Coating processes – Direct application of electrical – magnetic – wave – or... – Sonic or ultrasonic
Patent
1993-03-31
1994-05-03
Beck, Shrive
Coating processes
Direct application of electrical, magnetic, wave, or...
Sonic or ultrasonic
427230, 4273747, 4273762, 4273778, 501 60, 501 74, C03C 315, B05D 302
Patent
active
053086520
ABSTRACT:
Articles formed of lead glass or crystal are treated in order to minimize the tendency for the article to leach lead or other heavy metals into products, such as alcohols or acidic foods, placed in contact therewith. In a preferred embodiment, flasks formed of glass containing between about 12% and 40% by weight lead oxide are provided with a thin layer or slip of kaolin, and heated at a temperature and for a time sufficient to exchange lead ions in the flask with ions other than lead in the kaolin layer. Preferably, the layer is applied as a thixotropic barbotin (slip) of pure hydrated aluminum silicate, and coated flasks are exposed to a temperature of between about 300.degree. C. and the strain point of the glass forming the flask and for a time ranging between about 3 and about 6 hours; rapid heating and cooling is avoided. Following the heating step, the resulting silico-aluminous crust on the surface is removed to leave a silico-aluminous diffusion barrier in the treated surface of the flask which opposes migration or drift of lead ions in the flask into a product, such as an alcohol or food, placed into contact with the treated ("cemented") surface.
REFERENCES:
Metsen et al., "Suppression of Molecular Ions in the Secondary Ion Mass Spectra of Minerals," Surf. Interf. Anal., 181-185 (1988).
Muir et al, "Characteristics of Altered Labradorite Surfaces by SIMS and XPS,"Geochim. Cosmochim. Acta, 53, 1235-1241 (1989).
Beck Shrive
Compagnie des Cristalleries de Baccarat
Utech Benjamin L.
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