目的：提高超高强度钢耐海洋大气腐蚀的性能。方法采用周期浸润腐蚀试验箱模拟一般条件下海洋大气腐蚀试验，通过金相显微镜和扫描电子显微镜观察低合金超高强度钢的组织和夹杂物的形貌，采用失重法和电化学阻抗技术分析腐蚀动力学规律及电化学行为规律。结果稀土在低合金超高强度钢中具有细化组织和变质夹杂物的作用，稀土增强了锈层的致密性，使得低合金超高强度钢的耐蚀性能显著提高，且随着稀土含量的增加，锈层电阻值逐渐增大，即稀土提高了锈层对基体的保护能力。结论在低合金超高强度钢中添加稀土能够细化组织、变质夹杂物。稀土低合金超高强度钢的夹杂物主要为球形稀土复合氧硫化物。稀土质量分数为0.08%的低合金超高强度钢的耐腐蚀性能最好。
ABSTRACT:Objective To improve the resistance of ultrahigh-strength steel to marine atmospheric corrosion. Methods The mi-crostructure and inclusion morphology of low-alloying ultrahigh-strength steel were observed by means of optical microscope and scanning electron microscope using periodic infiltration corrosion test box to simulate marine atmospheric corrosion tests under gen-eral conditions. Results The rare earth elements in the low-alloying ultrahigh-strength steel had the effects of refining microstructure and modifying inclusion. Rare earth enhanced the compactness of the rust layer, which remarkably improved the corrosion resist-ance of low-alloying ultrahigh-strength steel. Moreover, the resistance of the rust layer gradually increased with increasing rare earth content, which meant rare earth improved the protective capability of the rust layer for the substrate. Conclusion Adding rare earth elements in low-alloying ultrahigh-strength steel could refine the microstructure and modify inclusion. The inclusion of rare earth low-alloying ultrahigh-strength steel was mainly spherical rare earth oxysulfide composite. The corrosion resistance of low-allo-ying ultrahigh-strength steel with rare earth content of 0. 08% was the best.
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