为避免热镀锌时含硅活性钢形成表面灰暗、超厚而粘附性差的镀层,研究了0.37%Si钢在含锡量分别为0,3%,5%,7%和12%(质量分数)的锌浴中浸镀不同时间时镀锌层的生长及组织变化.结果表明,在锌浴中加入一定量的锡以后,镀层的超厚生长得到了抑制.当锡含量小于5%时,抑制效果随锡量增加而增加,当锡含量大于5%时,抑制效果随锡量增加不再明显增加.在锌浴中加5%锡以后,高硅钢的镀层中的δ层变厚而非常致密,ζ层显著变薄并由疏松的块状变为排列整齐的柱状晶.基于镀层中微区成分分析结果,锌浴加锡抑镀层快速生长的原因是由于在ζ层的前沿形成了一个阻碍铁锌互扩散的富锡区.
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