C - Chemistry – Metallurgy – 23 – G
Patent
C - Chemistry, Metallurgy
23
G
C23G 1/12 (2006.01) C25F 3/20 (2006.01)
Patent
CA 2181703
A method of forming highly reflective surface on aluminum alloys com- prising (a) brightening the surface of a body formed from an aluminum alloy; and(b) desmutting the freshly brightened body in a bath. The desmutting bath com- prises 10-100 volume percent nitric acid; 0-60 volume percent sulfuric acid, 0-50 volume percent water; and at least 15 grams per liter of a source of bifluoride.Ammonium fluoride is the preferred source of fluoride.
Cette invention se rapporte à un procédé qui permet de former une surface hautement réfléchissante sur des alliages d'aluminium et qui consiste: (a) à polir la surface d'un corps formé à partir d'un alliage d'aluminium; et (b) à éliminer les dépôts mats se trouvant sur ce corps fraîchement poli en le plongeant dans un bain. Ce bain d'élimination des dépôts mats comprend 10 à 100 % en volume d'acide nitrique, 0 à 60 % en volume d'acide sulfurique, 0 à 50 % en volume d'eau, et au moins 15 grammes par litre d'une source de bifluorure. Le fluorure d'aluminium constitue la source préférée de fluorure.
Askin Albert L.
Schultz Paul B.
Aluminum Company Of America
Smart & Biggar
LandOfFree
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