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Leaching behaviour of tin with oxygen in recycled phenolsulfonic acid tin plating solutions |
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| Authors: | S-K. Kim H-J. Sohn T. Kang T.S. Kim T.Y. Kim |
| Affiliation: | (1) School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea;(2) Rolling Process Research Team, Steel Process and Automation, RIST, Pohang, 790-600, Korea;(3) Casting Technology Research Group, Technical Research Laboratories, POSCO, Pohang, 790-785, Korea |
| Abstract: | The dissolution characteristics of metallic tin with oxygen in recycled phenolsulfonic acid (PSA) tin plating bath to compensate tin consumed during the previous plating operation were investigated using electrochemical methods and leaching experiments at 30 °C. Electrochemical polarization data indicate that the diffusion of dissolved oxygen is the rate determining step and this is confirmed by leaching experiments. The sludge formed due to further oxidation of stannous ions during leaching in PSA tin plating solutions contains approximately 40 wt % Sn. |
| Keywords: | diffusion leaching polarization rate determining step tin granule |
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