采用动电位极化曲线、电化学阻抗谱、腐蚀形貌分析等方法研究了不同含量Fe3+溶液水解对304不锈钢点蚀行为的影响,并从动力学角度分析了蚀孔生长的过程.结果表明:随Fe3+含量的升高,水解产生的H+含量升高,使自腐蚀电流密度升高,而溶解氧去极化作用减弱,使得自腐蚀电位负移;由于氢去极化作用,电荷转移电阻逐渐减小,腐蚀速率加快;当Fe3浓度达到3.0 mol/L时,自腐蚀电流密度趋于平稳,金属离子的扩散控制了蚀孔生长,亚稳蚀孔向稳态蚀孔转变存在一个临界电流密度.
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