Non-chromated oxide coating for aluminum substrates

Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...

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106 125, 106 127, 148243, 148273, 148275, 148285, 148286, C23C 2200

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054116066

ABSTRACT:
(A) A process for forming an oxide film cobalt conversion coating on a metal substrate, thereby imparting corrosion resistance and paint adhesion properties. The invention was developed as a replacement for the prior art chromic acid process. The process includes the steps of: (a) providing a cobalt conversion solution comprising an aqueous reaction solution containing a soluble cobalt-III hexacoordinated complex, the concentration of the cobalt-III hexacoordinated complex being from about 0.01 mole per liter of solution to the solubility limit of the cobalt-III hexacoordinated complex; and (b) contacting the substrate with the aqueous reaction solution for a sufficient amount of time, whereby the cobalt conversion coating is formed. The substrate may be aluminum or aluminum alloy, as well as Cd plated, Zn plated, Zn--Ni plated, and steel. The cobalt-III hexacoordinated complex may be present in the form of Me.sub.m [Co(R).sub.6 ].sub.n, wherein Me is Na, Li, K, Ca, Zn, Mg, or Mn, and wherein m is 2 or 3, n is 1 or 2, and R is a carboxylate having from 1 to 5 C atoms.
(B) A chemical conversion coating solution for producing the cobalt conversion coating on a metal substrate, the solution including an aqueous reaction solution containing a soluble cobalt-III hexacoordinated complex, the concentration of the cobalt-III hexacoordinated complex being from about 0.01 mole per liter of solution to the solubility limit of the cobalt-III hexacoordinated complex.
(C) A coated article exhibiting acceptable corrosion resistance and paint adhesion properties, the article including: (a) a metal substrate; and (b) an oxide film cobalt conversion coating formed on the substrate, the cobalt conversion coating including aluminum oxide Al.sub.2 O.sub.3 as the largest volume percent, and cobalt oxides CoO, Co.sub.2 O.sub.3, and Co.sub.3 O.sub.4.

REFERENCES:
patent: 1551613 (1925-09-01), Pacz
patent: 1607676 (1926-11-01), Jirotka
patent: 2796370 (1957-06-01), Ostrander et al.
patent: 2796371 (1957-06-01), Ostrander et al.
patent: 2906009 (1959-09-01), Knoll et al.
patent: 3138479 (1964-06-01), Foley
patent: 3403035 (1968-09-01), Schneble et al.
patent: 3423214 (1969-01-01), Koretzky
patent: 3438798 (1969-04-01), Baudrand et al.
patent: 3444007 (1969-05-01), Maurer et al.
patent: 3592747 (1971-07-01), Cohn
patent: 3615740 (1971-10-01), Goltz
patent: 3790453 (1974-02-01), Wanamaker et al.
patent: 3819424 (1974-06-01), Russell et al.
patent: 3870607 (1975-03-01), Bardach
patent: 3877981 (1975-04-01), Arnold
patent: 3905838 (1975-09-01), Ito
patent: 3928237 (1975-12-01), Davis
patent: 3954510 (1976-05-01), Gunn et al.
patent: 3993510 (1976-11-01), Bellavin
patent: 4088486 (1978-05-01), Bissonette
patent: 4150172 (1979-04-01), Kolk, Jr.
patent: 4208212 (1980-02-01), Kuzuwata et al.
patent: 4218240 (1980-08-01), Gingerich et al.
patent: 4233063 (1980-11-01), Ritsko et al.
patent: 4261766 (1981-04-01), Crouch
patent: 4278463 (1981-07-01), Vanderpool et al.
patent: 4278477 (1981-07-01), Reinhold
patent: 4337097 (1982-06-01), Tokumasu et al.
patent: 4348224 (1982-09-01), Gingerich et al.
patent: 4381203 (1983-04-01), Reinhold
patent: 4392920 (1983-07-01), McDonald
patent: 4631093 (1986-12-01), Etemovich
patent: 4637374 (1987-01-01), Arai
patent: 4647347 (1987-03-01), Schoener
patent: 4659605 (1987-04-01), Malik et al.
patent: 4696724 (1987-09-01), Deguchi et al.
patent: 4804407 (1989-02-01), Scheithauer et al.
patent: 4897129 (1990-01-01), Tuttle, Jr. et al.
M. Munakata, "Some New Oxygenated Cobalt Complexes," Bulletin Of The Chemical Society of Japan, vol. 44, pp. 1791-1796 (1971).
S. Fukuzumi et al., "Activation Of Cobalt(III)-Alkyl Bonds Through Interaction With Organic Oxidants . . . ," Chemistry Letters, pp. 421-424 (1984).
I. Sasaki et al., "X-Ray And Electrochemical Investigation Of A Series of Cobalt Complexes . . . ", Polyhedron, vol. 6, pp. 2103-2110 (1987).
European Search Report on Appln. No. EP 91 20 2181 (corr. to U.S. Appln. No. 07/621,132) dated 12 Oct. 1992.
Pascal, "Nouveau Traite de Chimie Minerale" 1959, Masson & Cie, Paris, Fr. vol. XVIII, pp. 680-681: Cobaltnitrites.
Chemical Abstracts, vol. 89, 1978, abstract No. 122118c, Complexes of Cobalt containing ammonia or ethylenediamine.
European Search Report on Appln. No. EP 91 20 2515 (corr. to U.S. Appln. No. 07/732,568) dated 9 Oct. 1992.
G. Jander and E. Blasius, "Einfuhrung in das anorganisch-chemische Praktikum" (1968), pp. 106-107. (No translation).
Van Nostrand's Scientific Encyclopedia (1983), Sixth Edition, vol. I: p. 124, "Ammines".
"Deposition of Nickel and Cobalt by Chemical Reduction", Brenner and Riddell, Journal of Research of the National Bureau of Standards, vol. 39: pp. 385-395 (Nov. 1947).
"Nickel and Cobalt Films" by Samuel Wein, The Glass Industry, pp. 22, 23, 35, 46 (Jan. 1960).
"Regulating Coercivity of Magnetic Thin Films", Tsu & Sakamoto, IBM Technical Disclosure Bulletin, pp. 52-53, vol. 4, No. 8 (Jan. 1962).
European Search Report on Application No. EP 91 10 3498 dated 28 Jun. 1991, The Hague.
W. Fernelius ed., "69. Hexamminecobalt(III) Salts," Inorganic Syntheses, first edition, vol. II, pp. 216-221 (McGraw-Hill 1946).
A. Martell and M. Calvin, Chemistry Of The Metal Chelate Compounds, pp. 1-18 (Prentice-Hall 1952).

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