钢铁表面 W-S 簇合物彩色钝化膜的组成和结构

Constitution and Structure of the Colored Passive Films of WS Cluster Compounds on Steel Surface

通过（ＮＨ４）２ＷＳ４溶液浸渍，在钢铁表面获得了具有良好装饰效果和耐蚀性能的彩色Ｗ－Ｓ簇合物膜．ＦＴ－ＩＲ、Ｆ－ＩＲ、ＦＴ－Ｒａｍａｎ、ＸＰＳ和ＡＥＳ分析结果表明，簇合物膜中存在Ｗ—Ｓ—Ｆｅ、端基Ｗ—Ｓ和端基Ｗ—Ｏ键，膜层由Ｗ、Ｓ、Ｆｅ、Ｏ元素组成，膜外层各元素价态分别为＋６、＋６（＋４）、＋３、－２，膜内层其价态则分别为＋６（＋４）、－２、＋２、－２．膜为多分子层结构，从ＡＥＳ深度分布曲线的组成恒定区求得了元素的相对原子分数和膜层厚度．反应时间越长，膜越厚．在２５０℃空气中加热２ｈ后膜层所含元素种类和价态不变。

Colored WS cluster compound films as decorative and anticonosive layers were coated on strrl surface by immevsing in WS2-4 solution. The results of FTIR, FIR, FTRaman, APS and AES analyses showed the existence of WSFe, terminal WS and terminal WO bonds in the cluster films. The films were composed of the elements W, S, Fe and O. The valences of these elements are found to be +6, +6(+4), +3, -2 in the surface, and +6(+4), -2, +2, -2 in the internal layer of the films, respectively. A multimolecular layer structure of the films has been verified. The relative atomic percent contents and the thickness of the films were calculated at the constant elemental composition section on the AES profile curves. The longer the reaction time, the thicker the films. On heating at 250 in air for 2 hours the structure and distribution of the elements changed, while the composition and valence state of the elements in the films remained unchanged.