microscopy. Samples were then used as pigments through blended with acrylic paint and applied on the surface of carbon steel panels. Corrosion was evaluated for coating of carbon steel panels through; full immersion test, salt spray test and adhesion test up to standards; ASTMG 31, ASTM B117 and ASTM D3359 respectively. Corrosion rate and coating adhesion were calculated after finished exposed periods in acidic Medias. Digital camera also used for monitored corrosion visually on the surface of carbon steel specimens. The results revealed that acrylic paint pigmented by SiO 2 modified by polyaniline, more efficiently in corrosion protection for carbon steel than each of PANI and SiO 2.
