| 摘要 |
<p>A method for producing a tinned steel sheet includes forming an Sn-containing plating layer on at least one surface 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 a chemical conversion solution which contains greater than 18 to 200 g/L or less of aluminum phosphate monobasic and which has a pH of 1.5 to 2.4 or cathodically electrolyzing the steel sheet at a current density of 10 A/dm 2 or less in the chemical conversion solution, forming a chemical conversion coating in such a manner that the steel sheet is washed with water and is then dried, and then forming a product of the reaction with a silane coupling agent such that the mass per unit area is 0.10 to 100 mg/m 2 in terms of Si. According to the method, the following sheet can be obtained: a tinned steel sheet which 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 and which can be subjected to chemical conversion at low cost.</p> |
