GB1097390A - Improvements in and relating to selective area hardcoating of aluminum and alloys thereof - Google Patents

Improvements in and relating to selective area hardcoating of aluminum and alloys thereof

Info

Publication number
GB1097390A
GB1097390A GB43192/65A GB4319265A GB1097390A GB 1097390 A GB1097390 A GB 1097390A GB 43192/65 A GB43192/65 A GB 43192/65A GB 4319265 A GB4319265 A GB 4319265A GB 1097390 A GB1097390 A GB 1097390A
Authority
GB
United Kingdom
Prior art keywords
weight
articles
anodizing
chromic acid
asf
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB43192/65A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Technologies Corp
Original Assignee
United Aircraft Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Aircraft Corp filed Critical United Aircraft Corp
Publication of GB1097390A publication Critical patent/GB1097390A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/022—Anodisation on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/38—Chromatising

Abstract

Articles of aluminium and aluminium alloys containing less than 5% by weight of copper or the heavy metals or less than 8% by weight of silicon are masked by anodizing in a chromic acid bath at a constant current density in the range of 1 to 12 ASF to give an oxide film thickness of at least 40 micro-inches and mechanically stripping the oxide film from selected areas of the articles, and the masked articles are then hard anodized in the unmasked areas to provide an oxide coating thickness of at least 2 mils. Typically the chromic acid anodizing is effected with an aqueous solution containing 3% by weight chromic acid at a temperature of 60 to 94 DEG F., with an applied voltage in excess of 90 volts for 30 to 120 minutes, while hard anodizing is effected in an aqueous bath containing 10 to 25% by weight of sulphuric acid saturated with 15% by weight of CO2 at a temperature of 15 to 40 DEG F., preferably 15 to 25 DEG F., at a constant current density in the range 10 to 25 ASF for one hour. The treated articles may be sealed with hot water or nickel acetate solution.
GB43192/65A 1964-10-29 1965-10-12 Improvements in and relating to selective area hardcoating of aluminum and alloys thereof Expired GB1097390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US407568A US3367852A (en) 1964-10-29 1964-10-29 Selected area hardcoating of aluminum

Publications (1)

Publication Number Publication Date
GB1097390A true GB1097390A (en) 1968-01-03

Family

ID=23612621

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43192/65A Expired GB1097390A (en) 1964-10-29 1965-10-12 Improvements in and relating to selective area hardcoating of aluminum and alloys thereof

Country Status (4)

Country Link
US (1) US3367852A (en)
DE (1) DE1521072B2 (en)
GB (1) GB1097390A (en)
SE (1) SE327608B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5178333A (en) * 1974-12-28 1976-07-07 Ricoh Kk KANKOTAIDORAMUNOKOZO
US8398841B2 (en) * 2009-07-24 2013-03-19 Apple Inc. Dual anodization surface treatment
US9114487B2 (en) 2012-05-29 2015-08-25 Apple Inc. Components of an electronic device and methods for their assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692851A (en) * 1950-04-22 1954-10-26 Aluminum Co Of America Method of forming hard, abrasionresistant coatings on aluminum and aluminum alloys
US2691627A (en) * 1952-02-07 1954-10-12 Scovill Manufacturing Co Method of producing decorated aluminum articles
US2993847A (en) * 1958-04-04 1961-07-25 Burroughs Corp Aluminum treating process

Also Published As

Publication number Publication date
SE327608B (en) 1970-08-24
DE1521072B2 (en) 1970-08-13
DE1521072A1 (en) 1969-12-11
US3367852A (en) 1968-02-06

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