不锈钢上紫红色钼酸盐转化膜的研究

Studies of the Purple-red Molybdate Conversion Flim on Stainless Steel

用阴极电沉积法从钼酸盐和磷酸盐混合溶液中获得了紫红色不锈钢转化膜，该膜具有良好的热稳定性。ＸＰＳ和ＡＥＳ分析表明，膜厚约９４．４ｎｍ。钼在膜表面以Ｍｏ（Ⅵ）存在，在膜内则以Ｍｏ（Ⅵ）和Ｍｏ（Ⅳ）共存。从ＡＥＳ深度剥蚀曲线的组成恒定区求得膜的组成为：Ｏ５４．８％，Ｍｏ３０．５％，Ｐ１１．２％和Ｆｅ３．５％，循环伏安的氧化峰也证明膜内存在Ｍｏ（Ⅳ）。

A ptirple-red conversion film on stainless steel was formed by cathodic electrode-position from molybdate-phosphate solution,This film displayed good thermostability,Theresults of XPS and AES analysis showed that the thickness of the film was 94.4nm and Moexisted as Mo(Ⅵ)in the surface of the film, but as Mo(Ⅵ) and Mo(Ⅳ)in the internal layerof the film. The relative atomic percent content of the film obtained from the elemental com-position constant region of the depth profile curves by AES was O 54.8%, Mo 30.5%,P11.2%and Fe 3.5%respectively. The cyclevoltamrnetric oxidation peak also revealed theM0(Ⅳ)in the internal layer of the film.