(1. 湖南城市學院 材料與化學工程學院，益陽 413000；
2. 中南大學 冶金與環(huán)境學院，長沙 410083)
摘 要: 電解鐵鎢錫合金回收鐵和富集鎢錫是一種實現(xiàn)資源綜合利用綠色可行的有效途徑，本文利用電化學手段研究了鐵鎢錫合金粉電解的陽極行為。結(jié)果表明：鐵鎢錫合金粉電解過程只有鐵發(fā)生電化學溶解，電解可實現(xiàn)鐵與鎢錫的分離，活化溶解區(qū)鐵的溶解反應為擴散步驟控制的不可逆過程，溫度升高有利于鐵的溶解。鐵鎢錫合金粉相對于鐵粉的自腐蝕電位正移了0.23 V，自腐蝕電流密度減小了86.67%，鐵鎢錫合金的陽極極化曲線斜率是鐵粉的2.31倍，極化電阻是鐵粉的6.75倍，鐵鎢錫合金粉中的鐵比鐵粉更難溶解。電流密度越大，鐵鎢錫合金越容易鈍化，在適宜的電位范圍內(nèi)，電位越正越有利于鐵的溶解。
關(guān)鍵字: 鐵鎢錫合金粉；電解；陽極行為；電化學；鈍化
（1. School of Materials and Chemical Engineering, Hunan City University, Yiyang 413000, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The electrolytic recovery of iron and enrichment of tungsten and tin from Fe-W-Sn alloy is an effective and feasible way to achieve the comprehensive utilization of resources. The anode behavior of Fe-W-Sn alloy powder electrolysis was studied using electrochemical means. The results show that only the iron is electrochemically dissolved in the electrolysis process of the Fe-W-Sn alloy powder, and the separation of iron from tungsten and tin can be achieved by electrolysis. The iron dissolution reaction in the active dissolution region is an irreversible process controlled by the diffusion step, and the increase in temperature is beneficial to the dissolution of iron. Compared with the Fe powder, the self-corrosion potential of Fe-W-Sn alloy powder is positively shifted by 0.23 V, and the self-corrosion current density is reduced by 86.67%. The slope of the anode polarization curve of Fe-W-Sn alloy is 2.31 times higher than that of Fe powder, the polarization resistance of which is 6.75 times higher than that of Fe powder, and Fe in Fe-W-Sn alloy powder is much more difficult to dissolve than Fe powder. The higher the current density, the easier the Fe-W-Sn alloy is to be passivated. Within the appropriate potential range, the more positive the potential is, the more favorable the dissolution of Fe.
Key words: Fe-W-Sn alloy powder; electrolysis; anode behavior; electrochemistry; passivation
