US3833484A - Method of forming an integral colored anodic oxide on aluminum pressure die castings - Google Patents

Method of forming an integral colored anodic oxide on aluminum pressure die castings Download PDF

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Publication number
US3833484A
US3833484A US00227593A US22759372A US3833484A US 3833484 A US3833484 A US 3833484A US 00227593 A US00227593 A US 00227593A US 22759372 A US22759372 A US 22759372A US 3833484 A US3833484 A US 3833484A
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percent
weight
aluminum
aluminum alloy
chromium
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Expired - Lifetime
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US00227593A
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English (en)
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K Yanagida
I Satake
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Priority claimed from JP46009521A external-priority patent/JPS5141573B1/ja
Priority claimed from JP46033823A external-priority patent/JPS5017337B1/ja
Priority claimed from JP46034264A external-priority patent/JPS5017338B1/ja
Application filed by Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
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    • 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
    • C25D11/14—Producing integrally coloured layers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • ABSTRACT An integral colored anodic Oxide film free from irreg- Feb. 24, 1971 Japan 46-9521 ular patterns of metal flow eams and cold shuts can May 18, 1971 P 46-33323 be formed on die castings by subjecting the surface of May 19, 1971 Japan 46-34264 pressure die castings of an aluminum alloy comprising 0.1 1.3 percent by weight of chromium, 0.2 3.4 U-S- percent of manganese aid chromium and manganese being present in the amounts are Fleld of Search 29, the area of quadrilateral hown in the FIGURE, up to 0.3 percent by weight of impurities References Clted and the balance of aluminum, to roughening and' FOREIGN PATENTS OR APPLICATIONS brightening treatments, and thereafter subjecting thus 671,508 10/1963 Canada 204/58 treated Products 10 anodizing treatment Mechanical 470,734 8
  • the FIGURE is a graph which shows the composition ranges of chromium and manganese in the alloy of the present invention.-
  • the present invention provides a method for forming an integral anduniform colored film on aluminum pressure die castings which comprises die casting by the known method an alloy comprising 0.1 1.3 percent by weight of chromium, 0.2 3.4 percent by weight of manganese, said chromium and manganese being present in the amounts which are within the area of quadrilateral ABCD shown in FIG. 1, up to 0.3 percent by weight of impurities and the balance of aluminum, roughening the surface of thus obtained die castings, subjecting the'products to brightening treatment and thereafter subjecting the products to the anodizing treatment in the usual known methods, preferably in 2 aqueous electrolyte containing 5 to 20 percent by weight of sulfuric acid.
  • the chromium content in the alloy is less than 0.1 percent by weight, effective coloration is not attained.
  • increase of the content of chromium yellowish color is increased, but the content of higher than 1.3 percent by weight is not preferred because it becomes necessary to raise the melting temperature of the alloy during the die casting procedure, whereby operation of pressure die casting becomes difficult due to increase of oxidation loss of the aluminum alloy and difficulty in parting from the pressure die casting dies.
  • the content of manganese should benot more than 2.2 percent by weight to obtain especially uniform anodic colored film.
  • the contents of chromium and manganese should be present in the amounts below the straight line connecting points A and B in FIG. 1 and when the contents exceed the values shown by the line AB, a film having uneven color is formed.
  • An anodic oxide film having various color tones of from golden color to brown and reddish brown colors is obtained by suitably controlling the contents of chromium and manganese within said range. That is, when the weight ratio of manganese to chromium is lower than about 1.3, the film turns yellowish brown, when it is about 1.3 3, the film turns golden color or brown color and when it is higher than about 3, the film turns reddish brown.
  • a more uniform and decorative colored anodic oxide film on aluminum pressure .die castings is obtained by controlling chromium and manganese in the amounts which are within the pentagonal area DEFGH shown in the FIGURE.
  • iron and silicon contained in the alloy of the present invention as impurities, it is necessary that iron be up to 0.2 percent by weight and silicon be up to 0.1 percent by weight because they cause the film to have greyish black color and prevent coloration of alloying elements added.
  • mechanical strength and castability of pressure die casting aluminum alloys can be improved by adding cobalt or zinc to the alloy. That is, addition of 0.005 0.8 percent by weight of cobalt can improve soldering of the melt of aluminum alloy to dies for pressure die casting and prevent hot tear of the die castings.
  • the soldering ofgeneral pressure die casting aluminum alloys is prevented by adding 0.6 1.0 percent by weight of iron.
  • addition of more than 0.2 percent by weight of iron causes the anodic oxide film to turn greyish black. Since removal of the die castings from dies becomes easy by addition of cobalt, it becomes possible to obtain products of more complicated shape.
