pH值对低碳钢在高含盐污水中的腐蚀影响  

Effect of pH Value on Corrosion Behavior of Low Carbon Steel in High Salt Waste Water

作　　者：赵景茂[1] 左禹[1] 熊金平[1] 田连朋[1] 

机构地区：[1]北京化工大学材料科学与工程学院,100029

出　　处：《材料保护》2001年第7期8-9,共2页Materials Protection

基　　金：国家重点基础研究规划 (G19990 650 );北京市自然科学基金 ( 2 972 0 0 9)资助

摘　　要：为了防止油田地面输油管线穿孔 ,利用动电位扫描法和缝隙腐蚀实验研究了pH值对低碳钢在某油田高含盐污水中腐蚀行为的影响。结果表明 :随着pH值的升高 ,低碳钢的均匀腐蚀速度逐渐下降 ,但当pH值超过某一临界值后(约 8.5) ,缝隙腐蚀开始加剧 ;该临界值与低碳钢发生钝化时的pH值相一致。探讨了pH值对缝隙腐蚀的影响机理。提高污水的pH值 ,能降低碳钢的均匀腐蚀速度 ,但pH值过高易引起碳钢的缝隙腐蚀。因此 ,pH值应小于 8.5。In order to prevent corrosion punching of oil pipeline on ground in oilfield the effect Of pH value on corrosion behavior of low carbon steel inhigh salt contained waste water in a oilfield was studied with potentiodynamic technique and crevice corrosion test. The result indicates that the uniform corrosion rate on low carbon steel decreases with the rising of pH value. When the pH value gets up to critical value (about 8.5), the passivation occurs, but when the pH value exceeds the critical value,crevice corrosion exacerbates. The mechanism of the effect of pH value on crevice corrosion was discussed. Increasing pH value can decrease the uniform corrosion rate on low carbon steel, but the crevice corrosion exacerbates when the pH value is too high (over 8. 5).

关 键 词：均匀腐蚀 缝隙腐蚀 PH值 低碳钢 高舍盐污水 

分 类 号：TG172.5[金属学及工艺—金属表面处理]