Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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250 Table IV. Methane Sulfonic Acid (MSA) Bath Compositions and Operating Parametersa MSA Tin (g/L) Tin Barrel, Still, and High-Speed Baths: Range Optimum Lead Barrel and Still Baths: Range Optimum 60 Tin/40 Lead Solder Bath: Barrel and still: Range Optimum High speed: Range Optimum 90 Tin/10 Lead Barrel, Still, and High-Speed Baths: Range Optimum 93 Lead/7 Tin Barrel and Still Baths: Range Optimum 10 Tin/88 Lead/2 Copper Barrel and Still Baths: Range Optimum a 200-250 225 30-50 40 200-250 225 200-250 225 200-250 225 30-50 40 30-50 40 (g/L) 35-55 45 — Lead (g/L) — 56-72 64 12-20 16 12-20 16 17-25 21 4-5 4.5 4-5 4.5 6-10 8 8-12 10 2-4 3 56-72 64 65-75 70 Copper (g/L) — — Additive As required As required Temperature OF (O C) 70-130 (21-54) 70-100 (21-38) — — — — 0.8-1.2 1.0 Agitation required, mechanical or barrel; vigorous for high-speed plating. Platinized titanium anodes can be substituted for the soluble anodes. Periodic filtration through 1-µm Dynel or polypropylene cartridges. Anode to cathode ratios for all baths is 1:1. Tanks, pumps, and filters made from polyethylene, polyvinyl chloride (PVC), or Koroseal. Heating and cooling equipment made from Karbate or Teflon. As required As required As required As required As required 70-85 (21-29) 70-100 (21-38) 70-130 (21-54) 70-85 (21-29) 70-100 (21-38) 1-40 10 tin/88 lead/2 copper, or 90 lead/10 tin, or pure lead 1-250 1-250 1-40 60 tin/40 lead 90 tin/10 lead 93 lead/7 tin Current Density (A/ft2 1-250 1-40 ) Anodes Pure tin Pure lead 1-40 60 tin/40 lead

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