  • cobalt has the additional effect of increasing the mechanical strength of the product without giving an adverse effect on the colored film.
  • cobalt has an effect of reducing the anodizing treatment time, thereby improving working efficiency.
  • content of cobalt is lower than 0.005 percent by strength of die castings without giving adverse effect on color tone of the oxide film.
  • Brinell hardness of Al-0.5 percent Mn-0.3 percent Cr alloy is H 27, but when the alloy contains 5 percent of zinc, Brinell hardness of the alloy becomes H 31.
  • content of zinc is less than 0.1 percent by weight,there is attained no such effect and when it exceeds 5.0 percent by weight, irregular patterns of metal flow, seams and cold shuts appear in the anodic oxide film.
  • the alloy of the present invention can be die cast by the usual pressure die casting method. Roughening of the surface of the die castings obtained may be conveniently effected by the generally known methods. Selection of abrasive materials for blasting treatment, treating time, etc. can be optionally determined depending upon the surface state of the product .desired. Chemical brightening treatment is an essential treatment and its treatment may be effected by the generally known methods.
  • the anodic oxide film of the die castings'subjected to no such treatment has a greyish black color and the desired film having light uniform golden, yellowish brown, brown and reddish brown color tone cannot be obtained.
  • the die castings obtained in accordance with the method of the present invention are excellent in weathering resistance and corrosion resistance and can successfully be used for building materials, ornaments, etc. Even such products as of complicated three dimensional design can be mass-produced at low cost by die casting methods. Therefore, it can be expected that the products will be highly utilized for building panels, houses, furnitures, utensils, vehicles, etc.
  • the area of quadrilateral ABCD shows the composition ranges of chromium and manganese in the alloy of the present invention and the area of pentagonal DEFGH shows theoptimum composition ranges of chromium and manganese in the alloy of the 1 present invention.
  • a die cast product was produced by die casting an aluminum alloy comprising 0.3 percent by weight of chromium, 0.5 percent by-weight of manganese, 0.12
  • EXAMPLE 2 A die cast product was produced by die casting an aluminum alloy comprising 0.2 percent by weight of render the surface thereof completely aventurine. Thus treated, the product was subjected to electro-polishing and then to anodizing treatment in a 15 percent aqueous solution of sulfuric acid at 20C under a current density of 2.0 A/dm for minutes to form a uniform 4O reddish brown anodic oxide film free from irregular patterns of metal flow,seams and cold shuts on the die cast product.
  • Liquid chemical yellowhoning polishing H 80 2.0 30 ish Y brown aluminum particle do. do. 1.0 do. 10 blasing steel shot do 10% blasting H 50 2.0 20 gold l3 do. do. do. 1.5 30 do. 15 aluminum particle do; 15% 2.0 reddish 27 blasting H SO brown sand blasting do. 1 do. 2.0 30 gold 20 aluminum yellowparticle electrodo. 3.0 10 i 9 blasting polishing brown steel shot chemical do. 2.0 15 brown 10 blasting polishing y do. do. do. 2.0 40 reddish 28 brown aluminum particle do. do. 2.0 20 gold 14 blasing chemical" treatment yellow: U for gaining I do. 2.0 15 ish l0 ave'nturine surface brown
  • the anodic oxide films obtained in the above Examples were all colored films free fromirregular patterns of metal flow, seams and cold shuts.
  • a method for forming a uniform, even, integral colored film on aluminum die castings comprising:
  • a method for forming a uniform, even, integral colored film on aluminum die castings comprising:
  • said aluminum casting comprising an aluminum alloy comprising 0.1-1.3 percent by weight chromium; 0.2-3.4 percent by weight manganese; saidchromium and manganese present in amounts within the area of quadrilateral ABCD shown in FIG. 1; up to 0.3 percent by weight impurities; 0005-08 percent by weight cobalt; and the balance of aluminum;
  • anodizing treatment in an aqueous electrolyte containing 5-20 percent by weight sulfuric acid, for forming an integral, uniform anodic oxide film having a color selected from the group consisting of gold, yellowish brown, brown and reddish brown.
  • said aluminum casting comprising an aluminum alloy comprising 0.1-1.3 percent by weight chromium; 0.2-3.4 percent by weight manganese; said chromium and manganese present in amounts within the area of quadrilateral ABCD shown in FIG. 1; I up to 0.3 percent by weight impurities; 0. l-5.0 percent by weight zinc; and the balance of aluminum;
  • said aluminum alloy additionally comprises up to 0.1 percent by weight silicon.
  • aluminum alloy are within the area of pentagonal DEFGl-l shown in FIG. 1. 7. The method according to claim 5, wherein said aluminum alloy additionally comprises up to 0.2 percent by weight iron.
  • said aluminum alloy additionally comprises up to 0.1 percent by weight silicon.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Laminated Bodies (AREA)
US00227593A 1971-02-24 1972-02-18 Method of forming an integral colored anodic oxide on aluminum pressure die castings Expired - Lifetime US3833484A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP46009521A JPS5141573B1 (OSRAM) 1971-02-24 1971-02-24
JP46033823A JPS5017337B1 (OSRAM) 1971-05-18 1971-05-18
JP46034264A JPS5017338B1 (OSRAM) 1971-05-19 1971-05-19

