C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/68 (2006.01) C23C 22/56 (2006.01) C23C 22/66 (2006.01)
Patent
CA 2152824
An aqueous liquid chromate free composition for forming a protective coating on metals, particularly aluminum, is made by reacting cobalt (II) cations, carboxylate anions, at least one other type of coordinate complexing agent for cobalt (III) cations, and an oxidizing agent in an aqueous solution in which the molar ratio of carboxylate anions to cobalt (II) cations is from 0.10 to 6.8 and the aqueous solution contains no more than 1 % of each of ammonia, ammonium ions, and nitrite ions.
On fabrique une composition aqueuse liquide sans chromate destinée à former un revêtement protecteur sur les métaux, notamment l'aluminium, en faisant réagir des cations cobalt (II), des anions carboxylate, au minimum un autre type d'agent complexant de coordination pour des cations cobalt (III) et un agent oxydant dans une solution aqueuse dans laquelle le rapport molaire entre les anions carboxylate et les cations cobalt (II) est de 0,10 pour 6,8; la solution aqueuse ne contenant pas plus de 1 % d'ammoniac, d'ions ammonium et d'ions nitrite.
Carlson Lawrence R.
Dolan Shawn E.
Pierce John R.
Fetherstonhaugh & Co.
Henkel Kommanditgesellschaft Auf Aktien
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