| 摘要 |
The present invention relates to a chrome-free passivating solution, which has the following components: effective amount of oxysalts of transition metals, inorganic acids and water. Said oxysalts of transition metals are selected from a group of oxysalts containing titanium, oxysalts containing zirconium, oxysalts containing hafnium, oxysalts containing vanadium, oxysalts containing niobium, oxysalts containing tantalum, oxysalts containing molybdenum, oxysalts containing tungsten, oxysalts containing manganese, oxysalts containing technetium, and oxysalts containing rhenium, and the ratio between said oxysalts of transition metals and inorganic acids is in the range of 200~400:1. Further, said chrome-free passivating solution may comprise one or more complexing agents. The problem that noxious chrome of sexavalence and trivalence is present in the galvanizing coat and passivating solution of the prior art is solved substantially by the passivating solution of the present invention, and the said passivating solution of the present invention can replace really the passivating solution containing sexavalence and trivalence chrome of prior art, to complete the passivation of electrogalvanized and hot galvanizing coat.
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