THE EFFECTS OF TI IMPLANTATION ON CORROSION AND ADHESION OF TIN-COATED STAINLESS-STEEL

Thin titanium nitride (TiN) films of 40 and 70 nm in thickness were de posited on austenitic-type 304 stainless steel substrates by a rf ion plating process, and these specimens were irradiated with 70 kV titani um ions at a fluence of 1 x 10(17)/cm2 by use of MEVVA IV metallic ion source at room temperature. After that TiN films of 2 mum were deposi ted by the same method. The results of X-ray photoelectron spectroscop y and Auger electron spectroscopy revealed that implanted titanium pen etrated into the substrate and interfacial mixing was verified. The ad hesion strength was estimated by a scratch test. It was found that ion implantation can enhance the adhesion strength between the film and t he substrate. The corrosion resistance of the specimens was evaluated in aqueous solutions of sulfuric acid by an electrochemical method. Ti tanium implantation was extremely effective in suppressing the anodic dissolution of stainless steel.