摘要
采用线性扫描伏安法和循环伏安法研究了304不锈钢在FeCl3酸性溶液中的腐蚀行为。结果表明:相同pH及Cl-浓度下,随着Fe^3+浓度增加,304不锈钢自腐蚀电位正移,自腐蚀电流密度增加。304不锈钢在酸性Fe^3+溶液中发生腐蚀时,由于Fe^3+还原反应的存在导致不锈钢自腐蚀电位正移,从而使电极表面H+还原反应难以进行;当Fe^3+含量充足时,不锈钢腐蚀过程中阴极反应主要为Fe^3+还原反应,而不是H+去极化反应。因此在研究不锈钢点蚀行为时,要充分考虑到蚀孔周围Fe^3+的作用。
The corrosion behavior of 304 stainless steel in acidic FeCl3 solution was studied by linear sweep voltammetry and cyclic voltammetry.The results show that the free-corrosion potential of 304 stainless steel shifts positively and the free-corrosion current density increases with the increase of Fe^3+concentration at the same pH and Cl-concentration.When 304 stainless steel is corroded in acidic Fe^3+solution,the free-corrosion potential of stainless steel is positively shifted due to the presence of Fe^3+reduction reaction,which makes it difficult for H+reduction reaction to carry out on the electrode surface.When Fe^3+content is sufficient,the cathodic reaction in stainless steel corrosion process is mainly Fe^3+reduction reaction,not H+depolarization reaction.Therefore,it should be fully considered the effect of Fe^3+on pits growth in the study of pitting corrosion behavior of stainless steel.
作者
张浩
杜楠
周文杰
王帅星
赵晴
ZHANG Hao;DU Nan;ZHOU Wenjie;WANG Shuaixing;ZHAO Qing(National Defense Key Discipline Laboratory of Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2020年第6期517-522,共6页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51561024).
关键词
304不锈钢
点蚀
循环伏安曲线
动电位极化
Fe3+还原
304 stainless steel
pitting corrosion
cyclic voltammetry
linear sweep voltammetry
Fe^3+reduction reaction
