Аңдатпа
This paper presents the results of a study of the microhardness and corrosion resistance of a number of protective coatings applied to the surface of D16 alloy products. Various protective coatings (chromium, chromium nitrite, and a chromium nitrite layer with a chromium layer deposited on top) are proposed, each with varying degrees of Vickers microhardness (from HV = 80 to HV = 1114) and corrosion resistance. A chromium layer deposited on the surface of D16 alloy is shown to have very low hardness (HV = 80). A chromium nitrite layer deposited on the surface of D16 alloy is determined to have high hardness (HV = 655), but very low corrosion resistance. A double protective coating consisting of a chromium nitrite layer deposited on top of a chromium layer is shown to have satisfactory hardness (HV = 236) and corrosion resistance. It was found that the introduction of a highly hard layer between the surface of a D16 alloy part and an external chromium layer exceeds the surface hardness of the D16 alloy parts several times. It was shown that treating protective chromium-containing coatings with active oxygen species significantly increases the corrosion resistance and hardness of these coatings.