Strip based on coated aluminum, which is resistant to corrosion

Stock material or miscellaneous articles – Composite – Of silicon containing

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427567, 427527, 427588, 4272481, 20419223, C23C 1400, C23C 1640

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active

058305793

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL DOMAIN

The invention relates to strips generally for reflecting or decorative use, which are based on aluminum or its alloys, which are coated with a deposit for protection against corrosion, and which are capable of being worked by shaping without alteration of the protection.


STATE OF THE ART

It is known that reflecting Al strips used, for example, as reflectors in the field of lighting, as a mirror, or as a decorative article requiring a high degree of brightness, need to keep their bright appearance during the course of use. This brightness can be dulled because of corrosion by the surrounding atmosphere, by the deposition of fine dust, scratches, fingerprints, etc. . . .
One way of protecting this brightness consists of coating the bright surface with a transparent coating that is resistant to corrosion, to scratching . . . ; this coating should alter the initial brightness as little as possible.
Thus, in order to obtain smooth reflecting strips, a conventional process consists of performing, on a very bright rolled Al alloy strip, an electrochemical pickling operation, then an electrochemical brightening treatment before electrochemical anodic oxidation, with the intention of obtaining a protective alumina film. A strip protected in this way can then be shaped, for example, by deformation, bending, embossing, cutting . . . , in order to manufacture the desired articles, such as reflectors for lighting or heating apparatuses, mirrors, bright pieces with a decorative effect (packaging of luxury cosmetic products, finishing articles for automobiles . . . ).
This process of electrochemical brightening and anode oxidation, or anode oxidation alone, is also applied to Al strips that have a different surface appearance (dull, for example) in order to improve its rendering and its protection.
However, in order to obtain smooth bright strips, such a solution has several disadvantages: at least of the 1085 type (in the classification of the Aluminum Association), which alone can be brightened electrochemically; with its protective alumina deposit to be shaped by deformation without the alteration of said deposit, is insufficient; in effect, when one wishes to do a folding or embossing operation with or without elongation or thinning, cracking of the alumina coating occurs, which alters the brightness and the resistance to corrosion of the coated strip. the electrochemical brightening operation. effluents, which are damaging to the environment and must be treated before being discarded.
Thus, the applicant has sought to develop a strip based on aluminum, which has a particular surface appearance previously obtained by rolling, for economical, lending itself easily to shaping, for example, by bending, embossing, and with the resulting elongation, without altering its protection and its initial surface appearance.
She also sought to improve the brightness or the reflecting quality of the coated sheets, as well as their resistance in a corrosive atmosphere.
She also sought to obtain a coated strip that was not very sensitive to the deposition of dust or other dirt, such as fingerprints, which can occur during handling operations, and also which is not very sensitive to scratching.
She also sought to obtain articles with a particular surface appearance, reflecting or not (in particular, reflectors or decorative articles) directly by the mechanical working of a coated strip, for example, by embossing, bending . . . , keeping the appearance of the initial noncoated strip and the quality of the provided protection over time.


DESCRIPTION OF THE INVENTION

The invention is a strip based on aluminum or its alloys, coated with an anticorrosion protective substance, with said strip having an improved shaping capability allowing one to keep its surface appearance and anticorrosion protection intact after shaping, which is characterized by the fact that the coating consists of a layer of silicon oxide.
The invention is particularly applied to strips based on aluminum or its alloys, which has an initial surfac

REFERENCES:
patent: 4568614 (1986-02-01), Eichen
patent: 5047131 (1991-09-01), Wolfe
patent: 5508368 (1996-04-01), Knapp
patent: 5523124 (1996-06-01), Slootman

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