Essentially chromium-free method for passivating metallic surfaces consisting of zn, zn alloys, al or al alloys
The present invention relates to a substantially chromium-free process for passivating metallic surfaces of Zn, Zn alloys, Al or Al alloys by treating the surface with an acidic aqueous formulation which comprises at least one substantially noncrosslinked, water-soluble polymer or copolymer containi...
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