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研究了Zn-Sn和Zn-Sn-Ni浴中高硅钢(含Si0.36%)表面镀锌层的生长和微观组织变化,探讨了Sn和Ni抑制高硅钢镀层快速生长的原因。结果表明,含Sn锌浴能抑制高硅钢表面镀锌层的快速生长,抑制效果随锌浴中Sn含量的增加而增强。当锌浴中的Sn含量达5%时,高硅钢镀锌层的生长方式发生了改变,由反应扩散控制变为扩散控制。高硅钢在Zn-Sn或Zn-Sn-Ni浴中镀锌时,镀锌层的ζ/η界面形成了Sn或Sn和Ni富集区,在一定程度上阻滞了Fe-Zn扩散。锌浴中添加微量的Ni能显著减少Sn用量,当锌浴中Ni的添加量为0.06%时,Sn的用量可从3%降到1.5%。
The growth and microstructural changes of zinc coating on high-silicon steel (containing Si of 0.36%) in Zn-Sn and Zn-Sn-Ni baths were investigated. The reasons for the rapid growth inhibition of high-silicon steel coating by Sn and Ni were discussed. The results show that Sn-Zn bath can inhibit the rapid growth of zinc coating on the surface of high-silicon steel, and the inhibition effect is enhanced with the increase of Sn content in the zinc bath. When the content of Sn in the zinc bath reaches 5%, the growth mode of the high-silicon steel galvanized layer changes from reaction diffusion control to diffusion control. When the high-silicon steel is galvanized in Zn-Sn or Zn-Sn-Ni bath, the Sn / Sn and Ni-rich regions are formed on the ζ / η interface of the zinc coating, which hinders the diffusion of Fe-Zn to a certain extent. The addition of a small amount of Ni in the zinc bath can significantly reduce the amount of Sn. When the amount of Ni added in the zinc bath is 0.06%, the amount of Sn can be reduced from 3% to 1.5%.