土壤中各类离子对X80埋地管道钢腐蚀行为研究

Study on Corrosion Behavior of Various Ions in the Soil to the X80 Buried Pipeline

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 physico-chemical analysis of soil around the burying pipeline,the influence of different ions（such as Cl-,SO42-,CO32-,HCO3-and Ca2＋、Mg2＋）on corrosion of X80 pipeline was studied.The results show that,with the increase of Cl-,CO32-and HCO3-concentration,the corrosion rate of X80 steel increases;After the corrosion rate reaches the maximum,corrosion rate decreases with the increase of Cl-,CO32-and HCO3-concentration;With the increase of SO42-concentration,the corrosion rate of X80 steel increases;With the increase Ca2＋and Mg2＋concentration,the corrosion rate of X80 steel decreases,but the degree of change is small,and the corrosion rate reaches the minimum in a certain ion concentration,then the corrosion rate increases with the increase of ion concentration.