镀锌层上有机物无铬钝化涂层的耐蚀性

选择了一种无毒的水溶性丙烯酸树脂（AC）加入至钼酸盐、磷酸盐中（M）得到一种钝化液（ACM），对镀锌层进行钝化处理以代替有毒的铬酸盐钝化。通过盐雾试验、扫描电镜、电化学测试等手段，研究了该纯化膜的耐蚀性及耐蚀机理。结果表明，热浸镀锌层采用该无毒钝化液进行钝化，可以推迟镀锌层出现白锈的时间，其抗蚀性已接近铬酸盐钝化水平；ACM钝化膜耐蚀性的提高是由于钝化膜中的钼酸盐与丙烯酸树脂产生交联作用，抑制钝化膜裂纹的扩展，同时由于膜层中钼酸盐的缓蚀作用，提高了镀锌层的抗蚀性。

Corrosion Resistance of Organic Chromate-Free Passivation Coating for Galvanized Steel

A new passivation bath(ACM) using a non\|toxic water solubility acrylic resin(AC) with some molybdate and phosphate(M) was developed for galvanized steel to instead of toxic chromate. Corrosion resistance and mechanism were studied by salt spaying test, SEM and electrochemistry tests etc. Results showed that ACM coating retarded the formation of white rust on the galvanized steel and the corrosion resistance of coating was closed to that of the chromate conversion coating. The corrosion mechanism of ACM coating might be concluded that cross linking reaction between inorganic groups such as MoO\+\{2-\}\-4, PO\+\{3-\}\-4 and certain organic groups of acrylic resin in passivation could prohibit the development of cracks in the coating and increase the corrosion resistance because of the inhibition of Mo and P in coating.