研究了Cl-对碳钢和不锈钢在(K2CO3+KHCO3+ V2O5)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0.064 mm/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(K2CO3+KHCO3)溶液中构成电偶腐蚀时,测得碳钢腐蚀速率为4.0 mm/a,比含有V2O5溶液中碳钢的腐蚀速率大64倍.
Effects of Cl- on corrosion of carbon steel and stainless steel in K2CO3+KHCO3+V2O5 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 40mm/a in K2CO3+KHCO3 solution,which is 64 times as much as that in K2CO3+KHCO3 +V2O5 solution.
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