T2铜及QCr0.5铜合金无铬复配钼酸盐钝化研究  

Passivation of T2 Cu and QCr0.5 Cu-alloy with Chromate-free Solutions of Molybdate Compound

作　　者：宋久龙 陈文革[1] 雷楠楠 SONG Jiulong;CHEN Wenge;LEI Nannan(School of Materials Science and Engineering, Xi＇an University of Technology, Xi＇ an 710048, China)

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《中国腐蚀与防护学报》2018年第2期210-218,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：西安市科技项目(2017080CG/RC043)~~

摘　　要：采用单一钼酸盐与各种复配钼酸盐钝化液对T2铜与QCr0.5铜合金表面进行钝化处理,分别运用电化学法、硝酸点滴实验、中性盐雾实验、SEM,XRD等手段对不同钝化膜的微观结构与耐蚀性能进行研究,并与铬酸盐钝化结果进行对比。结果表明,双氧水与聚天冬氨酸(PASP)作为添加剂,可以提高钼酸盐的钝化效果,尤其是两者同时加入时显著促进了钝化膜的形成,使两种钢材的溶解及表面形貌的腐蚀程度降低到最低限度,形成以Cu的氧化物为主的钝化膜,显著提高试样的耐蚀性。相比未钝化试样,钝化试样表面光泽较好。钝化试样经过盐雾实验后,表面腐蚀坑较少,存在一定的金属光泽;特别是T2铜的钝化效果最好,其PASP+H_2O_2复配钝化后的自腐蚀电流密度仅为3.10×10^(-6)A/cm^2,近似于铬酸盐钝化的9.06×10^(-7)A/cm^2,达到了与铬酸盐钝化类似的效果。T2 Cu and QCr0.5 Cu-alloy were passivated in chromate-free solutions with single molyb- date and complex molybdate respectively. The formed passivation films were then characterized by elec- trochemical method, nitric acid drop test, neutral salt spray test, SEM and XRD etc., taking the passiv- ation film prepared with conventional chromate containing solution as comparison. Results show that the addition of polyaspartic acid （PASP） and H2O2 could improve the passivation effect of molybdate, espe- cially the addition of the both simultaneously, which promoted the formation of passive film, the de- crease of dissolution of Cu-alloy, and thereby the formation of a passivation film of copper oxide-based, significantly improved the corrosion resistance of T2 Cu and QCr0.5 Cu-alloy. After salt spray test, the surface of passivation treated samples presents metallic lustrousness to certain extent, while with less corrosion pits. In particular, the free-corrosion current density for T2 Cu passivated in molybdate solution with PASP＋H2O2 is only 3.10×10^-6A/cm^2, which is close to that for the chromate passivation film i.e. 9.06×10^-7A/cm^2.

关 键 词：T2铜 QCr0.5铜合金 钝化 钼酸盐 聚天冬氨酸 

分 类 号：TM271[一般工业技术—材料科学与工程]