Two-Stage Passivation of Zinc by Solutions of Sodium Dodecylphosphonate and Trialkoxysilanes

Redkina, G.V.; Sergienko, A. S.; Kuznetsov, Yuri A.

doi:10.1134/s2070205121070157

Cited by 3 publications

(9 citation statements)

References 21 publications

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“…The results of corrosion tests in heat and moisture and salt spray chambers showed that films obtained on laser textured zinc surfaces (Types 3 and 4) during layer-by-layer passivation in solutions of SDDP and TASs significantly superior in protective properties of films formed on etched or “smooth” surfaces (Types 2 and 1) ( Figure 3 , Table 4 ). The inhibiting efficiency of the latter was studied by us earlier in [ 34 ]. Sequential passivation with SDDP and TAS is more effective than with individual OCIs.…”

Section: Resultsmentioning

confidence: 99%

“…The duration of exposure in each solution was 1 h with intermediate drying at 60 °C for 30 min. We previously determined these conditions of the zinc passivation with SDDP and TAS as optimal in terms of the efficiency of anticorrosion protection [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

“…An enhancement of the anticorrosive properties of phosphonate films obtained on zinc in aqueous solution of SDDP by TASs of various structures, as well as some regularities in the formation of such thin phosphonate–siloxane films, were established by us in [ 34 ]. The advantage of layer-by-layer treatment with these OCIs over passivation in the aqueous solution of their mixture was shown, as well as the effect of the nature of TAS on the sequence of films formation and their protective properties.…”

Section: Introductionmentioning

confidence: 99%

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Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology

et al. 2022

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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 corrosion tests. The protective, hydrophobic properties of phosphonate–siloxane films on zinc and their stability in a corrosive media are determined both by the initial surface morphology and composition of the surface oxide layer, and by the nature of inhibitors. It was shown that preliminary laser texturing of the zinc surface is preferable than chemical etching to enhance the anticorrosive properties of the resulting thin films. The most stable films with excellent superhydrophobic and protective properties in atmospheres of high humidity and salt spray are formed on the zinc surface with fractal morphology during layer-by-layer passivation with SDDP and OTES.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology

et al. 2022

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“…The initiation of hydrolysis and polycondensation processes near the electrode surface is associated with the accumulation of charged particles of reagents and alkaline catalysis as a result of the electrolysis of water molecules [ 30 , 31 , 32 , 33 , 37 , 39 ]. For zinc coatings, such additives can be derivatives of phosphonic and carboxylic acids, multifunctional organosilanes and azoles and their substituted forms [ 5 , 7 , 28 , 29 , 35 ].…”

Section: Discussionmentioning

confidence: 99%

“…To protect zinc or zinc coatings on steel from corrosion, adsorption-type corrosion inhibitors are the most effective. Among organic zinc corrosion inhibitors in aqueous solutions, carboxylates [ 1 , 2 , 3 , 4 ], azoles and their substituted forms [ 5 , 6 , 7 , 8 , 9 ], molybdates [ 10 , 11 ], alkylphosphonic acids [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] and organosilanes [ 19 , 20 , 21 ] are currently known. Their inhibitory effect is often explained by the formation of a thin protective layer on the metal surface due to chemisorption or the formation of complex compounds with Zn 2+ cations [ 5 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Formation of Composite Coatings on Galvanized Steel from Organosilane Solutions Using Electrophoresis and Sol–Gel Technology

et al. 2022

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New hybrid composite coatings (HCCs) on hot-dip galvanized steel (HDGS) were obtained using electrophoresis (cathodic polarization (CP)) and sol–gel technology. For this purpose, a technique for the preparation of a cationic precursor based on TiCl4 and aminopropyltriethoxysilane was developed. Electrophoresis of the charged particles of the precursor and organosilanes promotes the production of denser sol–gel coatings with improved adhesion. Using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) methods, the formation mechanism and protective properties of HCC on galvanized steel were investigated.

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Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

Kuznetsov

Redkina

2022

Coatings

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Protection of metals in neutral media with pH 5.0–9.0 (in humid atmospheres and various aqueous solutions) can be achieved by formation of thin coatings (up to several tens of nm) on their surfaces due to adsorption and more complex chemical interactions of organic corrosion inhibitors (OCIs) with the metal to be protected. The review contains three sections. The first section deals with coatings formed in aqueous solutions, while the second one, with those formed in organic and water-organic solvents. Here we consider metal protection by coatings mainly formed by the best-known classes of OCI (carboxylates, organophosphates and phosphonates) and estimation of its efficiency. The third section discusses the peculiarities of protection of metals in the vapor-gas phase, i.e., by volatile OCIs, and a relatively new type of metal protection against atmospheric corrosion by the so-called chamber inhibitors. OCIs with relatively low volatility under normal conditions can be used as chamber OCIs. To obtain a protective coating on the surfaces of metal items, they are placed in a chamber inside which an increased concentration of vapors of a chamber OCI is maintained by increasing the temperature. This review mainly focuses on the protection of iron, steels, copper and zinc.

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Two-Stage Passivation of Zinc by Solutions of Sodium Dodecylphosphonate and Trialkoxysilanes

Cited by 3 publications

References 21 publications

Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology

Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology

Formation of Composite Coatings on Galvanized Steel from Organosilane Solutions Using Electrophoresis and Sol–Gel Technology

Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

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