Objective To research corrosion resistance of ordinary weathering steel and rare earth weathering steel (Cu-P-RE steel).MethodsBy the test of corrosion rate, the electronic probe and metallurgical technology, the effect of RE on characteris-tics of corrosion resistance was discussed.ResultsAfter RE was added to the weathering steel, the rust layer became more con-tinuous and denser, and the number of crack and holes decreased.Conclusion The physical barrier effect of rust layer including RE on corrosive medium is relatively perfect, which could restrain the corrosion of corrosive medium to steel matrix and en-hance the protective ability of matrix. The existence of RE elements is helpful to reduce the corrosion rate of weathering steel in the marine atmospheric environment of Qingdao and improve the atmospheric corrosion resistance of weathering steel.%目的 研究普通耐候钢和含稀土耐候钢(Cu-P-RE钢)的耐蚀性能.方法 通过腐蚀速率测试、电子探针、金相制作等技术手段探讨稀土对耐候钢耐蚀性能的影响.结果 在耐候钢中加入稀土后,含稀土耐候钢比普通耐候钢的锈层更加连续致密、裂纹孔洞数量减少.结论 含稀土锈层对腐蚀介质的物理阻挡作用相应改善,可有效抑制腐蚀介质对钢基体的进一步腐蚀,对基体的保护能力增强.稀土元素的存在有利于降低耐候钢在青岛海洋大气环境下的腐蚀速率,改善耐候钢的耐大气腐蚀性能.
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