柠檬酸/酒石酸-锡酸盐电镀低锡青铜

柠檬酸/酒石酸-锡酸盐电镀低锡青铜 ELECTRODEPOSITION OF LOW TIN BRONZE FROM CITRIC ACID/TARTARIC ACID-STANNATE BATH 黄清安 Huang Qingan Zuo Zhengzhong Chen Yongian Song Yuxiu Zou Yunzhen Chen Huanchai 1 first-author 左正忠 1 陈永言 1 宋毓秀 1 邹云珍 1 陈环钗 1 日用五金工业科研所 日用五金工业科研所 < 正 > 曾有从酸性镀槽和碱性镀槽无氰电镀低锡青铜的报导[1][2] [3],而柠檬酸/锡酸盐镀低锡青铜的报导较少。1975年R·K Dube等人报导了在含有柠檬酸盐或酒石酸盐的镀槽中获得粉末状的沉积物的可能性[4] 。同年国内也报导了这方面的研究工作[5]。但是,还存在着电流密度低,阳极容易钝化,镀液稳定性较差等问题。为了解决这些问题,我们在柠檬酸/锡酸盐体系中加入辅助络合剂酒石酸和光亮剂甘油,从而找到了一种较好的"柠檬酸/酒石酸—锡酸盐电镀低锡青铜"的新体系。镀液稳定,成分简单,配制方便。阴极电流密度较高（搅拌时D K =0.75～3.0A/dm 2 ）,阳极能正常溶解。阴极电流效率接近100%。当温度在25～45℃之间、pH值在8.5～10.5之间变化时都可获得含锡量大于8%的铜锡合金镀层。钢铁零件可 The electrodeposition of low tin bronze from citric acid-stannate bath containing tartaric acid and glycerine was investigated by measuring the polarization of bronze deposition and the influnce of tartaric acid on the dissolution of alloy anode. The adsorption of tartaric acid and glycerine on electrode was also studied by method of differential capacity measurement. Experimental results indicated that the allowable cathodic current density increases as the concentration of Cu ++ increases or concentration of citric acid decreases. When tartaric acid（15g/L.）is added to the bath, the cathodic polarization becomes higher. Under optimum conditions fine deposition and normal dissolution of anode could be achieved. Stability of the bath was also improved. 1980-03-01 2021-04-01 3