Abstract
In order to understand alloying effects on the corrosion of titanium, polarization curves were measured at 343 K in 10 mass%H2SO4 solution for various Ti-M binary alloys (M=Al, Nb, Ta, Zr, Hf, Fe, V, Cr and Mo). The results were interpreted in terms of two parameters obtained by the molecular orbital calculation; one is the bond order (Bo) and the other is the metal d-orbital level (Md). Bo is a measure of the strength of covalent bonds between titanium and alloying elements. Md is correlative with the electronegativity of elements.It was found that alloys containing elements with higher Bo values showed a lower critical anodic current density in the polarization curve and hence higher corrosion resistance. On the other hand, Md appears to be associated with the corrosion potential of alloys. It is likely that both Bo and Md are useful parameters for describing the corrosion of titanium alloys in a reducing atmosphere such as hydrochloric or sulfuric acid.
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