【摘要】 对孪晶诱导塑性（TWIP）钢在纯Zn浴和Zn-Al浴中450℃热镀锌后的耐蚀性进行研究,分析热镀时间对镀层厚度的影响.利用金相显微镜、X线衍射（XRD）分别测试试样表层的显微组织和金属间化合物,并通过热浸时间和镀锌层厚度的拟合曲线研究Fe-Zn镀层的生长动力学.结果表明,镀锌层在基体上形成ζ(FeZn₁₃),δ(FeZn_7-10),Г₁(Fe₁₁Zn₃₉)和Г(Fe₃Zn₁₀)4种物相.加入Al元素后可生成FeAl₃抑制层,且FeAl₃质量分数在10.43%～19.32%时起扩散阻挡作用,延缓ζ相的生长并抑制δ相在TWIP钢上的形成;极化曲线结果表明,浸Zn-Al浴300 s的试样具有最佳耐蚀性.更多还原

【Abstract】 The corrosion resistance of twinning induced plasticity（TWIP） steel after hot dip galvanizing in pure Zn bath and Zn-Al bath at 450 ℃ was studied,and the influence of hot dip time on coating thickness was analyzed.The microstructure and intermetallic compounds on the surface of samples were tested by metallographic microscope and X-ray diffraction（XRD）.The growth kinetics of Fe-Zn coating was studied by fitting curves of hot dip time and zinc coating thickness.The results showed that four layers of ζ(FeZn₁₃),δ(FeZn_7-10),Г₁(Fe₁₁Zn₃₉),Г(Fe₃Zn₁₀) are formed on the substrate.The FeAl₃ inhibition layer can be formed after adding Al element,and the mass fraction of FeAl₃ plays a role of diffusion barrier in 10.43%～19.32%,retards the growth of ζ phase and inhibits the formation of δ phase on TWIP steel.The polarization curve results show that the sample immersed in Zn-Al bath for 300 s has the best corrosion resistance.更多还原