目的 研究镀液组成对电沉积添加剂协同作用的影响。方法 将阴离子表面活性剂辛基酚聚氧乙烯醚硫酸钠（OPES）与阳离子表面活性剂十二烷基二甲基苄基溴化铵（BDDAB）等摩尔混合，以该阴阳组合体系作为添加剂，考察锡电沉积中镀液组成对添加剂协同作用的影响。通过测量镀层的碳含量和电镀过程的电流效率，了解阴阳组合体系添加剂对电沉积的调控性能。结果 镀液中甲基磺酸浓度为0.5 mol/L时，OPES-BDDAB混合表面活性剂的抑制效率达到最大值（71.5%）。抑制效率随锡离子浓度的增加而增加，达到0.1 mol/L后，抑制效率增加减缓。阴阳离子表面活性剂的配比随阳离子浓度所占比例的减小而增大，抑制能力变差。OPES-BDDAB混合体系在浓度为CMC值（0.15 mmol/L）时得到镀层的碳含量最小（41.2 mg/L），且电流效率最大（96%）。结论 镀液组成影响阴阳离子组合体的协同作用效果。碳含量及电流效率的测定结果表明，通过添加剂分子间的相互作用形成一定的协同作用能力，有可能改善镀层的质量及对电镀过程的调控能力。

The work aims to study effect of electrolyte composition on synergy of electrodeposition additives. An anionic surfactant-sodium octylphenol ethoxylate sulfate (OPES) was mixed with a cationic surfactant - dodecyldimethylbenzylammonium bromide (BDDAB) to make the mixed anionic-cationic surfactant as an additive. The effects of electrolyte composition on the synergy of additives were investigated in electrochemical method. Control performance of the mixed anionic-cationic additive on electrodeposition was understood by measuring carbon content and current efficiency. Inhibition efficiency of OPES-BDDAB mixed surfactant reached the maximum (71.5%) when the concentration of methanesulfonic acid in the electrolyte was 0.5 mol/L. The inhibitory efficiency increased with increase of Sn ion concentration, and the increase slowed down after the Sn ion concentration amounted to 0.1 mol/L. The proportion of anionic and cationic surfactants increased with the decrease of proportion of cationic concentration, and the inhibitory ability was poor. The carbon content of OPES-BDDAB mixture was the lowest (41.2 mg/L) and current efficiency (96%) was the maximum at the concentration of CMC (0.15 mmol/L). The electrolyte composition has effects on the synergy of anionic-cationic complex. Measurement results of carbon content and current efficiency show that both plating quality and control capacity over electroplating process can be improved by certain synergy produced by intermolecular interaction in the additives.