Objective To provide data support and theoretical basis for development of corrosion-resistant steel used in the South China Sea atmospheric environment, by comparing the corrosion resistance of several steels and analyzing shortages and merits of their performance. Methods Q235B, Q355 and Q500qE were chosen as study materials, and the corrosion resistance of the samples was investigated with neutral salt spray test methods to simulate the harsh atmosphere environment of South China Sea. The corrosion behavior and mechanism were further analyzed with the aids of surface morphology observation, corrosion weight loss and electrochemical measurement. Results Surface of Q235B was first completely covered by corrosion products and the corrosion rates were always higher than that of the other two materials. Surface protective film of Q355 and Q500qE played a role of delaying corrosion process at the early stage, among which Q500qE had the maximum polarization resistance and the most flat corrosion morphology. Conclusion Under the simu-lated South China Sea atmospheric environment, the corrosion resistance rank order of three materials was: Q500qE>Q355> Q235B.%目的 通过室内模拟南海大气环境加速腐蚀试验,对比分析几种钢腐蚀性能优劣,为开发耐南海大气腐蚀用钢提供数据支撑和理论依据.方法 分别选用Q235B,Q355和Q500qE三种材料作为研究对象,采用中性盐雾试验方法模拟南海苛刻大气环境对试样进行耐蚀性测试,通过试样表面形貌观察、腐蚀质量损失计算和电化学分析等手段研究其腐蚀行为机制.结果 Q235B表面最先被腐蚀产物完全覆盖,腐蚀速率始终大于另外两种材料.Q355和Q500qE表面膜初期起到延缓腐蚀作用,其中以Q500qE极化阻抗最大,腐蚀表面最为平整.结论 模拟南海大气环境下三种试验钢耐蚀性能排序为Q500qE> Q355> Q235B.
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