采用薄层电化学测试技术，并结合结露试验和表面粗糙度测量研究了冷轧低碳钢板的耐大气腐蚀性能.研究表明，薄层电化学测试技术可以评价冷轧低碳钢板耐大气腐蚀性能，且评价结果与钢板的实际使用情况基本一致.冷轧低碳钢板表面结露行为与钢板表面粗糙度分布有关，但与钢板的耐大气腐蚀性能并无直接关系.
The corrosion of 7 kinds of mild steel and low alloy steel in immersion-wet-dry cycle test environment and the electrochemical feature of rusted metals after test were studied by using EIS and SEM et al.The solution containing HSO-3 and Cl-,was used for wetting and immersion specimens at circumstance temperature 40℃ for 4 min respectively.The drying cycle was maintained for 12 min at temperature 12℃.The results indicated that,the weight loss all followed exponential decay function:Y=Y0+Ae-t/B.The corrosion rate of mild steel was 2.49 times than that of the most corrosion resistant low alloy after 120 h test.The results of electrochemical measurement showed that,the further corrosion rate would be controlled by cathodic diffusion process.The impedance of 7 kinds of steels after corrosion test was linear with the annual corrosion rate.
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