电化学法研究碳钢在草酸中的钝化行为  

Electrochemical measurements study the passivation behavior of carbon steel in oxalic acid

作　　者：王林[1] 仵茜[1] 梅玲[1] 赵慧敏[1] 谷宁[1] 李春梅[1] 

机构地区：[1]河北师范大学化学与材料科学学院,河北石家庄050024

出　　处：《河北省科学院学报》2015年第1期43-46,共4页Journal of The Hebei Academy of Sciences

基　　金：河北省自然科学基金(B2011205079)项目资助

摘　　要：采用极化曲线和电化学阻抗谱(EIS)测试了25℃时,碳钢在3%草酸体系中的阳极极化行为。结果表明:碳钢在草酸溶液存在明显的钝化、点蚀、活化过程,且维钝电流密度小,稳定钝化区范围宽;在钝化区内固定的电位范围内出现电流震荡现象;添加缓蚀剂PASP,腐蚀氧化峰电流及维钝电流均降低,钝化区变宽;在不同的附加电位下,碳钢的阻抗谱与阳极极化曲线显示了对应的阶段特征。Polarization curve and electrochemical impedance spectroscopy （EIS） were adopted to study at 25℃ anodic polarization behavior of carbon steel in 3% oxalic acid system .T he re‐sults showed that the obvious passivation、pitting corrosion and activation process of carbon steel in oxalic acid solution ,in passivation zone ,passive current density w as small ,stable and wide range of potential ;The potential in passivation zone within fixed appeared current shock phenomenon ;Adding corrosion inhibitor PASP ,The corrosion oxidation peak current and keep the passivation current w as reduced ,passivation zone w as w idened ;U nder each additional potential ,electrochemical impedance spectroscopy and anode polarization curve of Carbon steel showed the different stages of the corresponding characteristics .

关 键 词：碳钢 草酸 钝化 电化学阻抗谱 聚天冬氨酸 

分 类 号：O646.6[理学—物理化学]