吸氧腐蚀的腐蚀过程

2025-03-17 00:00:58
推荐回答(1个)
回答1:

随着盐浓度的增加,溶液导电性增加,腐蚀速度增加;同时,随着盐量增加,氧在溶液中的所谓溶解度降低,从而降低腐蚀速度。盐量的这种双重作用导致金属腐蚀速度在某个盐浓度时出现极大值在盐浓度很低时,氧的溶解度比较大,供氧充分,此时随着盐浓度增加,由于电导率增加,吸氧腐蚀速度增加。当盐浓度进一步增加,会使溶解度显著降低,从而吸氧腐蚀速度也降低。
溶液搅拌和流速的影响
在氧浓度一定的条件按下,极限扩散电流密度与扩散层厚度成反比,溶液流速越大,扩散层厚度越小,氧的极限电流密度也就越大,腐蚀速度越大。
析氢腐蚀与吸氧腐蚀的比较 比 较 项 目析氢腐蚀吸氧腐蚀去极化剂性质带电氢离子,迁移速度和扩散能力都很大中性氧分子,只能靠扩散和对流传输去极化剂浓度浓度大,酸性溶液中H+放电,中性
或碱性溶液中H2O作去极化剂 浓度不大,其溶解度通常随温度升高和盐浓度增大而减小阴极控制原因主要是活化极化:=2.3RT lgiC/i°/αnF主要是浓差极化:=2.3RT/nFlg(1-iC/iL)阴极反应产物以氢气泡逸出,电极表面溶液得到附加搅拌产物OH只能靠扩散或迁移离开,无气泡逸出,得不到附加搅拌

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