Surface morphology of hot rolled plates with Al-Zn coating was observed by scanning electron microscopy (SEM).Neutral salt spray tests were applied to study the corrosion resistance of the hot rolled plates with Al-Zn coating.The results show that the corrosion resistance of the hot rolled plates was improved significantly as the galvanizing Al-Zn technology might fill up the pits on the surface of hot rolled plates.The corrosion rate of the hot rolled plates with Al-Zn coating first increased and then decreased with corrosion time.The white rust on the surface of Al-Zn coating was formed after 15 days,and the red rust occurred after 54 days.In addition,the corrosion kinetics model based on abundant experimental data was established,which had good fitting degree with experimental data and could provide theoretical basis for quantitative analysis of corrosion kinetics for hot rolled plates with Al-Zn coating.%采用扫描电子显微镜观察锌铝镀层热轧板表面形貌,并通过中性盐雾试验,研究了锌铝镀层热轧板耐蚀性.结果表明:镀锌铝工艺可以填补热轧板表面凹坑,使热轧板的耐蚀性显著提高;随着腐蚀时间的延长,锌铝镀层热轧板的腐蚀速率先增大后减小;5％白锈和5％红锈出现的时间约为第15天和第54天;结合试验数据建立的镀锌铝热轧板腐蚀动力学模型,与试验数据拟合程度较好,可以为锌铝镀层热轧板的腐蚀动力学定量分析提供理论依据.
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