几种无机阴离子的电迁移及其对闭塞区的影响  

MIGRATION OF VARIOUS INORGANIC ANIONS AND THEIR EFFECTS ON OCCLUDED CORROSION CELL

作　　者：许淳淳[1] 傅晓萍[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：《腐蚀科学与防护技术》2000年第3期130-133,共4页Corrosion Science and Protection Technology

基　　金：国家自然科学基金 !(No.5970 10 0 9);金属腐蚀与防护国家重点实验室资助项目

摘　　要：用模拟闭塞电池方法研究了低碳钢 碱性NaCl水溶液体系中几种无机阴离子向闭塞区的电迁移规律及其对闭塞区的影响 .结果表明 :在所选阴离子浓度范围内 ,CrO2 -4、MoO2 -4、WO2 -4均能向闭塞区内迁移 ,它们遵循相同的规律 ,电迁移量随着时间的延长和浓度的提高而增大 ,其中WO2 -4迁移速度比CrO2 -4、MoO2 -4小 ;添加一定浓度以上的这三种离子能有效地阻止Cl-向闭塞区的迁移 ,浓度越高 ,效果越明显 ,其中CrO2 -4更能有效地抑制Cl-的电迁移 ;CrO2 -4和MoO2 -4均能促使闭塞区溶液pH值降低 ,其中CrO2 -4的作用尤为显著 ,而WO2Simulated occluded cells were used to study the migration of inorganic anions such as CrO 2- 4、MoO 2- 4、WO 2- 4 and their effects on occluded corrosion of mild steel (A3) in 0.01mol/L NaCl solution at 50℃.It was found that with anodic currents passing the cell, all the anions migrated into the occluded cell. The quantity of migration increased with the time and the concentration, and WO 2- 4 was the slowest. They can retard the migration of Cl - effectively above a certain concentration, The higher the concentration, the more efficient they were, CrO 2- 4 was the best.CrO 2- 4 and MoO 2- 4 caused pH fall faster. The effect of CrO 2- 4 was distinctly, while WO 2- 4 had the effect of retarding pH fall.

关 键 词：电迁移 阴离子 闭塞电池 低碳钢 

分 类 号：TG174.41[金属学及工艺—金属表面处理]