镀锌层表面KH-560硅烷膜耐蚀性能研究

Study of the Corrosion Resistance of KH-560 Silane Film on Hot-dip Galvanzied Steels

利用正交实验研究了硅烷偶联剂在镀锌板上的钝化工艺,采用KH-560对热镀锌板进行钝化处理。比较钝化膜与空白试样在5%NaCl溶液中的极化曲线、电化学交流阻抗谱,并通过盐水浸泡实验进一步验证了硅烷膜的耐蚀性能。结果表明:经硅烷钝化处理后的镀锌板,其腐蚀电流密度下降,极化电阻升高,硅烷膜抑制了镀锌板的腐蚀过程,其耐蚀性能优于空白试样,接近铬酸盐钝化膜的耐蚀性。

Orthogonal experiment was used to study the passivation process on galvanized steel with silane.A KH-560 silane passivating treatment process was studied on galvanized steel.The electrochemical behavior of KH-560 silane film on galvanized steel in 5% NaCl solution was evaluated by polarization curves and electrochemical impendence spectroscopy.And more by the NaCl immersion test validate the corrosion resistance of KH-560 silane film.Results showed that the corrosion current density decreases and the polarization resistance increases after KH-560 passivation.KH-560 silane film inhibits the corrosion rate of the galvanized steel.After KH-560 passivating treatment,the corrosion resistance of the conversion coating was better than that of without passive films,and almost as well as chromate coatings.