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机构地区:[1]华南理工大学材料科学与工程学院,广州510640
出 处:《腐蚀与防护》2007年第8期396-399,共4页Corrosion & Protection
摘 要:将磷化后的热镀锌钢板用钼酸盐后处理,以提高磷化膜的耐蚀性。用SEM、EDS、电化学极化测量和盐雾试验研究了钼酸盐后处理对磷化膜组成和耐蚀性的影响。结果表明,经钼酸盐处理后,磷化膜上磷酸锌晶体间的孔隙被钼酸盐膜填补,从而在锌层表面形成了由磷化膜和钼酸盐膜构成的连续完整致密的复合膜;复合膜的极化电阻Rp显著增大,腐蚀电流密度显著减小,耐蚀性大大增强。磷化300s、后处理50s时复合膜的耐蚀性最优,Rp比单磷化膜的增加了一个数量级。To improve the corrosion resistance of phosphate coatings further, the phosphated hot-dip galvanized (HDG) steels were post-treated using molybdate solutions. The effect of molybdate post-treatment on the compositions and corrosion resistance of phosphate coatings was investigated by SEM, EDS, electrochemical polarization measurement and salt spray test. When the HDG steels were post-treated with molybdate, the pores among zinc phosphate crystals on phosphate coatings were filled up by molybdate films, and continuous and compact composite coatings composed of phosphate coatings and molybdate films were formed on zinc layers. Polarization resistance Rp of the composite coatings increased greatly, corrosion current density decreased strongly, and the corrosion resistance was improved markedly. When phosphating time was 300 s and post-treating time was 50 s, the composite coatings with optimal corrosion resistance were obtained, and Rp increased for more than ten times than that of the single phosphate coatings.
分 类 号:TG178[金属学及工艺—金属表面处理]
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