Chemistry: electrical and wave energy – Processes and products
Patent
1989-07-19
1991-11-12
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 42, C25D 1122
Patent
active
050645129
ABSTRACT:
Substituted diphenols, phenyl ethers containing two oxygen atoms attached to a benzene nucleus, and naphthols are more practically effective than previously known additives in stabilizing tin (II) salts, in electrolyte solutions useful for coloring anodized aluminum by electrolysis therein, against oxidation to tin(IV) by reaction with ambient oxygen. Preferred additives include 2-tert-butyl-1,4-dihydroxybenzene, methylhydroquinone, trimethylhydroquinone, 4-hydroxynaphthalene-2,7-disulfonic acid, and p-hydroxyanisole. If p-toluenesulfonic acid or napthalene sulfonic acid are also used in the electrolyte, the throwing power can be greatly improved.
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patent: 3849263 (1970-06-01), Gedde
patent: 4042468 (1976-03-01), Hasegawa et al.
patent: 4401525 (1979-11-01), Ruf
S. Wernick et al., Die Oberflaechenbehandlung von Aluminium, 2nd Ed., 1977, p. 364.
S. A. Pozzoli et al., Korrosionsschutz Alum., Verants. Eur. Foed Korros, Vortr. 88th, 1976, pp. 139-145.
Metal Finishing Abstracts, vol. 23 (1981), Jan./Feb., No. 1, Teddington, Middlesex, England.
Brodalla Dieter
Buchmeier Willi
de Riese-Meyer Loert
Foell Juergen
Lindener Juergen
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Leader William T.
Niebling John F.
Szoke Ernest G.
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