Abstract
Corrosion characteristics of the open surface of a Ti-Pd(0.14) alloy have been studied in NaCl-HCl solutions of various concentrations. It has been confirmed that the Ti-Pd alloy shows markedly lower corrosion rates and improved corrosion resistance in comparison with pure titanium in these environments. The electrochemical behavior of the Ti-Pd alloy in these solutions suggests that palladium accumulates on the surface of the Ti-Pd alloy during the initial period of corrosion, the accumulation of palladium on the alloy surface being confirmed by GDS analysis. The corrosion protection is explained by the fact that a palladium enrichment on the surface accelerates the cathodic reaction due to lowering the hydrogen overvoltage, and consequently, shifts the corrosion potential of the alloy into the passive region of titanium. Therefore, the corrosion potential of the alloy is more noble than the critical potential for passivity of titanium.
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