| 摘要 |
An object and a problem of the present invention is to provide tin (II) oxide powder which has extremely high solubility in an acid or an acidic plating solution and excellent in storage stability in the air. The tin (II) oxide powder of the present invention is for replenishing a tin component of a tin-alloy plating solution, and comprises 100 to 5000 ppm of an antioxidant being contained in the powder with a mass ratio, and has such a dissolution rate that when 0.1 g of the tin (II) oxide powder is added to 100 ml of 100 g/L aqueous alkylsulfonic acid solution at a temperature of 25° C. and stirred, then the powder dissolves therein within 180 seconds. |
