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用XPS研究了1Cr18Ni9不锈钢表面氧化膜的组分与结构。实验表明膜中的Cr/Fe约为体内的3倍,并在组分和价态上具有不均匀的三层结构;表面层的主要成分为Cr,Fe的含氧氢氧化物;中间层的主要成分为Cr,Fe的氧化物;而过渡层则主要由金属状的Fe和少量Fe,Cr的氧化物组成。当阳极氧化膜用Na_2MoO_4溶液处理后,发现在整个氧化膜中都有Mo存在,其含置约为2%。表面层与中间层统称为阻挡层,它是不锈钢抗腐蚀的主要壁垒。过渡层介于阻挡层和基体之间,在这区域中有透过阻挡层进来的少量的氧存在。根据氧化膜中间层中Cr,Fe的氧化程度和过渡层中氧的含量与透入深度,讨论了阳极氧化膜与其它钝化膜(硝酸钝化膜和自然钝化膜)在抗腐蚀性能上差异的原因。
The composition and structure of 1Cr18Ni9 stainless steel surface oxide film were studied by XPS. Experiments show that the membrane Cr / Fe about three times the body, and in the composition and valence state has a non-uniform three-layer structure; the main component of the surface layer Cr, Fe oxyhydroxide; intermediate layer The main components of Cr, Fe oxide; and the transition layer is mainly composed of metallic Fe and a small amount of Fe, Cr oxide composition. When the anodized film was treated with Na 2 MoO 4 solution, it was found that Mo was present in the entire oxide film with a content of about 2%. The surface layer and the middle layer are collectively referred to as the barrier layer, which is the main barrier against corrosion of stainless steel. The transitional layer is interposed between the barrier layer and the substrate, and in this area there is a small amount of oxygen coming in through the barrier layer. According to the oxidation degree of Cr and Fe in the interlayer of the oxide film and the oxygen content and penetration depth in the transition layer, the corrosion resistance of the anodic oxide film and other passivation films (nitric acid passivation film and natural passivation film) is discussed The reason for the difference.