对铝浴中添加Si和RE后批量热浸铝(Batch Hot Dip Aluminizing)镀层的组织及耐盐水(3％NaCI)腐蚀性能的研究结果表明,铝浴中添加1～7％Si和适量(0.12～0.35％)RE,明显提高镀层耐腐蚀性能,减少镀层腐蚀速度随溶液温度升高而增加的幅度,但加入过量稀土则降低镀层耐蚀性。文中探讨了合金元素提高镀层耐蚀性能的原因。
The microstructure and corrosion resistance to salt spfay and salt water immersion (3% NaCl) of batch hot dip aluminized coatings containing Si and RE were studied. The tests indicated that addition of 1-7% Si and 0.05- 0.35% RE into the melted Al bath markedly improved the corrosion resistance of the coatings. But excessive RE would impair the improvement. With increasing temperature of salt water the corrosion rate of both Al coating and Al alloy coatings containing Si and RE increased remarkably, and for the Al alloy coatings the increase in corrosion rate was less than that for Al coating. The beneficial function of Si and RE in the corrosion resistance of the coatings was discussed.
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