Corrosion properties of Pt coatings by double glow plasma

摘要

The deposition of platinum coatings by double glow plasma technique on titanium alloy substrates at different gas pressures is reported. The corrosion properties of platinum coatings were investigated. The coating deposited at gas pressures of 20 and 30 Pa had a preferred (220) orientation due to the initial nuclei with preferred growth on the surface of the substrate. The coating deposited at gas pressure of 25 Pa showed no evidence of preferential orientation. The platinum coatings showed better corrosion resistance than the titanium alloy. The electrochemical properties of the platinum coatings deposited at different gas pressures had some difference because the porosity in the coating increased with increasing gas pressure.