ASSESSMENT OF THE INFLUENCE OF EXTERNAL FACTORS ON THE CORROSION RESISTANCE AND WEAR RESISTANCE OF ZINC COATINGS ON STEEL
DOI:
https://doi.org/10.18372/0370-2197.4(105).19387Keywords:
friction, coating,, wear, abrasive, corrosion, microhardness, testing, oxidationAbstract
The aim of the study was to investigate the intensity of corrosion processes in zinc coatings in aggressive and non-aggressive environments and to determine the resistance of zinc coatings to free abrasive attack. The protective properties of zinc coating on metal surfaces, its service life depending on the coating thickness and operating conditions are analyzed. The features of the technological process of anticorrosive protection of metal structures by hot-dip galvanizing are presented. The intensity of corrosion processes in zinc coatings in aggressive and non-aggressive environments is investigated. Intensive destruction of the coating in citric acid solution and gradual oxidation of the coating with the formation of white rust in water and NaCl solution were found. The results of zinc coating wear in an abrasive environment are presented and the influence of external factors and abrasive on the microhardness of the coating is analyzed. The results of the abrasive wear studies in a free, non-rigidly fixed abrasive revealed an increase in weight wear by 1.16, 1.25, 1.3 and 1.62 times for samples after 30-day exposure in soil, distilled water, NaCl and citric acid solutions, respectively, compared to the wear indicators for the sample that was indoors. An increase in microhardness on the friction track was found for all samples, except for the sample exposed to soil. An increase in microhardness on the friction track was found for all samples except the sample kept in soil. It is assumed that the kinetics of changes in the microhardness of the surface layers of the friction raceway depends on the wear rate of individual intermetallic phases of the zinc coating.
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