US1965682A - Coating aluminum - Google Patents

Coating aluminum Download PDF

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Publication number
US1965682A
US1965682A US589056A US58905632A US1965682A US 1965682 A US1965682 A US 1965682A US 589056 A US589056 A US 589056A US 58905632 A US58905632 A US 58905632A US 1965682 A US1965682 A US 1965682A
Authority
US
United States
Prior art keywords
aluminum
sulfuric acid
electrolyte
acid
per cent
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 - Lifetime
Application number
US589056A
Other languages
English (en)
Inventor
Harold K Work
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.)
ALUMINUM COLORS Inc
Original Assignee
ALUMINUM COLORS Inc
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
Priority to DENDAT616812D priority Critical patent/DE616812C/de
Priority to DENDAT629629D priority patent/DE629629C/de
Application filed by ALUMINUM COLORS Inc filed Critical ALUMINUM COLORS Inc
Priority to US589056A priority patent/US1965682A/en
Priority to US589057A priority patent/US1965683A/en
Priority to GB24333/32A priority patent/GB409679A/en
Priority to FR761876D priority patent/FR761876A/fr
Application granted granted Critical
Publication of US1965682A publication Critical patent/US1965682A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids

Definitions

  • the so-called processes of oxide-coating aluminum which consist essentially in providing aluminum with a hard adherent coating composed in substantial part of aluminum oxide, have become a matter of considerable commercial import.
  • the process comprises making the aluminum an anode in an electrolytic cell the electrolyte of which is a solution containing up to about per cent of sulfuric acid by weight. About 5 to 40 volts are impressed upon the cell at temperatures usually below about 40 centigrade. Under the combined action of the acid and the current, an oxide coating, the specific characteristics of which depend in substantial part on the concentration of the electrolyte, is formed on the aluminum. While such processes have been considered to be generally satisfactory, they have certain inherent disadvantages which are not easily overcome.
  • the general object of this invention is the improvement of the above methods by the provision of a modified sulfuric acid solution electrolyte which is capable of producing coatings of improved properties and which is, moreover, excellently adapted to commercial operation. Further and similar objects will appear in the following description of my invention.
  • a standard test for the abrasion resistance of such coatings is carried out by rotating a plate of the oxide-coated aluminum against an abrasive wheel under a constant pressure. The number of revolutions of the plate required to penetrate the coating is taken as a measure of the abrasion resistance.
  • the abrasion resistance of the oxidecoated aluminum which was prepared in the sulfuric acid electrolyte was 340 while the abrasion resistance of the oxide-coated aluminum prepared in the sulfuric acid-dibasic organic acid electrolyte was 490.
  • the abrasion resistance of the oxide-coated aluminum produced in the sulfuric acid electrolye was only 50 while the abrasion resistance of the oxidecoated aluminum produced in the sulfuric acid-. dibasic organic acid electrolyte was 580.
  • the oxide-coatings produced by the use of sulfuric acid-dibasic organic acid electrolytes in accordance with my invention retain the desirable characteristics of the oxide coatings produced in sulfuric acid electrolyte. white; they are hard; they are composed in substantial part of aluminum oxide;
  • C3H4O4 malonic acid
  • sulfuric acid when mixed with sulfuric acid to form the electrolyte, produce coatings in which appear to be realized the greatest benefits of my invention.
  • dibasic acids which are useful are maleic acid (114C404), succinic acid (C4H6O4), and so forth.
  • the dibasic organic acid may be mixed with sulfuric acid in varying proportions and excellent oxide coatings produced, by the use thereof, on aluminum.
  • the sulfuric acid-dibasic organic acid electrolyte is placed in an electrolytic cell the cathode of which may be any suitable material such as aluminum or lead and the anode of which is the aluminum or aluminum alloy article which is to be coated.
  • a voltage which is usually about 10 to 30 volts but which may be as high as 50 volts, is impressed upon the cell and the operation is continued until a coating of the desired thickness is formed.
  • hard of surface may be built up on aluminum.
  • oxide-coated aluminum which comprises making the article to be coated an anode in an electrolytic cell, the electrolyte of which contains in solution 0.5 to '70 per cent sulfuric acid and a dibasic organic acid of the group consisting of oxalic, malic, ma-
  • a process of producing oxide-coated alumi- 1 num articles which comprises making the article to be coated an anode in an electrolytic cell, the electrolyte of which contains in solution about 0.5 per cent sulfuric acid and about 3 per cent oxalic acid.
  • a process of producing oxide-coated aluminum which comprises making the article to be coated an anode in an electrolytic cell, the electrolyte of which contains in solution about 3 per cent of sulfuric acid and about 3 per cent of malonic acid.
  • the process of producing oxide-coated aluminum which comprises making the article to be coated an anode in an electrolytic cell, the electrolyte of which contains in solution about 3 per cent sulfuric acid and about 3 per cent malic acid.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Printing Plates And Materials Therefor (AREA)
US589056A 1932-01-26 1932-01-26 Coating aluminum Expired - Lifetime US1965682A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DENDAT616812D DE616812C (en, 2012) 1932-01-26
DENDAT629629D DE629629C (en, 2012) 1932-01-26
US589056A US1965682A (en) 1932-01-26 1932-01-26 Coating aluminum
US589057A US1965683A (en) 1932-01-26 1932-01-26 Coating aluminum
GB24333/32A GB409679A (en) 1932-01-26 1932-08-31 Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles
FR761876D FR761876A (fr) 1932-01-26 1933-01-26 Perfectionnements au traitement de la surface d'objets en aluminium ou en alliages d'aluminium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US589056A US1965682A (en) 1932-01-26 1932-01-26 Coating aluminum

