Study of the Process of Formation of Corrosion-Resistant Coatings of the Ti–Cu–N System Obtained by the Vacuum Arc Deposition Method for Medical Products
摘要
Coatings based on the Ti–Cu–N system were obtained from separated plasma flows by vacuum-arc deposition. The effect of reaction gas pressure on the electrochemical behavior of coatings has been studied. The study of the relationship between the elemental, phase composition of Ti–Cu–N coatings and their electrochemical characteristics showed that coatings with a copper concentration of 4–7 at % in their composition are characterized by low values of the anodic dissolution current density, which is due to the corrosion resistance of copper located along the grain boundaries of titanium nitride. Increasing the copper content to 12 at % leads to the formation of a two-phase coating based on Ti2N and СuN3, which, as a result, reduces its corrosion resistance. The study of the corrosion resistance of the multilayer TiN/TiCu (7 at %)N/TiN/TiCu(7 at %)N coatings showed that layer-by-layer deposition makes it possible to reduce the current density of the anodic dissolution of the multilayer coating by a factor of four compared to the single-layer TiCu(7 at %)N, which is due to the increased length of interphase boundaries, a decrease in porosity, and structural heterogeneity.