氯离子和电偶腐蚀对碳钢在热钾碱溶液中腐蚀的影响  

EFFECT OF Cl^- AND GALVANIC CORROSION ON PERFORMANCE OF CARBON STEEL IN HOT POTASSIUM CARBONATE SOLUTION

作　　者：陈步荣[1] 马骏[1] 鲍春生[1] 朱一帆[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《腐蚀科学与防护技术》2003年第6期331-333,共3页Corrosion Science and Protection Technology

摘　　要：研究了Cl- 对碳钢和不锈钢在 (K2 CO3 +KHCO3+V2 O5 )溶液中腐蚀的影响 ,结果表明Cl- 对阳极钝化曲线所示的腐蚀电位、钝化区间、过钝化电位和析氧过程无明显影响 ,未见试样有孔蚀的迹象 .但随着Cl- 离子浓度增大 ,其维钝电流密度也增大 .90℃时 ,不锈钢 -碳钢在此溶液中构成电偶腐蚀时 ,测得碳钢腐蚀速率为 0 .0 64mm /a ,比未成偶对时碳钢的腐蚀速率大一倍 .90℃时 ,将已钝化的不锈钢 -碳钢在 (K2 CO3 +KHCO3)溶液中构成电偶腐蚀时 ,测得碳钢腐蚀速率为 4.0mm/a ,比含有V2 O5 溶液中碳钢的腐蚀速率大Effects of Cl - on corrosion of carbon steel and stainless steel in K 2CO 3+KHCO 3+V 2O 5 solution are studied.The results show that,from anodic passivation curve,Cl - has no obvious effect on corrosion potential,ranges of passivation,transpassive potential,and oxygen evolution. No pitting corrosion has been found in this experiment.However with the increase of Cl - concentration,the passivation current density increases,too.In comparison with the single carbon steel,the corrosion rate of carbon steel/stainless steel couple at 90℃ in this solution is 0.064mm/a,which is double as much as the former's.The corrosion rate of carbon steel of passivated carbon steel/stainless steel couple is 4 0mm/a in K 2CO 3+KHCO 3 solution,which is 64 times as much as that in K 2CO 3+KHCO 3 +V 2O 5 solution.

关 键 词：碳钢 不锈钢 氯离子 电偶腐蚀 热钾碱溶液 合成氨 再沸器 

分 类 号：TQ113.25[化学工程—无机化工] TG172[金属学及工艺—金属表面处理]