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锅炉化学清洗过程中产生的Fe3+会大大加速碳钢的腐蚀速度。更危险的是,当清洗剂中的[Fe3+]达到一定数值(临界值)时,碳钢发生点蚀的可能性就很大。为消除Fe3+带来的不良影响,可以用还原剂将其还原成Fe2+,也可以用掩蔽剂将Fe3+包络起来。实验中,首先用失重法确定了对碳钢产生明显点蚀的Fe3+浓度临界值,最后比较了在清洗液中加入不同添加剂消除Fe3+影响的效果。
Fe3 + generated in the boiler chemical cleaning process will greatly accelerate the corrosion rate of carbon steel. More dangerously, when [Fe3 +] in the cleaning agent reaches a certain value (critical value), there is a high probability of pitting carbon steel. In order to eliminate the adverse effect caused by Fe3 +, it can be reduced to Fe2 + with a reducing agent, and the masking agent can also be used to envelop Fe3 +. In the experiment, the critical value of Fe3 + concentration with obvious pitting corrosion on carbon steel was determined by weight loss method. Finally, the effect of adding different additives in the cleaning liquid to eliminate Fe3 + was compared.