将已磷化的热镀锌钢板经双-[3-(三乙氧基)硅丙基]硫化物(BTESPT)硅烷溶液封闭处理后,可以获得高耐蚀性的复合膜.通过SEM、EDS、电化学极化测量和NSS试验研究了复合膜组成和耐蚀性.结果表明,经硅烷封闭处理后,磷化膜上磷酸锌晶体间的微孔隙被硅烷膜填补,从而在锌层表面形成了连续、完整、致密的复合膜;经磷化300 s、硅烷封闭处理后,复合膜的极化电阻Rp显著增大,腐蚀电流密度Jcorr显著减小,NSS试验5个周期未出现白锈,耐蚀性能优异.
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