| 摘要 |
Treatment solution for producing black chromium- and cobalt-free conversion layers, comprises: (a) at least one complex, water-soluble metal cation selected from oxo cations of the formula M' cd +>, and/or complex halogen ions of the formula M''X ab ->; (b) at least one oxidant; and (c) at least one organic sulfur compound. Treatment solution for producing black chromium- and cobalt-free conversion layers, comprises: (a) at least one complex, water-soluble metal cation selected from oxo cations of the formula M' cd +>, and/or complex halogen ions of the formula M''X ab ->; (b) at least one oxidant; and (c) at least one organic sulfur compound selected from compounds of the Formula 1: HS-R 1>-COOR 2>, and Formula 2: R 5>OOC-R 3>-S-S-R 4>-COOR 6>. c : an integer from 1-3; d : an integer from 1-3; X : selected from F, Cl, Br and I; a : an integer from 3-6; b : an integer from 1-4; and M' and M'' : selected from Mn, V, Ti, W, Mo, Zr, B, Si and Al. R 1> : selected from 1-8C-alkyl, linear and branched, and aryl; R 2> : selected from H, NH 4 +>, Li +>, Na +>, K +>and 1-4C-alkyl, linear and branched; R 3>and R 4> : selected independently from 1-8C-alkyl, linear and branched and aryl; and R 5>and R 6> : selected independently from H, NH4 4 +>, Li +>, Na +>, and 1-4C-alkyl, linear and branched. |
