Ti 合金の電子論に基づく結合次数と塩酸水溶液中における活性腐食速度との関係

概要

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In order to understand alloying effects on the corrosion resistance of titanium, polarization curves were measured at 343 K in 10 mass% HCl solution with various Ti-M binary alloys (M=Al, Nb, Ta, Zr, Hf, Fe, V, Cr, Mo, Co and Ni). The results were interpreted using an alloying parameter obtained by a molecular orbital calculation. The parameter is the bond order (Bo) which is a measure of the strength of the covalent bonds between titanium and alloying elements. It was found that alloys containing the elements with higher Bo values showed a lower critical anodic current density in the polarization curve and hence higher corrosion resistance. It is likely that the Bo is a convenient parameter for describing the corrosion rate of titanium alloys in a acid environment such as a hydrochloric acid.
社団法人日本鉄鋼協会の論文
1990-12-01