グルコン酸浴からの光沢スズ-鉛合金めっき

概要

論文の詳細を見る
The effect of the addition of EDTA complexing agent on the electrodeposition of tin-lead alloy from gluconate baths was investigated. The addition of EDTA to baths containing additives was found to suppress the preferential deposition of lead in the low current density region. Measurement of partial polarization curves for tin-lead alloy plating baths showed that the addition of EDTA to baths containing additives shifted the potential of lead deposition in the less noble direction, but had little effect on the current values for hydrogen evolution. As the concentration of sodium gluconate in the bath was increased, the lead content of deposits increased and the current efficiency decreased.When the EDTA-to-lead concentration ratio in the bath was increased, on the other hand, the lead content of the deposits decreased and the current efficiency increased.These results suggest that the formation of the complex of lead ion with gluconic acid and EDTA occurred in the solution.
社団法人表面技術協会の論文