采用快速水冷和空冷两种不同的轧后冷却制度得到强度范围在490～980MPa级的低碳微合金结构钢.用户外间断喷淋3.5%NaCl水溶液来模拟海洋大气腐蚀,对带锈试样进行电化学阻抗谱测试,并对锈层中腐蚀产物进行了观察分析.结果表明,不同强度级别的低碳微合金钢的长期耐腐蚀性能相近,并略优于商业化耐候钢09CuPCrNi.提高钢基体的组织均匀性有利于改善钢的初期腐蚀性能,在形成保护性锈层之前,基体腐蚀深度较小.少量颗粒细小相的存在.有利于提高钢基体与锈层的结合力;但大块珠光体的存在会危害钢的初期腐蚀性能,因此耐候钢09CuPCrNi初期腐蚀速率较大.
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