用Auger电子能谱仪(AES)研究1Cr18Ni9不锈钢表面阳极氧化膜的组分分布。用Ar~+溅射剥层所作的剖面分析发现过钝化阳极氧化膜的表面层中含有大量的Mo与Cr的离子,中间层基本上是一个富Cr的氧化层,Fe处于中性态;然后逐渐过渡到基体内,在过渡层中氧逐渐减少到零。与硝酸钝化膜和自然钝化膜中元素的剖面分布相比,过钝化阳极氧化膜的富Cr区要比后二种膜宽得多,膜中Cr的氧化程度也比较完全。根据这些特点讨论了过钝化阳极氧化膜抗腐蚀性能比硝酸钝化膜优良的原因。
The AES has been used to study the composition of the anodic oxide film on 1Cr18Ni9 stainless steel. The film was formed in the transpassive region during the constant potential anodic polarization in H_2SO_4 and after a treatment with Na_2MoO_4. It has been found that the outer layer of the film contains a lot of Mo and the middle layer is rich in Cr. The concentration of oxygen in the rest of the layer up to the interface rapidly reduces to zero. The middle layer in the transpassive anodic oxide film which is rich in Cr is more wider and oxidized more complete than that in HNO_3 oxide film. By comparison with other oxide films, the possible mechanisms for passivation of transpassive anodic polarization are discussed.
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