| 摘要 |
<p>A chemical conversion solution contains greater than 18 to 200 g/L or less of aluminum phosphate monobasic and has a pH of 1.5 to 2.4. A method for producing a tinned steel sheet includes forming an Sn-containing plating layer on at least one surface of a steel sheet such that the mass per unit area of Sn is 0.05 to 20 g/m 2 , immersing the steel sheet in the chemical conversion solution or cathodically electrolyzing the steel sheet at a current density of 10 A/dm 2 or less in the chemical conversion solution; and drying the steel sheet to form a chemical conversion coating. Since the method uses the chemical conversion solution, the following sheet can be produced: a tinned steel sheet that is capable of preventing the deterioration of appearance and the reduction of paint adhesion due to the surface oxidation of a tin plating layer without using Cr, which causes environmental problems, and that can be subjected to chemical conversion at low cost.</p> |
