地下水溶液中Cl^-、SO_4^(2-)和CO_3^(2-)离子对碳钢腐蚀性能的影响  

Effects of Cl^-,SO_4^(2-) and CO_3^(2-) ions on corrosion resistance of carbon steel in groundwater solution

作　　者：徐秋发[1] 高克玮[1] 庞晓露[1] 刘超[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2015年第7期166-173,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51271024)

摘　　要：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 influence of aggressive ions,such as Cl^-,SO4^2-and CO3^2-,on the corrosion behavior of carbon steel Q235 was investigated by means of chemical immersion method in simulated groundwater. The results show that as the Cl^-concentration increases,the corrosion rate of the carbon steel first increases and then decreases; SO4^2-exhibits certain inhibition to corrosion,with the addition of SO4^2-,reducing the uniform corrosion rate and crevice corrosion depth. The increasing of CO3^2-concentration can cause the variation of p H value,resulting in changes of the morphology and composition of corrosion products; subsequently,Fe CO3 corrosion product without protective ability to the substrate forms leading to pitting initiation; With the increase of CO3^2-,crevice corrosion has a tendency to increase.

关 键 词：碳钢Q235 均匀腐蚀 缝隙腐蚀 

分 类 号：TG142.3[一般工业技术—材料科学与工程]