Corrosion resistant trivalent chromium phosphated chemical...

Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...

Reexamination Certificate

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C148S243000, C106S014110

Reexamination Certificate

active

07018486

ABSTRACT:
An acidic aqueous solution containing a water soluble trivalent chromium compound is provided with a additive for improving corrosion resistance and reducing precipitation of trivalent chromium over time. A suitable additive is nitrilotris (methylene) triphosphonic acid (NTMP).

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patent: WO 99/08806 (1999-02-01), None
patent: WO 01/92595 (2001-12-01), None

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