STANNOUS OXIDE POWDER FOR REPLENISHING TIN COMPONENT FOR TIN-ALLOY PLATING SOLUTION AND PROCESS FOR PRODUCING THE POWDER

摘要

PROBLEM TO BE SOLVED: To provide a stannous oxide powder which has a high solubility to acid or acidic plating solutions and an excellent storage stability in the atmosphere, and a process for producing the same.

SOLUTION: The stannous oxide powder is used for replenishing the tin component in tin alloy plating solutions. The powder contains 100-5,000 ppm by mass of an antioxidant, and has such a rate of solubility that the powder dissolves within 180 seconds, when 0.1 g of the powder is added to and mixed with 100 ml of an aqueous solution of 100 g/L alkyl sulfonic acid at 25°C.

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