吴志锋，宋义全，安玥，冯宇飞
（内蒙古科技大学材料与冶金学院，内蒙古 包头 014000）
关键词：稀土La；海洋大气腐蚀；周期浸润试验；交流阻抗谱（EIS）
中图分类号：TG172.3 文献标识码A
摘要：通过周期浸泡加速腐蚀实验研究700MPa级稀土钢和非稀土钢在模拟海洋大气环境的耐腐蚀性能。利用SEM和EDS研究了两者的腐蚀形貌和锈层特征，利用失重法和电化学方法对两者的腐
蚀速率比较。结果表明：稀土钢的腐蚀速率小于非稀土钢的腐蚀速率，且腐蚀形貌也不相同。随着稀土含量的增加，稀土钢的自腐蚀电流密度降低，有利于钢基体表面的电化学反应速率放
缓，腐蚀倾向降低，从而提高稀土钢的耐腐蚀性能。
Effect of rare elements La on the corrosion resistance of high strength steel in 700MPa grade automobile plate
Wu Zhi-feng，Song Yi-quan， AN Yue，FENG Yu-fei
（School of Materials and Materials and Metaullrgy，Inner Mongolia University of Science and Technology，Boutou 014000，China）
Key words: rare earth La； marine atmospheric corrosion；Periodic infiltration test；AC impedance spectra (EIS)
Abstract:The corrosion resistance of the rare earth steel and non rare earth steel of 700 MPa grade in the simulated marine atmospheric environment was studied by the accelerated corrosion experiment. The corrosion morphology and rust layer characteristics of both steel were studied by using SEM and EDS, and their corrosion rates were compared. The results show that the corrosion rate of the rare earth steel is less than that of the non-rare earth steel, and their corrosion morphology is different. With the increase of the rare earth content , the self corrosion current density of the rare earth steel decreased, which is beneficial to the electrochemical reaction rate of the steel substrate and the corrosion tendency, so the corrosion resistance of the rare earth steel is improved.