氨性硫代硫酸盐体系中金溶解过程的腐蚀电化学行为

An Corrosion Electrochemical Study on Leaching of Gold in Ammoniacal Thiosulfate Solutions

为了研究氨性硫代硫酸盐浸金体系中金溶解过程的电化学行为,采用Tafel极化曲线分析法,考察了S2O2-3氨、Cu2+EDTA和CMC对金的腐蚀电位和腐蚀电流密度的影响.结果表明一定浓度的S2O2-3、氨、Cu2+和一定量的EDTA、CMC均使金的腐蚀电位(Ecorr)降低,表明金容易被溶蚀;腐蚀电流密度(Jcorr)增大,极化电阻(Rp)减小,表明金溶蚀速率加快.

Electrochemical behavior and kinetics of gold dissolution in ammoniacal thiosulfate solutions are inves-tigated by Tafel polarization curve analysis.The effect of thiosulfate concentration,ammoniacal concentration, copper （Ⅱ ）concentration,ethylenediaminetetraacetic acid （EDTA ）concentration,carboxymethyl cellulose （CMC）concentration on the corrosion current density and corrosion potential is also investigated in this paper. The results show that the corrosion potential and resistance is decreased and the corrosion current density is in-creased when the thiosulfate concentration,ammoniacal concentration ,copper（Ⅱ）concentration,EDTA con-centration ,CMC concentration is kept in a certain level,which indicates that the dissolution rate of pure gold in the leaching system is enhanced.