| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treated metal material superior in various characteristics, a water-dispersible metal surface treatment agent superior in storage stability therefor, and a manufacturing method therefor. SOLUTION: The water-dispersible metal surface treatment agent has 10-80 mass% of total solid contents, and comprises 40-90 mass%, in a solid content, of an ionomer resin, 1-10 mass% of a compound containing a water-soluble multifunctional epoxy group, 7-40 mass% of silica for adsorbing amino groups or ammonium ions, and 0.1-10 mass% of at least one rust inhibitor selected from thiocarbonyl compounds or ammonium vanadates. The above ionomer resin is an ethylene-unsaturated carboxylic acid polymer having a glass transition point of 50-70 deg.C, and has 40-60% of carboxyl group neutralized with a monovalent metal cation per total contained carboxyl groups. Furthermore, the above compound containing the water-soluble multifunctional epoxy group includes chlorine of less than 1 mass%.
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