EFFECTS OF CHLORIDE ION ON THE ELECTRO- CHEMICAL BEHAVIOR OF Pb-Ag-RE ALLOY ANODE
Revised date: 2014-10-08
Online published: 2015-03-25
Supported by
Supported by National Natural Science Foundation of China (Nos.51204208 and 51374240), Natural Science Foundation of Hunan Province (No.13JJ1003), China Postdoctoral Science Foundation (No.2013M540638) and Fundamental Research Funds for the Central Universities of Central South University (No.2014zzts028)
Corrosion and oxygen evolution behavior of Pb-Ag-RE alloy anode has been comparatively investigated in H2SO4 solution without Cl- and with 500 mg/L Cl- by galvonostataic polarization, SEM, XRD, EIS and Tafel scanning. The results show that anodic layer on Pb-Ag-RE anode formed in electrolyte with Cl- exhibits ‘volcanic vent'-like holes, and the metallic substrate in this electrolyte shows obvious localized corrosion feature with large numbers of corrosion pits. In addition, the presence of Cl- decreases the amount of PbO2 on the surface of anodic layer. It also inhibits the formation and adsorption of oxygen evolution intermediates, and further enhances the charge transfer resistance of oxygen evolution reaction. Therefore, Cl- is detrimental to the corrosion resistance and oxygen evolution reactivity of Pb-Ag-RE alloy anode. Consequently, the Cl- concentration in electrolyte should be reduced as low as possible during industrial operation.
Xiaocong ZHONG , Liangxing JIANG , Xiaojun LÜ , Yanqing LAI , Jie LI , Yexiang LIU . EFFECTS OF CHLORIDE ION ON THE ELECTRO- CHEMICAL BEHAVIOR OF Pb-Ag-RE ALLOY ANODE[J]. Acta Metall Sin, 2015 , 51(3) : 378 -384 . DOI: 10.11900/0412.1961.2014.00548
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