Abstract
Influences of Ni and Ru on corrosion resistance of Ti-0.5%Ni-0.05%Ru (Grade13) were investigated. Study on its microstructure indicates that Ni precipitates in α-Ti matrix as an intermetallic Ti2Ni and Ru is detected intensively in the Ti2Ni. When Ti2Ni or Ti2Ni-Ru electrodes were connected to commercially pure titanium (C.P.Ti) which was corroded in 5%HCl solutions, they raised the potential of C.P.Ti up to a passivation potential and thus prevented the corrosion by means of promoting an cathodic reaction on their surfaces. Ru in Ti2Ni was confirmed to increase its corrosion resistance and to promote an cathodic reaction to larger extent than Ti2Ni itself does, by which Grade13 indicated passivation in concentrated HCl solutions.
