Method for manufacturing tin(II) oxide powder for replenishing tin component of tin-alloy plating solution, and tin (II) oxide powder manufactured using said method

A method for manufacturing tin(II) oxide powder for replenishing a tin component of a tin-alloy plating solution comprising steps of:

• preparing an aqueous acidic solution containing Sn2+ ions;
• neutralizing the aqueous acidic solution at a liquid temperature of 30 to 50° C. and at a pH range of 6 to 8 in a nitrogen gas atmosphere by adding an aqueous alkaline solution to prepare a slurry of tin(II) hydroxide;
• dehydrating the prepared slurry in a nitrogen gas atmosphere to prepare a slurry of tin(II) oxide;
• separating the slurry of tin(II) oxide into a solid and a liquid to obtain tin(II) oxide;
• treating the obtained tin(II) oxide with an aqueous antioxidant solution having a concentration of 0.1 to 5% by mass;
• and
• vacuum drying the tin(II) oxide treated with the aqueous antioxidant solution;
• wherein
• the aqueous alkaline solution is an aqueous ammonia solution an ammonium bicarbonate solution or mixture thereof;
• and
• the antioxidant is at least one selected from the group consisting of hydroquinone, catechol, resorcinol, pyrogallol, gallic acid, glucose, galactose, fructose, ribose, xylose, maltose, lactose, hydrazine sulfate, carbohydrazide and sodium cyanotrihydroborate.