【摘要】 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。更多还原

【Abstract】 The microstructure and properties of the coatings on industrially galvannealed high strength interstitial free( IF) steel with different galvannealing temperatures were investigated by means of scanning electron microscope( SEM),X-ray diffraction( XRD),glow discharge optical emission spectrometry( GDOES),60 degree V-bending test and Tafel polarization. The results show that with the galvannealing temperature increasing,the Fe content of coating and the thickness of Γ phases increase,the powdering resistance of the coating becomes weaker,while the corrosion resistance becomes better. When the galvannealing temperature is 500 ℃ and 520 ℃,the coatings surface is consist of δ and ζ phase while the majority of which is δ phase. When the temperature is 550 ℃ and 570 ℃,the surface of the coating is consist of δ phase. The compact δ and Γ phases are good for the corrosion resistance of the coating while bad for the powdering resistance.更多还原