The article is devoted to the comparative analysis of wear-resistant protective coating of sliders in valves designed for operation at facilities of the Transneft system's companies. We have considered slide valve failures that occurred due to violated integrity of the slider coating; we have examined the results of scientific research conducted in the field of wear-resistant protective coatings. Criteria are presented for assessing the quality of wear-resistant protective coatings of valve sliders and identified the factors affecting protective coatings and influencing coating failures. We have generalized the results of work aimed at improving the quality of wear-resistant protective coatings of valve sliders and we have stated the requirements for such coatings, as well as the methods of control, inspection, and testing in order to confirm the quality of coatings. As part of work to improve the quality of wear-resistant protective coatings of valve sliders, we have studied and tested ion-plasma spraying with titanium nitride (Ti-TiN);ion-plasma spraying with chromium carbide (Cr – CrC); chemical nickel coating (Ni + CrC); electroplated chrome coating (Cr); flame spraying with tungsten carbide (WC). Following our work, we have summarized, generalized, and analyzed the results of comparative tests of protective properties, which have shown that all types of coatings meet the requirements for protective properties of Transneft. The work was carried out in order to improve the method of producing a wear-resistant coating for sliders and to enhance the coating quality indicators, including on non-working surfaces of sliders, the requirements for which had not been previously regulated in the serial manufacture of sliders for slide valves.
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