根据Mn--Cu耐候钢大气腐蚀锈层的研究进展, 总结了低合金钢锈蚀的增重和腐蚀速率、锈层的组成和截面形貌等多个因素随干湿循环次数变化的演化规律, 阐述了所建立的室内干湿循环模拟大气腐蚀加速实验方法的合理性. 论述了以Cu, Mn和P为合金元素协同提高钢腐蚀锈层的耐海岸大气和工业酸雨大气腐蚀的原理, 介绍了Mn--Cu钢锈层的离子选择特性与结构关系的理论以及P在锈层中的作用机制.
The rust evolutions of the corrosion mass gain, the corrosion rate, the chemical composition, and the cross-section of the rust layer versus cycles of dry/wet alternate corrosion test were summarized on the basis of the study progress on the rust layer of Mn-Cu weathering steel. The validity of the cyclic dry/wet corrosion acceleration test simulating the atmospheric corrosion has also been discussed. Moreover, we have described the principle of synergistically improving the corrosion resistance of the rust layer resisting to both coastal atmospheric corrosion and industrial acidic rain atmospheric corrosion through adding alloying elements Cu, Mn and P. Meanwhile, the mechanism of P in the rust layer and the relationship of the ion-selectivity of Mn-Cu steel rust layer and its structure have been discussed.
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