Inhibition of copper corrosion in acidic chloride pickling solutions by 5-(3-aminophenyl)-tetrazole as a corrosion inhibitor
Inhibition of copper corrosion in acidic chloride pickling solutions by 5-(3-aminophenyl)-tetrazole as a corrosion inhibitor
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DOI：
10.1016/j.corsci.2008.10.002
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发表时间：
2008-12-01
影响因子：
8.3
通讯作者：
Comins, J. D.
中科院分区：
文献类型：
--
作者：
Sherif, El-Sayed M.;Erasmus, R. M.;Comins, J. D.
采用动电位极化曲线、计时电流法、电化学阻抗谱、失重法和拉曼光谱研究了5-（3-氨基苯基）-四氮唑（APT）对铜在0.5 M HCl酸洗溶液中的缓蚀作用。电化学测试结果表明，APT的存在和其浓度的增加显着降低阴极，阳极和腐蚀电流以及腐蚀速率。这种效应也降低了铜在200 mV时的溶解电流（与Ag/AgCl相比），并大大增加了表面电阻和极化电阻以及抑制效率，如CA和EIS测量所示。失重数据表明，铜的腐蚀速率降低到最低限度，并在APT的存在下，其浓度增加后，即使在72小时的铜片浸泡的缓蚀效率增加到最大值。将铜在含有1.0 mM APT的HCl溶液中浸泡72小时后在铜表面上获得的拉曼光谱与单独固体APT获得的光谱进行比较，表明APT分子通过吸附到铜表面上来抑制铜的腐蚀。(C)2008爱思唯尔有限公司保留所有权利。
Inhibition of copper corrosion in acidic chloride pickling (0.5 M HCl) solutions by 5-(3-Aminophenyl)-tetrazole (APT) as a corrosion inhibitor has been studied using potentiodynamic polarization, chronoamperometry (CA), electrochemical impedance spectroscopy (EIS), weight-loss and Raman spectroscopy investigations. Electrochemical measurements showed that the presence of APT and the increase of its concentration significantly decrease the cathodic, anodic, and corrosion currents as well as corrosion rates. This effect also decreases the dissolution currents of copper at 200 mV vs. Ag/AgCl, and greatly increases surface and polarization resistances and inhibition efficiency as indicated by CA and EIS measurements. Weight-loss data revealed that the corrosion rate of copper decreases to a minimum and the inhibition efficiency increases to a maximum in the presence of APT and upon increasing of its concentration even after 72 h of copper coupons immersion. Comparing the Raman spectrum obtained on the copper surface after its immersion in HCl solution containing 1.0 mM APT for 72 h to the spectrum obtained for the solid APT alone indicated that APT molecules inhibit the corrosion of copper via their adsorption onto its surface. (C) 2008 Elsevier Ltd. All rights reserved.