Effect of an organic binder protective coating on the corrosion resistance of steel

The development of methods and techniques for protecting the surfaces of steel structure exposed to aggressive environments, e.g. sea water, presents itself as an urgent task in material science. One of the directions in solving these problems involves the application of paints and enamels based on organic binders. The promising aspects of this direction are due to the possibilities of creating compositions by varying the physicochemical properties and colloidal chemical qualities of the components – film formers, binders, pigments and fillers. In this study, properties of protective coatings based on acrylic latex are examined together with their dependency on anti-corrosion additives and pigments using the corrosion test methods described in a number of state standards. In the corrosion test programme, an EDX-800HS X-ray spectrometer (Shimadzu, Japan), ShS 80-01 SPU oven and an HR-150AZ analytical balance with weighing accuracy up to ±0.0001 g were applied in conjunction with a number of other modern instruments. The application of acrylic latex based on butyl acrylate ester monomers and styrene as a protective coating was proved to be ineffective in the case of metal surfaces subjected to aggressive action. The work provides the compositions optimal in terms of chemical formula, dispersion and quantitative ratios and possible to significantly increase the protective ability of anticorrosion coatings. The addition of a pigment based on zinc phosphate and sodium nitrite as an anti-corrosion additive to the composition of the Rzhavostop acrylic enamel significantly increases the protective properties of the composition. The enamel-coated samples of St3 steel exhibit no signs of corrosion for up to 2–3 days of maintaining in model solutions of sea water. The enrichment of Rzhavostop acrylic enamel with black pigment with at least 95 % of 3-di(2-hydroxyethylamino) propionic acid 2-ethylhexyl ester greatly enhances the effect of the film former adhering to the metal surface. The addition of zinc tetraoxychromate complements the effect and prevents corrosion from spreading over the surface. In 7–8 days, no signs of corrosion were detected in St3 steel samples of under the considered conditions.

The authors declare no conflict of interests regarding the publication of this article.

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