针对铁路高强耐候钢的特点,通过调整钢中的镍含量,研究了试验钢耐大气腐蚀的变化规律,结果表明:在低铬和低镍条件下,试验钢表面基体与内锈层之间存在裂纹现象,随着钢中镍含量的增加,表面锈层厚度呈减薄的趋势,且致密性增加;在曝晒初期试验钢表面锈层结构以γ-FeOOH为主;随着曝晒时间的延长,表面锈层产物组成中不仅含有γ-FeOOH相,而且还出现了α-Fe00H相;而且随着镍含量的升高,试验钢表面锈层中α-FeOOH和γ-FeOOH比值逐渐增大.
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