多晶Fe60Ni40合金阳极钝化膜的XPS研究

过渡金属Fe、Ni或其合金由于它们具有磁性和在工业上被用作催化剂等，它们与氧化腐蚀性气体02、C12等的作用已被广泛研究［‘－3］．含Ni的不锈钢和含Ni50％的FeNi基合金在酸性溶液中表现出比铁更好的耐腐蚀性并增强了氧化钝化层的附着力，放它们在溶液的腐蚀与钝性研究已引起广泛的兴趣，甚至包括对F6Ni基非晶合全玻璃的腐蚀与钝性研究【4一刊，用不同的方法研究溶液状态下的自然氧化膜或阳极钝化膜，得出的结果不同，对腐蚀与钝性解释也很不一致，硼酸一础砂或磷酸一磷酸盐缓冲液在工业上被广泛用作清洗剂、缓蚀剂或成膜剂等·因此，…

XPS Investigation of Anodic Passive Films on Fe_(60)Ni_(40) Polycrystalline Alloy

Anodic passive films formed on Fe60Ni40 in H3BO3-Na2B4O7 buffer solution (pH=9.20) and in H3PO4-Na2HPO4 buffer solution (pH=7.41) have been investigated by XPS. By analysis of the chemical states of elements, components and structure of films, we have probed into the mechanism of the formation of the anodic passive films. In the H3BO3-Na2B4O7 buffer solution (pH=9.20), the formation of passive film was controlled by adsorption of OH-, and the growth of the passive film was a function of passivation potential and time in passive range. The duplex structure, the Fe、Ni/FeOx、NiO/FeOOH、Ni(OH)2 was confirmed by detailed peak analysis and profiling. In H3PO4-NiHPO4 buffer solution(PH=7.41), the formation of passive film was controlled by competitive react, that is, cations of anodic dissolution reacted with anions such as PO43- and OH- et al in solution to form compacted deposit films of the phosphate phase.