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

摘要

The purpose of and problem addressed by the present invention is the provision of a tin(II) oxide powder that is extremely soluble in an acid or an acidic plating solution, exhibits excellent storage stability in air, and can improve the antioxidant effect of Sn2+ ions in a plating solution. This method for manufacturing said tin(II) oxide powder includes the following steps: a step (11) in which an acidic aqueous solution containing Sn2+ ions is prepared; a step (12) in which a tin(II) hydroxide slurry is prepared by neutralizing the aforementioned acidic aqueous solution by adding an alkaline aqueous solution; a step (13) in which the prepared slurry is dehydrated, yielding a tin(II) oxide slurry; a step (14) in which said tin(II) oxide slurry is subjected to solid-liquid separation, yielding tin(II) oxide; a step (15) in which the obtained tin(II) oxide is treated with an antioxidant aqueous solution; and a step (16) in which the tin(II) oxide that has been treated with an antioxidant aqueous solution is vacuum-dried. This tin(II) oxide powder is suitable for the replenishment of the tin component of a tin-alloy plating solution.