研究了钒化合物稳定剂对酸性SnSO4 溶液稳定性的影响 .可见光谱分析表明稳定剂中主要含有VO2 + 和少量的V3+ ,循环伏安实验显示在 - 0 .2 0～ - 0 .55V(vs .SCE)电位范围内VO2 + 能够在阴极上还原为V3+ ,在更负的电位下V3+ 能进一步还原到V2 + .实验结果说明稳定剂中的低价钒离子有效地清除了镀液中的溶解氧 ,因而防止了Sn2 + 离子的氧化 ,显著地提高了酸性锡镀液的稳定性 .
The effects of a vanadium compound on the stability of an acidic solution of tin(Ⅱ) sulfate were studied . The electron spectra of the solutions of stabilizer showed that the vanadium existed mainly in VO 2+ with a small amount of V 3+ in the stabilizer. The results of cyclic voltammetry revealed that VO 2+ can be further reduced to V 3+ on the cathode surface in potential range -0.2～-0.55 V(vs. SCE) and V 3+ to V 2+ at the potential more negative than -0.55 V. Both V 3+ and V 2+ can effectively eliminate the dissolved oxygen in the bath hence prevent Sn 2+ from oxidizing, which remarkably increased the stability of the tin (II) sulfate solution.
[1] LiaoYijia .StudyoftheturbidityproblemofSn Cealloyplatingbath[J].Electroplating&PollutionControl(inChinese) ,1987,7(2 ) :15～ 18.
[2 ] FanXiao lin ,Daizhen .Anapproachofthemechanismofunstabilityofthesulphateelectroplatingbathforbrighttinplating[J].PlatingandFinishing (inChinese) ,1988,10 (4 ) :10～ 12 .
[3] LaiLong jun .StudiesonstabilizerofacidbrightSnplating[J].Electroplating&PollutionControl (inChi nese) ,1990 ,10 (2 ) :10～ 13.
[4 ] ZhangYong qiang ,Liuxing quan .Studyofthesolderabilityoftinalloyandstabilizersforacidictinplating[J].Electroplating&PollutionControl (inChinese) ,1994 ,14(4 ) :3～ 5.
[5] LiDi,GuWen bin ,TanYing heng ,etc .AstudyonadditivesinacidbrightSnplating[J].MaterialsPro tecting (inChinese) ,1994 ,2 7(9) :7～ 9.
[6 ] S .C .Furman ,C .S .Garner.AbsorptionSpectraofVanadium (Ⅲ )andVanadium (IV)ionsincomplexingandNon complexingMedia[J].J .Am .Chem .Soc .,1950 ,72 :1785～ 1797.
[7] M .PrivmanandT .Hepel.Electrochemistryofvanadiumelectrodes.Part 1.Cyclicvoltammetryinaqueoussolutions[J].JElectroanal.Chem .,1995,382 :137～ 144 .
[8] E .Tsuchida ,K .Oyaizu ,E .LDewi,ect.Anson ,CatalysisoftheElectroreductionofO2 toH2 ObyVanadi um salenComplexesinAcidifiedDichloromethane[J].Inorg .Chem .,1999,38(16 ) :370 4～ 370 8.
