热镀锌钢表面铈盐与硅烷处理后的耐蚀性能  

EFFECT OF CERIUM SALT AND SILANE TREATMENTS ON CORROSION RESSISTENCE OF HOT-DIP GALVANIZED STEEL

作　　者：吴海江[1] 卢锦堂[1] 孔纲[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《腐蚀与防护》2007年第7期353-356,共4页Corrosion & Protection

摘　　要：将热镀锌（HDG）钢板经20g／L的Ce（NO3）3·6H2O溶液处理后浸涂5％（体积比）硅烷，研究膜层的耐蚀性能。5％NaCl溶液中的电化学极化曲线测试结果和中性盐雾试验（NSS）结果表明，单独的铈盐处理或浸涂硅烷膜都能够提高热镀锌层的耐蚀性，而经过该铈盐处理后再浸涂硅烷形成双层膜后能够明显地抑制腐蚀过程中的阴极和阳极反应，极化电阻Rp较HDG试样增加40多倍，也是单一膜层处理试样的5～9倍，膜层的耐蚀性能明显提高。俄歇电子谱（AES）分析表明，热镀锌试样经过两步处理后，在表面形成了双层膜，外层是富含C、Si、O的均匀硅烷膜层，里层是富含Ce的稀土转化膜层。A silane film was prepared on the hot-dip galvanized （HI）G） steel sheets after treated in 20 g/L Ce （NO3）3·6H2O solution. The corrosion resistance was assessed by polarization curves and nevatral salt spray（NSS） tests. The films were characterized by AES. The single cerium salt conversion film or silane film could improve the corrosion resistance of zinc coating. However, the double-layer film obtained from the two-step treatment could markedly restrain the anodic and cathodic reactions in the corrosion process and result in the optimal corrosion resistance. AES analysis revealed that the double-layer film was formed on the surface, which mainly consisted of an inside Ce-rich cerium conversion film and an outside homogeneous silane film.

关 键 词：铈转化膜 硅烷膜 热镀锌 耐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]