IMMERSION TIN BATH COMPOSITION AND PROCESS FOR USING SAME

摘要

The present invention relates to a novel immersion tin plating bath composition and method of utilizing salt composition in depositing a smooth even metallic tin coating over metallic surfaces. The new plating bath composition comprises a soluble stannous salt, a mineral acid and a wetting agent and for its improved properties further contains at least two sulfur containing compound which nay be organic or non-organic. It is particularly preferred that the sulfur component comprise a mixture of alkali metal polysulfides and at least one other sulfur containing compound.