应用XPS和电化学测量技术研究了Ti-15Mo合金在70℃的1mol/L和4mol/LHCl溶液中不同阳极极化条件下生成的钝化膜。结果表明,钝化膜是双层结构,由表层和过渡层组成。在低极化电位(0.000和-0.100V)下膜表层较厚(4nm),富集Mo。在高极化电位(+0.900V)下膜表层较薄(2nm),贫Mo。在钝化膜内含有较多Cl~-,而且Cl~-分布很深。推测Cl参加了膜的生成反应,生成了Ti和Mo的含氯和氧的化合物。
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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