Studies of the corrosion inhibition of copper in Na2SO4 solution using polarization and electrochemical impedance spectroscopy
Studies of the corrosion inhibition of copper in Na2SO4 solution using polarization and electrochemical impedance spectroscopy
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DOI：
10.1016/j.matchemphys.2009.12.044
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发表时间：
2010-05
影响因子：
4.6
通讯作者：
E. Hamed
中科院分区：
文献类型：
--
作者：
E. Hamed
采用动电位极化曲线和电化学阻抗谱技术，研究了不同浓度的绿色缓蚀剂叶酸钾在15-55°C的Na 2SO 4溶液中对铜的缓蚀作用。极化曲线表明，叶酸钾的加入抑制了铜的腐蚀，这是由于叶酸阴离子在铜表面的物理吸附。叶酸阴离子作为阳极型抑制剂。抑制效率随叶酸浓度的增加而增加，随Na 2SO 4浓度的增加和温度的升高而降低。叶酸在铜表面的吸附符合Flory-Huggins吸附等温式和动力学-热力学模型。计算了缓蚀剂存在和不存在时的腐蚀和吸附过程的热力学参数，并进行了讨论。考察了浸泡时间对缓蚀剂缓蚀性能的影响。
Inhibition effect of different concentrations of potassium folate (green inhibitor) on copper corrosion in aerated Na2SO4solutions in the temperature range (15–55°C) was investigated by using potentiodynamic polarization and electrochemical impedance spectroscopy technique. The polarization curves showed that the addition of potassium folate inhibits copper corrosion as a result of physical adsorption of folate anions on the copper surface. The folate anion acts as an anodic-type inhibitor. The inhibition efficiency increases with increasing the folate anion concentration but decreases with increasing Na2SO4concentration and temperature. The adsorption of folate anions on copper surface follows Flory–Huggins isotherm and kinetic–thermodynamic model. The thermodynamic parameters for corrosion and adsorption processes in the absence and presence of the inhibitor were calculated and discussed. Effect of immersion time on the performance of the inhibitor was also tested in this investigation.