C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 17/02 (2006.01) C03C 15/02 (2006.01) C03C 17/00 (2006.01) C03C 17/10 (2006.01) C03C 17/22 (2006.01) C03C 17/30 (2006.01) C03C 21/00 (2006.01) C03C 23/00 (2006.01)
Patent
CA 2041964
Process for treating the surface of a solid article made of a material having a vitreous structure, such as crystal, lead glass and the same, and containing some amounts of heavy metals such as lead, said surface being liable to be into contact with products of acid character, such as alcohols e.g cognac, whisky, wines or fruit juices, or acid foodstuffs, with a view to prevent said heavy metals from drifting into said acid products, characterized in that it comprises forming in a superficial area of said surface, after partially removing the lead ions from said area, a silico-aluminous diffusion barrier opposing said drift into said acid product, by ion exchange between said material having a vitreous structure and a coating temporarily laid upon said surface, said coating comprising a silico-aluminous crust resulting from the heating of a kaolin layer laid upon said surface under the form of a thixotropic barbotine of pure hydrated aluminium silicate.
Méthode pour traiter la surface d'un article solide, constitué d'un matériau à structure vitreuse, comme le cristal, le verre au plomb ou un matériau semblable, renfermant certaines quantités de métaux lourds, notamment le plomb; ladite surface peut se trouver au contact avec des produits de nature acide, comme les alcools - p. ex. cognac, whisky et vins -, les jus de fruits ou des aliments acides, et, pour empêcher les métaux lourds de passer dans lesdits produits acides, il y a formation dans une section superficielle de ladite surface, après élimination partielle des ions plomb provenant de cette section, d'une barrière de diffusion en silico-aluminium bloquant le passage vers lesdits produits acides, par échange ionique entre ledit matériau à structure vitreuse et un revêtement appliqué temporairement sur ladite surface; ledit revêtement comprend une croûte de silico-aluminium résultant du chauffage d'une couche de kaolin appliquée sur ladite surface sous forme de barbotine thixotrope de silicate d'aluminium hydraté pur.
Compagnie Des Cristalleries de Baccarat
Mcfadden Fincham
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