利用干湿循环加速腐蚀实验方法研究了Mn-Cu低合金钢在模拟海岸大气条件下的锈蚀演化规律.结果表明,在腐蚀初期锈蚀速度随干湿循环次数的增加而增大,随后转为随干湿循环次数的增加而降低.带锈层的Mn-Cu低合金钢的电化学极化行为表明,干湿循环下的腐蚀产物促进阴极过程,抑制阳极过程.在干湿循环加速腐蚀进程中Mn-Cu低合金钢表面铁锈的化学组成、结构变化表现为在锈蚀初期α-FeOOH含量较低,锈层疏松,锈蚀速度呈随干湿循环次数增加而上升趋势;后期随α-FeOOH含量的增加和锈层变得更加致密,腐蚀速度转变为随干湿循环次数增加而下降.锈蚀演化过程中,腐蚀速度和极化行为随干湿交替次数的演化与相应的锈层组成、结构形貌的变化有对应关系.
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