摘要
采用腐蚀失重试验及电化学测试研究了三价铁离子对A508III低合金钢在25℃硼酸溶液中腐蚀与电化学行为的影响。在25℃硼酸溶液中,随着三价铁离子浓度增加,A508III钢的电化学阻抗值和线性极化电阻减小,阳极和阴极极化电流密度增大,腐蚀速率显著增大。在Fe2(SO4)3溶液中,H3BO3的加入以及其浓度的改变对电化学行为和腐蚀速率均无明显的影响。三价铁离子会加速A508III钢在硼酸溶液中的腐蚀,而当溶液中三价铁离子浓度较高时,硼酸浓度对A508III钢的腐蚀无明显影响。
The influence of ferric ions on corrosion and electrochemical behavior of A508Ⅲ low alloy steel in boric acid solutions at 25 ℃ was investigated using electrochemical measurements and weight loss measurements.Increasing Fe3＋ concentration in boric acid solution decreased the electrochemical impedance value and the linear polarization resistance,increased the current densities of anodic and cathodic polarization,and significantly increased the corrosion rate.Adding boric acid into ferric ion solutions had no any significant effect on electrochemical behavior and corrosion rate of the steel.Ferric ion would accelerate the corrosion of A508Ⅲ steel in boric acid solution.The effect of boric acid concentration on corrosion of A508Ⅲ was not significant if the concentration of ferric ion in solutions was considerably high.
出处
《腐蚀与防护》
CAS
北大核心
2015年第9期840-845,共6页
Corrosion & Protection
基金
上海市浦江人才计划(12PJ1403600)
教育部博士点基金博导类项目(20123108110021)
上海大学创新基金
关键词
低合金钢
压水堆核电站
腐蚀
硼酸
三价铁
电化学行为
low alloy steel
pressurized water reactor nuclear power plant
corrosion
boric acid
ferric ion
electrochemical behavior
