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1. (WO2018065564) AQUEOUS SOLUTION AND METHOD FOR IMPROVING CORROSION RESISTANCE OF A CR(III) CONVERSION COATING AND MODIFIED CR(III) CONVERSION COATING

Pub. No.:    WO/2018/065564    International Application No.:    PCT/EP2017/075444
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Sat Oct 07 01:59:59 CEST 2017
IPC: C23C 22/83
C09D 5/08
C25D 11/24
Applicants: COVENTYA SAS
Inventors: COLL, Yoann
PONS, Marjorie
Title: AQUEOUS SOLUTION AND METHOD FOR IMPROVING CORROSION RESISTANCE OF A CR(III) CONVERSION COATING AND MODIFIED CR(III) CONVERSION COATING
Abstract:
This invention relates to an aqueous solution and a method for preparing an organic protective coating on a Cr(lll) conversion layer which is localized on (anodized) aluminium (alloy) to enhance corrosion protection. The compostion is an aqueous solution which contains water, an organic film forming agent and a corrosion inhibitor, wherein the corrosion inhibitor comprises or consists of at least one 2‐arylriazole. According to the method of the present invention, the composition is used for post‐treating of a Cr(lll) conversion layer on (anodized) aluminium (alloy). The invention further provides a modfied Cr(III) conversion coating on (anodized) aluminium (alloy), which is producible or produced with the inventive method. The modified Cr(III) conversion coating according to the invention shows excellent corrosion protection, paint adhesion and electrical resistivity.