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在某钢厂生产的U76CrRE重轨钢基础上添加0wt%~0.09wt%的Nb(实验研究Nb的含量),采用25 kg中频感应炉冶炼+锻造工艺制备样品,利用周期浸润腐蚀试验结合电化学方法研究了范围内模拟工业大气环境下Nb微合金化对稀土重轨钢的腐蚀行为和作用机理的影响。结果表明:添加合金元素Nb有利于α-FeOOH的快速形成和含量的增加,提高锈层阻止侵蚀性介质穿透的能力,也在一定程度上提高了实验重轨钢的耐腐蚀性能。随Nb含量的增加,锈层与基体的结合由致密变得疏松,实验钢的耐腐蚀性能逐渐降低。
Based on the U76CrRE heavy rail steel produced by a steel mill, Nb (0% ~ 0.09wt% Nb) was added to the heavy rail steel produced by a steelmaking mill. The samples were prepared by smelting and forging process with a 25kg medium frequency induction furnace. Methods The effects of Nb microalloying on the corrosion behavior and mechanism of rare earth heavy rail steel in a simulated industrial atmosphere were studied. The results show that addition of alloying element Nb favors the rapid formation and content of α-FeOOH, improves the ability of the rust layer to prevent penetration of aggressive media, and also improves the corrosion resistance of the experimental heavy rail steel to a certain extent. With the increase of Nb content, the combination of rust layer and matrix becomes loose by dense, and the corrosion resistance of experimental steel decreases gradually.