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The composition, structure, and protective and hydrophobic properties of nanoscale films formed layer-by-layer in solutions of sodium dodecylphosphonate (SDDP) and vinyltrimethoxysilane or n-octyltriethoxysilane (OTES) on the zinc surface with different morphologies were studied by SEM, XPS, water contact angle measurements, and electrochemical and...
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Context 1
... with this, an important requirement for the developed methods of anticorrosion protection and the substances used for this is their environmental and technological safety. This can be achieved using non-toxic organic corrosion inhibitors (OCIs) (Appendix A: Table A1), whose molecules form self-assembled monolayers (SAMs) on the metal surfaces. These OCIs include higher phosphonic and carboxylic acids, thiols, and trialkoxysilanes. ...Context 2
... results of measuring the roughness parameters of zinc surface types studied in this work by the profilometric method are presented in Table 1 and Figure 1. The "smooth" air-oxidized zinc surface (Type 1) corresponds to the third roughness class [48]. ...Similar publications
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Citations
... We recently suggested a method for preparing thin protective films on zinc and galvanized steel, based on their layer-by-layer treatment in aqueous solutions of sodium dodecylphosphonate (C 12 PNa) and trialkoxysilanes [9][10][11][12]. Despite the high efficiency of the suggested method for the anticorrosion protection of zinc in various corrosive atmospheres, there are additional opportunities to improve the protective properties of such phosphonate-siloxane films. ...
... Another important factor influencing the protective and hydrophobic properties of alkylphosphonate films is the initial state of the metal surface, including its morphology, the presence or absence of an oxide film and its composition [1,11,14]. Changing the initial state of the metal surface makes it possible to enhance the hydrophobic and protective properties of thin films. Among the many methods for modifying the surface of metals, laser treatment (LT) is widely used by researchers [18,19]. ...
... It allows to preparing a multimodal roughness of the metal surface, change the chemical composition and structure of the surface layer, which are necessary for its successful superhydrophobization in solutions of CIs. As we have recently shown, preliminary LT of zinc and galvanized steel makes it possible to prepare protective films on their surface with superhydrophobic properties upon two-stage passivation in solutions of C 12 PNa and vinyltrimethoxysilane or octyltriethoxysilane (OTES) [10][11][12]. An important advantage of the suggested method of anticorrosion protection of zinc and galvanized steel from atmospheric corrosion is the use of aqueous solutions of nontoxic СIs, or containing no more than 9.5 vol.% ethanol. ...
Effect of the solvent nature in solutions of alkylphosphonic acids (CnPs), as well as the structure of their molecules, namely the alkyl length (nc), on the protective and hydrophobic properties of films formed upon layer-by-layer passivation together with octyltrimethoxysilane (OTES) on a zinc surface with different morphologies was studied. The paper presents the results of the study by scanning electron microscopy, profilometry, contact angle measurements and accelerated corrosion tests in atmospheres of high humidity and salt spray. It was shown that zinc passivation in ethanol solutions of dodecylphosphonic acid is more effective than in aqueous solutions of its sodium salt, both when they are used individually and upon two-stage passivation together with OTES. The inhibiting properties of CnPs with nc=12, 16, 18 in relation to zinc increase with increasing their nc, including when they are used together with OTES. Preliminary laser treatment of the zinc surface enhances the hydrophobic and protective properties of thin phosphonate–siloxane films formed. Layer-by-layer passivation of laser textured zinc surface at a low scanning speed in ethanol solutions of octadecylphosphonic acid and OTES is most effective for its anticorrosion protection in atmospheres of different corrosivity.
... In order to superhydrophobization of zinc, various methods are used to create multimodal morphology of the metal surface, for example, electroplating, plasma and chemical etching, hydrothermal method, laser treatment [10][11][12][13][14][15][16][17]. Among them, laser treatment is especially worth noting, which allows to change the structure and properties of the surface layer of metals in a wide range to enhance their corrosion resistance, wear resistance and for the superhydrophobization of their surface [17][18][19][20][21][22]. In this regard, laser modification of the surface of metals and alloys is widely used for processing parts and critical structural units in various industries [23]. ...
... In this regard, we recently demonstrated this possibility on zinc and galvanized steel for corrosion protection under atmospheric conditions [17,21,22,[41][42][43]. These works propose an environmentally and technologically safe method for superhydrophobization of zinc and galvanized steel, which consists of laser texturing of their surfaces followed by treatment in solutions of alkylphosphonic acids, including in combination with trialkoxysilanes. ...
... Cooled zinc samples were treated in 1.0 mM ODPA ethanol solution at 40°C for 2 h and then dried at 60°C for 1 h. This method of obtaining nanoscale SHP protective films on the zinc surface using laser and heat treatments followed by passivation with alkylphosphonate CIs was first proposed by us earlier in [17,21,22]. These works demonstrated the high anticorrosion efficiency of such films for protecting zinc and galvanized steel against atmospheric corrosion. ...
A new combined method of anticorrosion zinc protection in NaCl solutions, which involves the superhydrophobization of its surface and addition of small amounts (1.0 mM) of corrosion inhibitors (CIs) to the corrosive media was suggested. According to corrosion tests and contactangle measurements (c), the CIsstudied, differing in chemical nature and mechanism of action, are arranged in the following sequence according to their efficiency in zinc protection in 1.0 mM NaCl using the combined method: zinc aminotris(methylenephosphonate) (ATPZn) > CeCl3 > Ce(NO3)3 > cerium aminotris(methylenephosphonate) (ATPСе) > Na2B4O7 > sodium dodecylphosphonate > Zn(H2PO4)2 = NaNO2 > sodium meta-nitrobenzoate. According to electrochemical tests, the mechanisms of inhibitive action of CIs that have shown high efficiency in protection of zinc coated with a SHP alkylphosphonate film, namely CeCl3, Ce(NO3)3 and ATPZn, differ. At the concentration studied, CeCl3 is a cathodic inhibitor, Ce(NO3)3 is an anodic inhibitor, while ATPZn acts as mixed type inhibitor, which determines its greatest efficiency. The suggested combined method of zinc protection was proven to be highly effective. Thus, the addition of 1.0 mM ATPZn to 1.0 mM NaCl solution prevents the degradation of the SHP film on zinc and increases its corrosion resistance significantly, ensuring the absence of visible corrosion damage and c150°C for 72 days.
