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采用小脚掠射X射线衍射法、辉光放电光谱法、扫描电镜、60°弯曲试验及Tafel极化曲线测试法研究了不同合金化温度对工业生产条件下高强IF钢合金化热镀锌(GA)板镀层组织和性能的影响。结果表明,随合金化温度升高,镀层中Fe含量增加,Γ相层厚度增加,抗粉化性能降低,而耐腐蚀性能提高;合金化温度在500℃时,镀层表面以粒状δ相为主,同时还有部分柱状ζ相;合金化温度在550℃和570℃时,镀层表面由致密的粒状δ相组成;表面致密的δ相及Γ相层厚度的增加有利于镀层的耐腐蚀性能。
The effects of different alloying temperatures on the hot-dip galvannealing (GA) of high-strength IF steel under industrial conditions were studied by using grazing X-ray diffraction, glow discharge spectroscopy, scanning electron microscopy, 60 ° bending test and Tafel polarization curve test Effect of plate plating on microstructure and properties. The results show that as the alloying temperature increases, the content of Fe in the coating increases, the thickness of the Γ phase increases, the anti-chalking performance decreases and the corrosion resistance improves; when the alloying temperature is 500 ℃, the surface of the coating is mainly granular δ , At the same time there are some columnar ζ phase. When the alloying temperature is 550 ℃ and 570 ℃, the surface of the coating is composed of dense granular δ phase. The increase of δ phase and Γ phase thicknesses on the surface is in favor of the corrosion resistance of the coating.