Using of rust converters for deposition of anti-corrosion coatings

This work is devoted to the study of phosphate coatings formed on the surface of iron samples from Tzinkar rust converter solutions manufactured in industry. The optimal conditions for the deposition of anticorrosion coatings from a solution of the Tzinkar rust converter in the presence of accelerators of nitrophenol, sodium m-nitrobenzosulfonate and hydroxylamine are determined. It was shown that the coatings deposited from Tzinkar the presence of an accelerator of sodium m-nitrobenzosulfonate with a concentration of 5 g/l at a deposition temperature of 40 degrees C and a deposition time of 10 min had the highest corrosion resistance. The corrosion resistance of such coatings is 180 s according to the Akimov method, while the corrosion resistance of coatings deposited from the phosphating solution FR under the same conditions is 25 s. The study of deposited anticorrosion coatings from Tzinkar solution was carried out using the EM method with OLYMPUS LEXTOLS 4100 microscope. The thickness of the coatings was determined using a thickness gauge of galvanic coatings Constant K6C. Coating strength was determined on a PosiTestAT. It was shown that the addition of 0.5 g/l m-nitrobenzosulfonate to the Tzinkar solution promotes the formation of a uniform fine-crystalline coating with the smallest thickness of 5.2 mu m and the highest adhesion of 3.7 MPa with the surface of the iron sample in comparison with other accelerators. (C) 2020 Elsevier Ltd. All rights reserved.