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Publication numberUS1710743 A
Publication typeGrant
Publication dateApr 30, 1929
Filing dateApr 16, 1926
Priority dateApr 16, 1926
Publication numberUS 1710743 A, US 1710743A, US-A-1710743, US1710743 A, US1710743A
InventorsAladar Pacz
Original AssigneeAladar Pacz
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Surface treating aluminum articles
US 1710743 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Patented Apr. 30, 1929.



No Drawing.

This invention relates to the coating of aluminum articles for the purpose of enhancing their artistic appearance, preventing corrosion, or constituting a base for paint, varnish, enamel, lacquer, Japan or other coating. By aluminum I mean not only the pure metal but alloys in which aluminum is preponderant. It has long been a matter of known difiieulty to coat or color articles of aluminum and the object of my present invention is the provision of a particularly cheap, simple, rapid, and reliable process and composition of matter for this purpose.

In my Patent No. 1,551,613 I described methods of coating aluminum articles by immersion in solutions containing ammonia with or without metallic salts designed to change the depth, hardness, or color of the coating so produced. This involved for its successful performance the use of very strong solutions of ammonia heated to a rather high temperature and hence extremely oifensive to workmen and expensive to maintain. In the Roux Patent No. 1,095,-

357, (which I control) there is set forth a process of coating aluminum by the use of an electric potential and an ammoniacal solution but electro-plating is usually run as an independent business and is seldom entrusted to casual factory employees, whereas I have sought a process of such simplicity as to be performed Without skilled attendants. I have discovered that articles of aluminum and itsalloys can be successfully coated and colored without ammonia and fluoride salts.

Without the use of electric current by the use of dipping solutions of certain double The color and nature of the coating can be modified by the addition of salts of various other metals.

Immersion of a pure aluminum article in a solution of a soluble silico fluoride (such Application filed April 16, 1926. Serial No. 102,560.

the nature and amount of such other metal.

In the case of copper aluminum alloys the color thus produced is yellowish, golden or reddish and-in the case of silic'on'alloys grey to black, dependent upon the proportion of the respective constituents and to some extent on the strength of the solution and time of the immersion. The latter conditions, namely time and concentration, are operative only up to a maximum degree dependent upon the alloy composition after which further treatment has no additional effect.

The strengthof the solution which I prefer to employ is one containing from about to about 2% more or less of sodium silico fluoride or other soluble double fluoride having such a dissolving action e. g. sodium zirconium fluoride, sodium titanium fluoride, potassium zirconium fluoride, potassium silico fluoride, potassium titanium fluoride, etc. All the alkali bases can be used and many second metals; the reason I advocate sodium silico fluoride ,is'that it is essentially a waste product and hence cheap and abundant.

The nature of the act-ion may be modified by the production on the etched surface of the aluminum of an added coating containing some other metal in adherent form, and this can be accomplished at the same time and in the same solution and without electrical potential. I have had successful results with additions of silver, nickel, cobalt, zinc, cadmium, antimony, tin, lead, iron, and manganese. These apparently can be added in substantially any soluble form. ()ne of the simplest isthe oxide, and this form although less easily soluble in some cases, is advantageous in maintaining the purity of the bath. Another convenient compound is etc. give entirely successful results. In general the color of the coating produced is a grey of lighter or darker shade and this the carbonate, but the sulphates, chlorides,

coating is of such hardness and adherence as even to stand moderate scratoh brushing. Darker colors can be obtained by using combinations of metals; for example, the use of zinc and antimony in combination gives black colored coating on pure aluminum; likewise zinc and iron. The addition of a small amount of copper to the other metals employed also darkens the coating substantially. The use of soluble manganese salts such as potassium permanganate also has adarkening effect.

I prefer to use a relatively small amount of the metal compound as compared with the double fluoride salt. I have had excellent results with an amount of the metal compound equivalent to onetenth of the amount of fluoride salt present, although I do not restrict myself to these proportions since the same can be modified very substantially in both directions, only it seems to be necessary at least for the best results, that the amount of the metal compound be substantially less than that of the double fluoride.

