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通过对延长某管线埋深处土壤进行理化分析,在室内配制模拟液,浓度变化范围与现场离子浓度变化范围一致。通过室内实验研究了土壤中Cl-、SO42-、CO32-、HCO32-阴离子和Ca2+、Mg2+阳离子等因素对X80钢腐蚀的行为。结果表明:随着Cl-、CO32-、HCO3-离子浓度的增加,X80钢的腐蚀速率增大,在某一离子浓度时,腐蚀速率达到最大,然后腐蚀速率随着离子浓度的增加而减小;随着SO42-浓度的增大,X80钢的腐蚀速率增大;随着Ca2+、Mg2+浓度的增加,X80钢的腐蚀速率减小,但变化程度不大,在某一离子浓度时,腐蚀速率达到最小,然后腐蚀速率随着离子浓度的增加而增加。
Through the physical and chemical analysis of the extension of the buried depth of a pipeline, the simulation liquid was prepared indoors, and the variation range of the concentration was consistent with that of the field ion concentration. Through laboratory experiments, the corrosion behavior of X80 steel on Cl-, SO42-, CO32-, HCO32- and Ca2 +, Mg2 + cations in soil was studied. The results show that with the increase of Cl-, CO32- and HCO3- ion concentration, the corrosion rate of X80 steel increases. At a certain ion concentration, the corrosion rate reaches the maximum, and then the corrosion rate decreases with the increase of ion concentration The corrosion rate of X80 steel increased with the increase of SO42- concentration. With the increase of Ca2 + and Mg2 + concentrations, the corrosion rate of X80 steel decreased, but the degree of change was insignificant. At a certain ion concentration, the corrosion rate To a minimum, the rate of corrosion then increases with increasing ion concentration.