硫酸盐三价铬镀层的耐蚀性及色度研究

Abstract

以厦门大学研发的XTC-硫酸盐三价铬镀铬工艺进行中试试验,利用扫描电子显微镜(SEM)、能谱仪(EdS)和CM-2600dlAb值测试仪分别对镀层的表面形貌、组分和色度进行表征,考察了电流密度和导电盐浓度对镀层抗腐蚀能力和色度的影响。结果表明,镀件外观均匀一致,色度白亮、略偏黄;镀层形貌平整、致密,为微裂纹结构;当电流密度为3~6A/dM2,导电盐质量浓度为170g/l时,所得镀层能够通过CASS16H测试。

A pilot-scale test for XTC-sulfate trivalent chromium electroplating process developed by Xiamen University was carried out.The surface morphology,composition and chroma of the deposit were characterized by scanning electron microscope(SEM),energy-dispersive spectrometer(EDS) and CM-2600d Lab values tester.The effects of current density and concentration of conductive salt on the corrosion resistance and chroma of deposit were studied.The results indicated that the deposit features a uniform,bright and white appearance with a bit yellowish color,as well as a level and compact morphology with a micro-crack structure.The deposit prepared with conductive salt 170 g/L at current density 3-6 A/dm2 can pass 16-h CASS test.