| 摘要 |
<p>[Object] To provide a chromium-free surface-treated galvanized steel sheet using a galvanized steel sheet, containing no chromium, and having an excellent balance of the various performances of corrosion resistance, chemical resistance, heat yellowing resistance, moldability, fingerprint resistance, conductivity, and paint adhesion in any of a flat surface portion, after alkaline degreasing, and a processing portion. [Solution] The surface-treated galvanized steel sheet includes zinc plating layers on both surfaces of the steel sheet, and further includes a two-layer film that has a specific acidic inorganic coating layer and a specific alkaline organic-inorganic composite coating layer on a front surface of the zinc plating layer, the coating weight of the acidic inorganic coating layer being between 0.01 g/m2 and 0.5 g/m2 and the coating weight of the alkaline organic-inorganic composite coating layer being between 0.5 g/m2 and 3 g/m2.</p> |
