土壤盐浓差对碳钢/铝合金电偶腐蚀行为影响

摘要

The effect of salt concentration difference on the galvanic corrosion between carbon steel and LC4 aluminium alloy was studied in simulated soils of moisture sands by means of mass loss and electrochemistry. It is shown that the galvanic corrosion rate of LC4 aluminium alloy was decided by the factors of soil of carbon steel, not the factors of soils of LC4 aluminium alloy. The rate of cathode protection was high as the cathode existed in high salt concentration soil. The corrosion rate of LC4 aluminium alloy as galvanic anode was 145 times what it was in natural corrosion.%利用砂土作为模拟土壤，通过失重法及电化学方法相结合，研究了土壤盐浓差(2.0%Cl-及0.2%Cl-)对A3钢/LC4铝合金电偶腐蚀的影响规律。结果表明，其电偶腐蚀主要取决于电偶对阴极A3钢所处的土壤条件，而与电偶对阳极所处的土壤条件关系不大。电偶对阴极处在高盐土壤中，其阴极保护效率较高，电偶对阳极LC4铝合金与同样试验条件下自然腐蚀相比，其腐蚀速率最大增加了145倍。