(1. 重慶大學(xué) 化學(xué)化工學(xué)院，重慶 400044；
2. 湖北興福電子材料有限公司，宜昌 443711；
3. 西南科技大學(xué) 固體廢物處理與資源化教育部重點(diǎn)實(shí)驗(yàn)室，綿陽 621010)
摘 要: 采用雙向脈沖電沉積法制備金屬錳，研究雙脈沖電源的正向平均電流密度、反向脈沖系數(shù)、一組正向脈沖工作時(shí)間和反向脈沖工作時(shí)間系數(shù)對(duì)電流效率、單位功耗、陰極金屬錳和陽極泥的微觀形貌的影響。結(jié)果表明：雙脈沖電流可有效消除濃差極化，抑制析氫反應(yīng)，反向電流可溶解鍍層表面的枝晶；脈沖參數(shù)過高或者過低都會(huì)造成金屬錳層微觀缺陷不斷增加，鍍層表面平整度與光亮度下降；而反向周期性電流的增大或者施加時(shí)間的延長可有效地防止陽極鈍化，減少陽極泥的產(chǎn)生量。雙脈沖電源的優(yōu)化參數(shù)為：當(dāng)正向平均電流密度為350 A/m2、反向脈沖系數(shù)α=1/10、一組正向脈沖工作時(shí)間為150 ms、反向脈沖工作時(shí)間系數(shù)為1/15時(shí)，電沉積2 h的電流效率最高為80.25%，陽極泥的產(chǎn)生量最低為2.93 g，而且金屬錳鍍層致密均勻、氣孔少、基本無枝晶產(chǎn)生。
關(guān)鍵字: 雙向脈沖電沉積；電解金屬錳；電流效率；微觀形貌
（1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2. Hubei Sinophorus Electronic Materials Co., Ltd., Yichang 443711, China;
3. Key Laboratory of the Ministry of Education of Solid Waste Disposal and Resources, Southwest University of Science and Technology, Mianyang 621010, China）
Abstract:The preparation of electrolytic manganese metal by bidirectional pulse electrodeposition was studied, the influence of positive average current density, reverse pulse coefficient, a set of forward pulse working time and reverse pulse working time coefficient on current efficiency, unit energy consumption, micro-morphology of the cathode metal manganese and the anode mud were investigated. The results show that bipolar pulse current can effectively eliminate the concentration polarization, inhibit the hydrogen evolution reaction, and dissolve the dendrite on the surface of the coating. Moreover, the irrationality of pulse parameter will cause the metal manganese layer micro defects increasing, coating surface smoothness and brightness decreasing, while the extended of average current density or the applied time can effectively prevent the anode passivation and reduce production of anode slime. The optimal parameters of bidirectional pulse are as follows: the current efficiency achieves 80.25% and the quality of anode mud is 2.93 g, when positive average current density is 350 A/m2, reverse pulse coefficient is 1/10, a set of forward pulse working time is 150 ms and reverse pulse working time coefficient is 1/15. Moreover, the metal manganese coating is dense and uniform, with few stomata and almost no dendrite formation.
Key words: bidirectional pulse electrodeposition; electrolytic manganese metal; current efficiency; micro-morphology
