通过XRD、SEM、EDS、EPMA和XPS等手段，研究了锌铝铬转化 膜的元素组成、物相和微观结构，提出了锌铝铬转化膜的成膜机理.结果表明，在锌铝铬转 化膜层中存在着大量的锌粉和铝粉颗粒，这些金属颗粒之间以及它们与基体之间是靠三价铬 氧化物形成的非晶态物质nCr2O3·mCrO3所填充和粘结的.
The composition,phase and microstructure of zinc-al uminum-chromium conversion coating were studied by XRD,SEM,EDS,EPMA and XPS etc. The mechanism of coating formation was proposed.Results showed that the main ele ments in the coating are zinc,aluminum and chromium.Zinc and aluminum existed mo stly as zero-valent zinc and zero-valent aluminum,but chromium existed mostly as trivalent chromium oxide.There were lots of zinc and aluminum particles in the coating phase,when heating the coated substrate approximately to 300℃,t he hexavalent chromium was reduced to an insoluble amorphous oxide,nCrO3·mC r2O3,by the organic substance such as succinic acid,which acted as a binde r f or the particles of zinc and aluminum to form a film.At the same time,the chromi c acid in the treatment chemical reacted with the metal surface of the substrate forming a chemical bond providing strong adhesion.
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