镀锌层三价铬钝化工艺的研究  

PASSIVATION OF GALVANIZED STEEL BY TRIVALENT CHROME

作　　者：任艳萍[1] 陈锦虹[2] 

机构地区：[1]广州民航职业技术学院,广州510403 [2]华南理工大学材料学院,广州510640

出　　处：《腐蚀与防护》2007年第1期13-16,19,共5页Corrosion & Protection

摘　　要：对热镀锌层上采用三价铬盐和三价铬盐加丙稀酸树脂两种钝化液钝化,探讨钝化液浓度、pH、钝化处理温度和时间对膜层耐腐蚀性能的影响。确定其钝化工艺,以取代六价铬盐钝化。试验结果表明,三价铬钝化液的最佳组分是将CrO3还原为三价铬,HNO3为氧化剂,硫酸和硼酸为添加剂。三价铬加丙烯酸树脂钝化液是以Cr2(SO4)3为主盐,次磷酸钠为络合剂,HNO3为氧化剂,硫酸和硼酸为添加剂,再加入与水的最佳体积比为1∶3的丙烯酸树脂为最佳组成。采用三价铬盐或三价铬加丙稀酸树脂钝化均可推迟镀锌层出现白锈的时间,三价铬加丙烯酸树脂钝化液效果更好。Passivation treatment technology for hot-dip galvanized steel using a trivalent chrome or a trivalent chrome with acrylic resin had been developed. The effects of the concentration, pH, time and temperature of passivation on the corrosion resistance of passivation film were studied. The best technology of the treatment was acquired by CrO3 being reduced, HNO3 as passivation oxidizer, H2SO4 and HBO3 as additives. In addition, with Cr2（SO4）3 and NaHzPO2 as complexing agents, Hz SO4 and HBO3 as additives, adding the ratio of acrylic resin to H2 O 1 ： 3, a best passivation film was formed. The time to white rust emergence on the hot-dip galvanized steel surface was delayed by passivation treatments using a trivalent chrome or a trivalent chrome with acrylic resin, and corrosion resistance of the film treated by the later was better.

关 键 词：三价铬钝化 丙烯酸树脂 热浸镀锌 

分 类 号：TG178[金属学及工艺—金属表面处理] TQ153.1[金属学及工艺—金属学]