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| A STUDY OF PASSIVE FILMS FORMED ON Ti-15Mo ALLOY IN HCl SOLUTIONS |
| WANG Guangyao WANG Hao (Beijing University of Chemical Technology) |
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Abstract The composition and structure of passive films formed on Ti-15Mo alloy under anodic polarization in 1 mol/L and 4 mol/L HC1 solutions at 70℃ were investigated by XPS and electrochemical techniques. It was found that the passive film was composed of an outer layer and an inner layer. The outer layer formed at less noble potentials (0.000 and -0.100V) was enriched in Mo, and had greater thickness (≈ 4 nm). On the contrary, the outer layer formed at more noble potentials (+0.900V) was depleted in Mo, and had smaller thickness (≈ 2 nm). A considerable amount of chloride ions was detected in the passive film. It can be inferred that chloride ions might take part in the fihn formation. The film probably consisted of a titanium molybdenum compound containing chloride and oxide.
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Received: 25 April 1997
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