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Alkaline Tin Additive #7 Process

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Additive #7 is manufactured by a new process for control of a conventional alkaline tin plating bath.

Regular addition-s of Additive #7 always produce matt-white plated quality parts. It is simple to control, and the lab technicians time is minimal.

Using Additive #7, plating costs are lowered substantially compared to an insoluble anode system or acid tin plating bath. Additive #7 even reduces the cost of operating a common alkaline stannate bath.

Additive #7 is most frequently used where automatic metering equipment is employed to maintain stable tin bath conditions.

Conventional alkaline tin bath is the lowest cost tin plating process. However, this bath is hard to control and does not produce uniform quality plating; free potassium hydroxide and stannite generation is a major problem. Green anode film is also hard to control- For these reasons many companies have changed to an insoluble anode system, which costs about 40# more than the soluble tin anode system. Many have changed to bright acid systems, which are about 100% higher in cost.

Acid tin plating systems are very sensitive to metallic contamination, which necessitates bath dumpings.

For alkaline tin baths, regular additions of Additive #7 maintains a stable free potassium hydroxide level, elininates stannite generation easy to control tin anode film.

Additive #7 stabilizes the milky white bath which reduces usage of potassium stannates. Tin stripping is virtually non-existent because black or blotchy plating is eliminated even at a low current density of 2-5 ampere per square foot in barrel plating. Tin anode clean up from troubled baths is greatly reduced.

Cost savings are from 5% - 15% lower even when using a normal alkaline soluble tin anode bath. These reductions are because bath operation labor is reduced, potassium stannnate additions are reduced as are other additives, and reduced stripping cost.

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