Publications (1)

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US3833484A true US3833484A (en) 1974-09-03

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US00227593A Expired - Lifetime US3833484A (en) 1971-02-24 1972-02-18 Method of forming an integral colored anodic oxide on aluminum pressure die castings

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US (1) US3833484A (OSRAM)
AT (1) AT312387B (OSRAM)
CA (1) CA986453A (OSRAM)
CH (1) CH580173A5 (OSRAM)
DE (1) DE2207232C3 (OSRAM)
FR (1) FR2126356B1 (OSRAM)
GB (1) GB1382906A (OSRAM)
IT (1) IT948709B (OSRAM)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066368A (en) * 1990-08-17 1991-11-19 Olin Corporation Process for producing black integrally colored anodized aluminum components
US20040056000A1 (en) * 2002-09-20 2004-03-25 C.Y. Hong Surface processing method for a molded metal housing
WO2010109505A1 (en) 2009-03-27 2010-09-30 Politecnico Di Torino Process for coating parts made of aluminium alloy and parts obtained therefrom
WO2010109506A2 (en) 2009-03-27 2010-09-30 Fonderie A. Doglione & C. S.P.A. Self-bearing furniture modules and elements made of metal, in particular made of a die-cast aluminium alloy, and process for their possible surface finishing
CN105177376A (zh) * 2015-07-30 2015-12-23 东莞市晋益电子科技有限公司 一种新型铝合金材料及双金属压铸方法
CN110106403A (zh) * 2019-05-27 2019-08-09 华南理工大学 一种可阳极氧化的Al-Mn系铸造铝合金及其阳极氧化工艺
US10494702B2 (en) 2014-08-27 2019-12-03 Arconic Inc. Aluminum casting alloys having manganese, zinc and zirconium

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH640273A5 (en) * 1978-02-24 1983-12-30 Alusuisse Corrosion-resistant aluminium alloy
JPS56134411A (en) * 1980-03-24 1981-10-21 Fujikura Ltd Aluminum transmission line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470734A (en) * 1935-11-28 1937-08-20 Vaw Ver Aluminium Werke Ag Method of making articles of aluminium alloys with electrolytic oxide coatings
CA671508A (en) * 1963-10-01 C. Fetzer Maurice Composite article including aluminum base alloy and process of making the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107159A (en) * 1956-02-23 1963-10-15 Kaiser Aluminium Chem Corp Colored anodized aluminum article and alloys therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA671508A (en) * 1963-10-01 C. Fetzer Maurice Composite article including aluminum base alloy and process of making the same
GB470734A (en) * 1935-11-28 1937-08-20 Vaw Ver Aluminium Werke Ag Method of making articles of aluminium alloys with electrolytic oxide coatings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
The Surface Treatment of Al & Its Alloys by Wernick et al., 3rd Ed., 1964, p. 56. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066368A (en) * 1990-08-17 1991-11-19 Olin Corporation Process for producing black integrally colored anodized aluminum components
US5403975A (en) * 1990-08-17 1995-04-04 Olin Corporation Anodized aluminum electronic package components
US20040056000A1 (en) * 2002-09-20 2004-03-25 C.Y. Hong Surface processing method for a molded metal housing
WO2010109505A1 (en) 2009-03-27 2010-09-30 Politecnico Di Torino Process for coating parts made of aluminium alloy and parts obtained therefrom
WO2010109506A2 (en) 2009-03-27 2010-09-30 Fonderie A. Doglione & C. S.P.A. Self-bearing furniture modules and elements made of metal, in particular made of a die-cast aluminium alloy, and process for their possible surface finishing
US10494702B2 (en) 2014-08-27 2019-12-03 Arconic Inc. Aluminum casting alloys having manganese, zinc and zirconium
CN105177376A (zh) * 2015-07-30 2015-12-23 东莞市晋益电子科技有限公司 一种新型铝合金材料及双金属压铸方法
CN110106403A (zh) * 2019-05-27 2019-08-09 华南理工大学 一种可阳极氧化的Al-Mn系铸造铝合金及其阳极氧化工艺

Also Published As

Publication number Publication date
FR2126356B1 (OSRAM) 1974-05-10
AU3927972A (en) 1973-08-30
AT312387B (de) 1973-12-27
FR2126356A1 (OSRAM) 1972-10-06
IT948709B (it) 1973-06-11
DE2207232B2 (de) 1975-01-23
CH580173A5 (OSRAM) 1976-09-30
DE2207232A1 (de) 1972-09-14
DE2207232C3 (de) 1975-09-18
CA986453A (en) 1976-03-30
GB1382906A (en) 1975-02-05

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