MICROCRYSTALLINE ANODIC COATINGS AND RELATED METHODS THEREFOR
First Claim
1. A method of producing an anodized aluminum substrate having structures of at least one of partially microcrystalline aluminum oxide and partially microcrystalline aluminum hydroxide from an aluminum substrate having cells with micropores and walls of at least one of amorphous aluminum oxide and amorphous aluminum hydroxide, comprising:
- introducing a metal cationic species into at least a portion of the micropores;
converting at least a portion of the metal cationic species into a metal hydroxide;
converting at least a portion of the metal hydroxide into a metal oxide; and
converting at least a portion of the walls of at least one of amorphous aluminum oxide and amorphous aluminum hydroxide into structures of at least one of partially microcrystalline aluminum oxide and partially microcrystalline aluminum hydroxide.
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Accused Products
Abstract
Methods of preparing metal and metal alloys with partially microcrystalline anodic coatings are disclosed. Associated article therefrom are correspondingly disclosed. The partially microcrystalline anodic coatings exhibit steam, superheated steam, alkaline and acidic resistance. Partially microcrystalline anodic coating can be prepared by impregnation of micropores of a metal or metal substrate with metal precursor species, conversion of the metal precursor species into metal hydroxides, thermal treatment to dry out moisture and to promote phase transformation of the metal hydroxide product into metal oxides solids and bonding with metastable metal oxide substance in the pore structure of the metal or metal alloy substrate, and hydrothermal sealing to create sealed partially microcrystalline anodic coating.
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Citations
21 Claims
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1. A method of producing an anodized aluminum substrate having structures of at least one of partially microcrystalline aluminum oxide and partially microcrystalline aluminum hydroxide from an aluminum substrate having cells with micropores and walls of at least one of amorphous aluminum oxide and amorphous aluminum hydroxide, comprising:
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introducing a metal cationic species into at least a portion of the micropores; converting at least a portion of the metal cationic species into a metal hydroxide; converting at least a portion of the metal hydroxide into a metal oxide; and converting at least a portion of the walls of at least one of amorphous aluminum oxide and amorphous aluminum hydroxide into structures of at least one of partially microcrystalline aluminum oxide and partially microcrystalline aluminum hydroxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing an anodized aluminum substrate, comprising steps of:
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immersing the aluminum substrate in a first aqueous metal salt solution; exposing the aluminum substrate to one of an alkaline solution having a pH in a range of from about 8 units to about 13 units and ultrasonic energy, after immersing the aluminum substrate in the first aqueous solution; thermally treating the aluminum substrate in an oxidizing atmosphere at a drying temperature of at least about 150°
C. after immersing the aluminum substrate in the alkaline solution; andimmersing the aluminum substrate in a second aqueous metal solution having a temperature in a range of from about 75°
C. to about 95°
C. after thermally treating the aluminum substrate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An aluminum article comprising an anodized coating of at least about 0.05 mm having a Taber abrasion loss of less than about 109 mg as determined in accordance with ASTM 4060 after immersion in a sodium hydroxide solution at least about 0.04 wt % for 11 days at a temperature in a range of from about 15°
- C. to about 25°
C.
- C. to about 25°
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18. An aluminum article comprising a dyed anodized coating of at least about 0.05 mm having a fading that of less than a Δ
- L* of about 1.5, a Δ
a* of about 2.0, and Δ
b* of about 2.5 values in accordance with a CIE (Commission Internationale d'"'"'Eclairage) 1976 L*, a*, b* color scale as performed in accordance with ASTM E 308, after exposure, for at least 5 cycles, to ultrasonic cleaning with a solution having a pH of 12 and to autoclaving at 275°
F. - View Dependent Claims (19)
- L* of about 1.5, a Δ
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20. An aluminum article comprising an anodized coating of at least about 0.05 mm having the X-ray diffraction (XRD) spectrograph of
FIG. 7 .
Specification