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选用Q235和Q345钢,在纯锌浴和含钛量分别为0.05%、0.10%、0.15%、0.20%(质量分数)的合金浴中浸镀0.5、1、3、5、8 min。利用扫描电子显微镜和能谱仪研究了钛对热浸镀锌组织和生长动力学的影响,并提出钛对含硅钢铁锌反应抑制作用的机理。结果表明:钛的加入缩短了Γ的孕育期,促进了合金层中δ的生长和ζ的消失,δ的生长依然受扩散控制,呈抛物线生长规律;Zn-0.05%Ti锌浴可以很好的抑制高硅钢的硅反应性;含硅钢热浸镀锌钛合金浴时,在锌浴中会形成锌铁钛三元T相,该相能吸收ζ晶界处富集的硅,从而抑制了铁锌反应。
The Q235 and Q345 steels were used and immersed for 0.5, 1, 5, 5, and 8 min in a pure zinc bath and an alloy bath containing 0.05%, 0.10%, 0.15% and 0.20% (mass fraction) of titanium respectively. The effect of titanium on the microstructure and growth kinetics of hot-dip galvanized steel was studied by scanning electron microscopy and energy dispersive spectroscopy. The mechanism by which titanium inhibited the reaction of iron-zinc with silicon was proposed. The results showed that the addition of titanium shortened the incubation period of Γ, promoted the growth of δ and the disappearance of ζ in the alloy layer, and the growth of δ was still controlled by diffusion with a parabolic growth law. Zn-0.05% Ti zinc bath could be very good Inhibition of silicon reactivity of high silicon steel; silicon steel hot-dip galvanized titanium alloy bath, the zinc bath will be formed in the zinc-iron titanium ternary T phase, the phase can absorb ζ grain boundary enriched silicon, thereby inhibiting the iron Zinc reaction.