| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a chromium-free surface-treated galvanized steel sheet which has excellent corrosion resistance, cleaning agent resistance such as alkali resistance and solvent resistance, adhesion such as a coating film adhesion, coating material adhesion and printing adhesion, and water resistance such as moisture resistant discoloring properties and dew condensation resistance, and also has excellent workability and sliding property. <P>SOLUTION: A water-based treating agent for metal surfaces comprises a film-forming ingredient (c) comprising, in a specific ratio, the three components of an organosilicon compound (C) that has two or more specific functional groups and one or more specific hydrophilic functional groups in the molecule and has a specific molecular weight, a water base urethane resin (E) having a specific structural unit, and a cationic phenol resin (F) having a specific structure, an inhibitor ingredient (d) comprising the four ingredients of hexafluorotitanic acid (H), hexafluorozirconic acid (I), a phosphoric acid compound (J) and a vanadium (IV) compound (K) at a specific ratio, polyethylene wax (L) and an aqueous medium with the pH of 4 to 6 is applied and dried to thereby form a composite coating film comprising the ingredients. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
