硫酸中硫脲影响铁腐蚀行为的机制  

INFLUENCE OF THIOUREA ON CORROSION BEHAVIOR OF IRON IN H_2SO_4 SOLUTION

作　　者：董俊华[1] 宋光铃[1] 林海潮[1] 曹楚南[1] 

机构地区：[1]中国科学院金属腐蚀与防护研究所

出　　处：《中国腐蚀与防护学报》1996年第1期53-58,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金

摘　　要：用近稳态极化曲线方法和交流阻抗方法研究了铁在硫脲浓度低于０．１ｍｍｏｌ／Ｌ的硫酸溶液中的腐蚀行为，获得了相关的电化学参数。结果表明，在低阳极极化区，铁阳极溶解反应的速率决定步骤是一个亲核加成反应，动力学参数为Ｖ（ＴＵ）＝１，ｂａ≈６０ｍＶ。在阴极区，析氢反应的速率决定步骤是Ｈｅｇｒｏｖｓｋｙ反应，动力学参数为：Ｖ（ＴＵ）＝０．５，Ｖ（Ｈ＋）＝１．５，ｂｃ≈－８２ｍＶ。The corrosion behavior of iron electrode in H2SO4 containing thioures(C 0.1 mmol/L)was investigated with polarization curves and EIS method.Various electrochemical parameters involved were obtained.The results showed that,the rate determining step(r.d.s)for anodic dissolution reaction of iron in low polarization region was a nucleophilic additive reaction,and the corresponding kinetics parameters were VTU=1,ba≈60mV.The r.d.s for its catbodic process was a Heyrovshky Heyrovsky reaction,and the kinetics parameters were:VTU=-0.5,VH+=1.5,bc≈-82mV.

关 键 词：硫酸 硫脲 铁 腐蚀 

分 类 号：TG172.63[金属学及工艺—金属表面处理]