A3钢在碱性NaCl体系中闭塞电池腐蚀的研究  

Study of occluded cell corrosion of A3 steel in alkali NaCl solution

作　　者：许淳淳[1] 张晓波[1] 刘幼平[1] 

机构地区：[1]北京化工大学应用化学系,北京100029

出　　处：《北京化工大学学报（自然科学版）》2000年第2期52-55,共4页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金! ( 5970 1 0 0 9);金属腐蚀与防护国家重点实验室资助项目

摘　　要：用模拟闭塞电池法研究了A3钢在 0 0 1 (mol·L- 1 )NaCl( pH =1 2 0 0 )溶液中闭塞区内化学状态的变化。结果表明 ,随着阳极极化时间的延长 ,闭塞区溶液的 pH值下降 ,开始时下降较快 ,Cl- 向闭塞区内迁移 ,闭塞溶液的[Cl- ]与极化时间成直线关系。在不同 pH值下的NaCl溶液中的极化曲线测试结果表明 ,当 pH值大于 1 1时 ,A3钢极化曲线阳极区出现明显的钝化 ,可见 ,在 pH值大于 1 1的体系中 ,A3钢发生局部腐蚀的倾向更大。A simulated occluded corrosion cell (OCC) was used to study chemical changes within corrosion cracks or crevices of mild steel (A3) in 0 01(mol·L -1 ) NaCl solution at 50 ℃. It has been found that as the anodic current passes through the cell,the pH value falls quickly at the beginning, then slowly down to about 4 55. Meanwhile Cl - migrates into the occluded cell,and the Cl - concentration is proportional to polarization time. Polarization curves show that in solutions with a pH value above 11, obviously visible localized corrosion occurs to A3 steel.

关 键 词：局部腐蚀 氯化钠 模拟闭塞电池 腐蚀行为 低碳钢 

分 类 号：TG172.63[金属学及工艺—金属表面处理] TG172.4[金属学及工艺—金属学]