| 摘要 |
A galvanized steel sheet that exhibits excellent performance, namely corrosion resistance and adhesion, and is highly conductive under low surface pressure. The surface of a galvanized steel sheet is coated with a surface-treatment solution that has a pH between 3 and 6, inclusive, and contains a mixture of the following in a specific ratio: a resin emulsion comprising a cationic urethane resin emulsion and/or a non-ionic acrylic resin emulsion; a tetraalkoxysilane; at least one silane coupling agent (c) that has at least one reactive functional group selected from among active-hydrogen-containing amino groups, epoxy groups, mercapto groups, and methacryloxy groups; a chelator (d); a vanadic acid compound (e); a titanium compound (f); and water. Said coating is then heat-dried to form a first-layer film, and a surface-treatment solution containing an organic resin is then applied to surface of the first-layer film and heat-dried to form a second-layer film. |
