摘要
以钼酸盐、磷酸盐、植酸和有机硅烷为主要成分,辅以多种助剂,制备了一种防止镀锌钢板腐蚀的新型无铬复合钝化液。通过中性盐雾腐蚀试验(NSS)确定了该钝化液助剂的最佳组成;经电化学阻抗测试对耐蚀机理进行了初步探讨;经原子力显微镜、扫描电镜和X-射线能谱仪分析了所得钝化膜的形貌及膜层元素组成。结果表明,该处理工艺简单、成本较低,镀锌层经过该无铬钝化液处理后耐蚀性明显提高,经过NSS 96 h后的腐蚀面积小于5%。
In order to enhance the corrosion resistance of galvanized steel,a new chromate-free complex passivation bath using molybdate,phosphate,phytic acid and organic silane as principal constituents and other additives was prepared.The additives of the bath were optimized by neutral salt spray tests（NSS）.The corrosion resistance and mechanism of the passivation film were studied by electrochemical impedance spectra（EIS）,SEM and AFM were used to analyze the appear element buildup and morphology.The results showed that the process was simple with lower cost;corrosion resistance of zinc coating increased obviously after it was treated with the complex passivation bath,and the corrosion area proportion of treated samples was less than 5% after uninterrupted 96 h NSS.
出处
《化学与生物工程》
CAS
2010年第9期36-38,共3页
Chemistry & Bioengineering
关键词
无铬钝化
钼酸盐
助剂
表面形貌
non-chromate passivation
molybdate
additive
surface morphology
