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通过化学浸泡法研究了中国西北某地区地下水模拟溶液中的主要侵蚀性离子Cl-、SO42-、CO32-对碳钢Q235的侵蚀作用。结果表明,碳钢的腐蚀速率随溶液中Cl-浓度增大先上升后下降,缝隙腐蚀深度先减小后增大;SO42-对腐蚀有一定的抑制作用,随SO42-的加入,降低了均匀腐蚀速率和缝隙腐蚀深度;CO32-通过影响p H值改变了腐蚀产物的形貌和成分,生成没有保护性的Fe CO3腐蚀产物膜,容易产生点蚀;随CO32-浓度的升高,缝隙腐蚀有增大的趋势。
The chemical attack methods were used to study the erosion of Q235 by the main aggressive ions Cl-, SO42- and CO32- in groundwater simulated solution in a certain area of Northwest China. The results show that the corrosion rate of carbon steel first increases and then decreases with the increase of Cl- concentration in solution, and the crevice corrosion depth first decreases and then increases. SO42- has some inhibition on corrosion, and decreases with the addition of SO42- Corrosion rate and crevice corrosion depth; CO32- changes the morphology and composition of corrosion products by affecting the value of p H, resulting in the formation of unprotected film of Fe CO3 corrosion products, which is prone to pitting corrosion. With the increase of CO32- concentration, crevice corrosion There is an increasing trend.