Publications (1)

Publication Number Publication Date
US1965682A true US1965682A (en) 1934-07-10

Family

ID=24356423

Family Applications (1)

Application Number Title Priority Date Filing Date
US589056A Expired - Lifetime US1965682A (en) 1932-01-26 1932-01-26 Coating aluminum

Country Status (4)

Country Link
US (1) US1965682A (en, 2012)
DE (2) DE616812C (en, 2012)
FR (1) FR761876A (en, 2012)
GB (1) GB409679A (en, 2012)

Cited By (11)

* 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
US2771650A (en) * 1952-02-04 1956-11-27 Gen Motors Corp Shell molding
US3252875A (en) * 1961-11-09 1966-05-24 Aluminum Co Of America Aluminum anodizing method
US3265597A (en) * 1962-06-16 1966-08-09 Vaw Ver Aluminium Werke Ag Anodizing process and electrolyte
US3275537A (en) * 1962-05-25 1966-09-27 J J Carnaud & Forges Ets Process of anodizing aluminum
US3276980A (en) * 1963-01-29 1966-10-04 Gen Motors Corp Method of anodizing aluminum
US3405042A (en) * 1965-03-04 1968-10-08 Vaw Ver Aluminium Werke Ag Aluminum anodizing process
US3472744A (en) * 1965-12-09 1969-10-14 Acorn Anodising Co Ltd Anodising of aluminium and its alloys
US3494840A (en) * 1964-06-30 1970-02-10 Reynolds Metals Co Method of increasing the compressive strength of aluminum honeycomb core
US3743547A (en) * 1969-10-27 1973-07-03 R Green Protection of metallic surfaces
US5963435A (en) * 1997-03-25 1999-10-05 Gianna Sweeney Apparatus for coating metal with oxide

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744046C (de) * 1938-11-23 1944-01-08 Paul Kiekeber Verfahren zur Erzeugung von harten, verschleissfesten UEberzuegen auf Aluminium und Aluminiumlegierungen
DE974298C (de) * 1942-05-23 1960-11-17 Siemens Ag Verfahren zur Herstellung eines elektrolytischen Kondensators
DE1276420B (de) * 1962-02-14 1968-09-29 Vaw Ver Aluminium Werke Ag Waessriges Bad und Verfahren zur anodischen Erzeugung von farbigen Oxidschichten aufGegenstaenden aus Aluminium oder Aluminiumlegierungen
DE1696305B1 (de) * 1965-07-21 1970-02-19 Vaw Ver Aluminium Werke Ag Verfahren zur Anodisierung von Gegenstaenden aus Aluminium oder Aluminiumlegierungen
US4252620A (en) * 1979-04-25 1981-02-24 Setsuo Tomita Process for forming an anodized film over the surface of aluminum substrates
DE3211782A1 (de) * 1982-03-30 1983-10-06 Siemens Ag Bad und verfahren zum anodisieren von aluminierten teilen

Cited By (11)

* 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
US2771650A (en) * 1952-02-04 1956-11-27 Gen Motors Corp Shell molding
US3252875A (en) * 1961-11-09 1966-05-24 Aluminum Co Of America Aluminum anodizing method
US3275537A (en) * 1962-05-25 1966-09-27 J J Carnaud & Forges Ets Process of anodizing aluminum
US3265597A (en) * 1962-06-16 1966-08-09 Vaw Ver Aluminium Werke Ag Anodizing process and electrolyte
US3276980A (en) * 1963-01-29 1966-10-04 Gen Motors Corp Method of anodizing aluminum
US3494840A (en) * 1964-06-30 1970-02-10 Reynolds Metals Co Method of increasing the compressive strength of aluminum honeycomb core
US3405042A (en) * 1965-03-04 1968-10-08 Vaw Ver Aluminium Werke Ag Aluminum anodizing process
US3472744A (en) * 1965-12-09 1969-10-14 Acorn Anodising Co Ltd Anodising of aluminium and its alloys
US3743547A (en) * 1969-10-27 1973-07-03 R Green Protection of metallic surfaces
US5963435A (en) * 1997-03-25 1999-10-05 Gianna Sweeney Apparatus for coating metal with oxide

Also Published As

Publication number Publication date
DE616812C (en, 2012)
FR761876A (fr) 1934-03-29
GB409679A (en) 1934-04-30
DE629629C (en, 2012)

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