The solution, whatever its composition within the limits I have described, is preferably used hot and the articles are im merscd therein for periods as low as onehalf minute but usually about one to five minutes. No danger from over treatment need be apprehended, (excepting in the case of pickling the pure aluminum in pure double fluoride) since the effect of an alloyed metal in the article or an added metal in establishments.

Having thus described my invention what I claim is:

1. A dipping solution for producing a colored coating on articles composed at least in part of aluminum which contains a soluble fluorine compound and a salt of one of the metals, silver, nickel, tin, cobalt, zinc, cadmium, iron, manganese, lead, antimony, copper.

2. A dipping solution for producing a black adherent, protective coating on articles made at least in part of aluminum which contains a soluble double fluoride, a soluble zinc salt, and a soluble salt of another nonalkali metal.

3. A dipping solution for aluminum articlescontaining an alkaline silico fluoride and a soluble salt of one of the metals, nickel, cobalt, iron, silver, zinc, cadmium, copper, lead, antimony, manganese, tin.

In testimony whereof I hereunto afiix my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2418265 *Aug 20, 1940Apr 1, 1947Sherka Chemical Co IncProcess for providing aluminum and aluminum alloys with metal coatings
US2465443 *Aug 3, 1945Mar 29, 1949Gide ReneTreatment of magnesium and magnesium alloy articles to increase their resistance to corrosion
US2512493 *Jul 11, 1946Jun 20, 1950Rene GideTreatment of magnesium and magnesium base alloys to increase their resistance to corrosion
US3964936 *Dec 17, 1974Jun 22, 1976Amchem Products, Inc.Coating solution for metal surfaces
US4273592 *Dec 26, 1979Jun 16, 1981Amchem Products, Inc.On aluminum, zirconium and/or hafnium source, fluoride, and polyhydroxy compound
US4294627 *May 28, 1980Oct 13, 1981Metal Box LimitedTreatment of tinplate surfaces
US4338140 *Jul 14, 1980Jul 6, 1982Hooker Chemicals & Plastics Corp.Coating composition and method
US4711667 *Sep 18, 1986Dec 8, 1987Sanchem, Inc.Alkaline metal permanganate and alkaline metal tetraborate buffer
US4895608 *Apr 29, 1988Jan 23, 1990Sanchem, Inc.Protective coating, aluminum nitrate, phosphoric acid
US5296052 *Aug 1, 1990Mar 22, 1994Nippon Paint Co., Ltd.Surface treatment chemicals and bath for aluminum or its alloy and surface treatment method
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US6887308Jan 21, 2003May 3, 2005Johnsondiversey, Inc.Mixtures of curing agents, couplers and solvents used as primers for steel panels, used to improve adhesion of protective coatings; corrosion resistance
US8815021Sep 17, 2010Aug 26, 2014Henkel Ag & Co. KgaaOptimized passivation on Ti/Zr-basis for metal surfaces
DE977586C *Dec 11, 1952Jun 8, 1967Amchem ProdVerfahren zur Erzeugung von UEberzuegen auf Aluminium und dessen Legierungen
DE102008014465A1 *Mar 17, 2008Sep 24, 2009Henkel Ag & Co. KgaaOptimierte Passivierung auf Ti-/Zr-BAsis für Metalloberflächen
DE102008014465B4 *Mar 17, 2008May 12, 2010Henkel Ag & Co. KgaaMittel zur optimierten Passivierung auf Ti-/Zr-Basis für Metalloberflächen und Verfahren zur Konversionsbehandlung
EP0158287A2 *Apr 4, 1985Oct 16, 1985Nihon Parkerizing Co., Ltd.Process for treating aluminium surfaces
WO1985005131A1 *May 3, 1985Nov 21, 1985Amchem ProdMetal treatment
U.S. Classification148/273
International ClassificationC23C22/05, C23C22/68
Cooperative ClassificationC23C22/68
European ClassificationC23C22/68