| 摘要 |
Aqueous acidic solutions for the production of chemical conversion coatings on aluminium and its alloys contain a hetero phospho, and/or silico polymolybdic compound, hexavalent chromium and fluorine containing compounds with an optional addition of ferro or ferricyanide. The concentration of the phospho and/or silico polymolybdic compounds can be varied to give coatings of colour varying from golden to blue. Specifications 735,819, 747,957 and U.S.A. Specifications 2,276,353 and 2,507,596 are referred to. |
