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研究了一种适用于连续热镀锌钢板表面处理的钛盐钝化膜。通过正交试验和单因素试验,确定了钛盐钝化工艺的最佳条件为:Ti(SO4)28g/L、H2O280mL/L、HNO36mL/L、H3PO46mL/L,钝化温度30°C,钝化时间10s。扫描电镜和能谱分析发现,由最佳工艺得到的钝化膜均匀致密,由O、P、Ti和Zn组成。电化学测试表明,钛盐钝化膜有明显的钝化区,极化电阻提高到15～17k?,中性盐雾试验达到24h以上。
A titanium passivation film suitable for the surface treatment of continuous hot dip galvanized steel was studied. Through orthogonal test and single factor test, the optimum conditions of titanium salt passivation process were determined: Ti (SO4) 28g / L, H2O280mL / L, HNO36mL / L, H3PO46mL / L, passivation temperature 30 ℃, The time of 10s. Scanning electron microscopy and energy spectrum analysis showed that the passivation film obtained by the best process was uniform and compact and consisted of O, P, Ti and Zn. Electrochemical tests show that there is a clear passivation zone of titanium salt passivation film, the polarization resistance increased to 15 ~ 17k?, Neutral salt spray test reached more than 24h.