摘要
针对不同浓度十六烷基三甲基溴化铵(CTAB)对SA210C钢在两种酸性模拟溶液中的缓蚀效果,采用动电位扫描曲线与电化学阻抗谱(EIS)方法分析了不同条件下SA210C钢电化学腐蚀特征,计算了不同浓度缓蚀剂的缓蚀效率(IE,%),研究了pH值和缓蚀剂对腐蚀速率的影响。结果表明:未添加缓蚀剂时,SA210C钢在pH=6.5模拟溶液中自腐蚀电位较在pH=5.5溶液中更正,但腐蚀电流密度有所下降;添加缓蚀剂后,SA210C钢在相同pH值下自腐蚀电位和腐蚀电流密度均呈现先减小后增大趋势,缓蚀剂添加量为60 mg/L时缓蚀效率达到最高值75.60%。pH值降低时,SA210C钢容抗弧半径减小,减小趋势与规律同极化曲线所得规律一致。因此,未添加缓蚀剂时,SA210C钢在酸性环境中表现为活性溶解状态;与pH=5.5溶液相比,SA210C钢在pH=6.5溶液中腐蚀倾向高但腐蚀速率较缓慢。随着CTAB添加量的增加,其对SA210C钢在酸性环境中的缓蚀效果呈现先增大后减小趋势,缓蚀剂浓度为60 mg/L时有最佳缓蚀效果,继续添加至80 mg/L后,缓蚀效果显著下降。
This work investigates the corrosion inhibition effect of different concentrations of cetyltrimethylammonium bromide(CTAB)on SA210C steel in two acidic simulated solutions.The electrochemical corrosion characteristics of SA210C steel under different conditions were analyzed by potentiodynamic polarization(PDP)curves and electrochemical impedance spectroscopy(EIS),and the corrosion inhibition efficiencies were calculated for different concentrations of corrosion inhibitors,and the effects of pH and corrosion inhibitor on corrosion rate were also analyzed.It was found that when no corrosion inhibitor was added,the self-corrosion potential of SA210C steel in the simulated solution at pH 6.5 was more positive than that in the solution at pH 5.5,but the corrosion current density decreased.After the addition of a corrosion inhibitor,the self-corrosion potential and the corrosion current density of SA210C steel showed a trend of decreasing and then increasing under the same pH.The corrosion inhibition efficiency reached a maximum of 75.60%with the addition of an inhibitor of 60 mg/L.The corrosion inhibition efficiency(IE,%)of different concentrations of corro‐sion inhibitors was calculated,and the analysis of the effect of pH and inhibitor on the corrosion rate was also conducted,resulting in 75.60%.As the pH value decreases,the arc radius capacity of the SA210C steel decreases,showing a decreasing trend and following the same law as the polarization curve obtained.The results show that when no corrosion inhibitor is added,SA210C steel exhibits an active dissolution state in an acidic environment.Compared to a solution of pH5.5,corrosion tendency of SA210C steel is high in a solution of pH6.5,but the corrosion rate is slow.With the increase of CTAB additive amount,its corrosion inhibition effect on SA210C steel in an acidic environment showed a trend of increasing and then decreasing.The corrosion inhibitor concentration of 60 mg/L has the best corrosion inhibition effect,and continues to decrease significantly when a
作者
毛晓飞
刘宣义
刘帅岐
徐媛媛
黄世福
董雪峰
何华林
刘光明
Mao Xiaofei;Liu Xuanyi;Liu Shuaiqi;Xu Yuanyuan;Huang Shifu;Dong Xuefeng;He Hualin;Liu Guangming(Wuhan Branch of National Energy Group Science and Technology Research Institute Co.,Ltd.,Wuhan 430070,China;School of Material Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;Chengdu Nuo Jia Weiye Technology Co.,Ltd.,Chengdu 611330,China)
出处
《电镀与精饰》
CAS
北大核心
2024年第11期9-16,共8页
Plating & Finishing
基金
国家自然科学基金项目(51961028)。
关键词
SA210C钢
CTAB
缓蚀剂
酸性环境
电化学测试
腐蚀
SA210C steel
cetyltrimethylammonium bromide(CTAB)
corrosion inhibitor
acidic environment
electrochemical test
corrosion
