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采用恒流极化,SEM,XRD,EIS和Tafel扫描对比研究了Pb-Ag-RE合金阳极在无Cl-和含500 mg/L Cl-H2SO4溶液中的腐蚀行为和析氧行为.结果表明,Pb-Ag-RE阳极在含Cl-电解液中生成的氧化膜层出现“火山口”状孔洞,合金基底上分布着大量的腐蚀坑,呈现出明显的局部腐蚀特征.此外,Cl-的存在会减少阳极表面氧化膜层中Pb O2的含量,抑制析氧反应中间产物的生成和吸附,进而增加析氧反应传荷阻抗.因此,500 mg/L的Cl-对Pb-Ag-RE合金阳极的耐腐蚀性能和析氧活性均会造成不利影响,工业生产中应尽量降低电解液中Cl-的浓度.
The corrosion behavior and oxygen evolution behavior of Pb-Ag-RE anodes in Cl- -containing and 500 mg / L Cl-H2SO4 solutions were investigated by means of galvanostatic polarization, SEM, XRD, EIS and Tafel scanning. In the Pb-Ag-RE anode, there are “crater” -like holes in the oxide film formed in the Cl-containing electrolyte, and a large number of corrosion pits are distributed on the base of the alloy, showing obvious local corrosion characteristics. Can reduce the content of Pb O2 in the oxide layer on the surface of the anode and inhibit the generation and adsorption of intermediates in the oxygen evolution reaction and further increase the charge transfer resistance in the oxygen evolution reaction.Therefore, the effect of 500 mg / L Cl- on the Pb-Ag-RE Alloy anode corrosion resistance and oxygen evolution activity will be adversely affected, industrial production should minimize the concentration of Cl- in the electrolyte.