COMPASSITION OF PASSION TO TREAT A METALLIC SUBSTRATE, COATED METAL ARTICLE, AND, METHOD TO PRODUCE A PASSION COATING ON A METALLIC SUBSTRATE

摘要

passivation composition for treating a metallic substrate, coated metal article, and method for producing an passivation coating on a metallic substrate in one embodiment, the invention provides a composition used to passivate a metal surface, in particular a zinciferous surface, comprising , preferably consisting essentially, above all preferably consisting of water and: (a) dissolved phosphate ions; (b) dissolved trivalent chromium ions; (c) anions dissolved from at least one complex fluoride of an element selected from the group consisting of ti, zr, hf, si, sn, al, ge and b; preferably ti, si and / or zr; (d) an optional component of dissolved free fluoride ions; (e) organic acid inhibitor, preferably comprising quaternary ammonium compounds; and, optionally (f) a ph adjustment component; and optionally organic hydroxy acids.