| 摘要 |
PURPOSE:To further improve the corrosion resistance and paint adhesiveness of a chemically converted film, in a treating method using the aqueous acid solution of phosphoric acid or its salt and phytic acid or its salt, by conjunctly using a specified zirconate. CONSTITUTION:Using an aqueous acid solution prepd. by additionally mixing a hexafluorozirconate (IV) in phytic acid or its salt, phoshoric acid or its salt and a chlorate, a metal surface is chemically converted. As said hexafluorozirconate (IV), Na, K, Li and NH4 salts are illustrated. By mixing one or more of these salts, a composite chemcally converted film of iron and zirconium phosphates is formed resulting in the inprovement of corrosion resistance and paint adhesiveness. |
