US3787246A - Process for producing a protective color film on an aluminum substrate - Google Patents

Process for producing a protective color film on an aluminum substrate Download PDF

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Publication number
US3787246A
US3787246A US00160110A US3787246DA US3787246A US 3787246 A US3787246 A US 3787246A US 00160110 A US00160110 A US 00160110A US 3787246D A US3787246D A US 3787246DA US 3787246 A US3787246 A US 3787246A
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United States
Prior art keywords
aluminum
percent
coating
aluminum substrate
producing
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US00160110A
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English (en)
Inventor
T Takahashi
T Nagano
M Suzuki
K Ikeda
T Kato
N Minagawa
H Tagai
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al

Definitions

  • ABSTRACT A process is disclosed for producing a firmly adhered colored film on an aluminum substrate without anodization. The process is carried out at certain temperatures and in the presence of specified quantities of organic amines which amines act to cause a coating to adhere intimately to the aluminum surface and impart a clear amber color to the coating.
  • This invention relates to a process of producing on an aluminum surface a protective, ornamental film. More specifically, the present invention is concerned with the process in which an aluminum substrate is coated by immersion-deposit with a continuous, smooth and firmly adhered resinous film. Yet more specifically, the invention is concerned with the aluminum surface treatment in which there is provided on an aluminum surface an attractively colored coating without addition of any coloring dyes or chemicals.
  • An aluminum substrate is subjected to anodization in an electrolyte bath to provide a porous oxidized film on the aluminum surface.
  • an organic dye or otherwise coloring metal or metal oxide is thereafter treated to fill in the pores on its surface and/or finished with a transparent coating.
  • Anodized aluminum surface is coated with a color paint.
  • Aluminum is alloyed with different colorproducing metals and anodized.
  • the anodized aluminum alloy is subjected to porosity-sealing treatment and/or finished with a transparent coating.
  • Aluminum substrate is immersed in a bath containing various kinds of chemicals thereby chemically forming a colored oxidized film on its surface.
  • the aluminum surface is finished with a transparent coating.
  • Color paints are applied directly onto an aluminium surface.
  • an aluminum surface turns from grey to black in color when the aluminum is treated for boehmite formation in a boiling water containing silicic acid or sodium hydroxide; and an aluminum surface when treated with water heated at about C grows coarse, evidencing the formation thereon of a dark grey bayerite film.
  • a preferred process according to the invention essentially comprises cleaning an aluminum substrate with warm dilute caustic soda, immersing the aluminum for at least 5 minutes in distilled water or desalted water containing 0.1 10 percent of an organic amine selected from the group consisting of dimethylethanolamine, monoethanolamine, triethanolamine, mono-normal-propylamine, tetraethylenepentamine and ethylenediamine, heated at 4090C., immersing said aluminum in a coating composition comprising 20-50 percent of one or more of water-soluble thermosetting resins selected from the group consisting of acrylic, alkyd, melamine, phenolic, urea and aminoalkyd resins and 0.1-10 percent of said organic amine and maintained at room temperature, and allowing the thus coated aluminum surfaces to set, dry and harden at l50200C over a period of 15-30 minutes.
  • an organic amine selected from the group consisting of dimethylethanolamine, monoethanolamine, triethanolamine, mono-normal-propylamine, tetraethylenepentamine and
  • An alternative process of the invention comprises cleaning a starting aluminum substrate with warm dilute caustic soda, immersing the aluminum at least for 5 minutes in a coating composition comprising 20-50 percent of one or more of water-soluble thermosetting resins selected from the group consisting of acrylic, alkyd, melamine, phenolic, urea and aminoalkyd resins and 0.1-l0 percent of an organic amine selected from the group consisting of dimethylethanolamine, monoethanolamine, triethanolamine, mono-normalpropylamine, tetraethylenepentamine and ethylenediamine and heated at 40 C and allowing the thus coated aluminum surfaces to set, dry and harden at l50200C over a period of 15-30 minutes.
  • a coating composition comprising 20-50 percent of one or more of water-soluble thermosetting resins selected from the group consisting of acrylic, alkyd, melamine, phenolic, urea and aminoalkyd resins and 0.1-l0 percent of an organic amine selected from the group consisting of dimethylethanolamine, monoethanol
  • amber color produced on treated aluminum surfaces is believed to be attributable to the fact that the boehmite or bayerite layer is partially reduced by amine and deposits itself in infinitesimally small particles on the aluminum surface, which particles absorb certain selected spectrum.
  • EXAMPLE I An aluminum workpiece was dipped in a 10 percent caustic soda solution heated at 70C to dissolve foreign particles therein, washed with water and subsequently with percent nitric acid solution at room temperature and again with water. The aluminum workpiece thus pretreated was immersed in distilled water containing different quantities of ETHODUOMEEN (tradename for ethylene oxide adduct of fatty acid diamine) and heated at different temperatures and for different lengths of time as specified in Table 1 below.
  • ETHODUOMEEN tradename for ethylene oxide adduct of fatty acid diamine
  • Example II The procedure of Example I was followed in pretreating an aluminum workpiece.
  • the coating composition was also the same as in Example 1 except that triethanolamine was used in place of triethylamine.
  • the pretreated aluminum workpiece was immersed in the coating composition for 20 minutes at different temperatures. The workpiece thus coated was pulled out,
  • the alummum workp1ece thus under-coated and col- Ethylene oxide adduct of coconut 40 20 3 ored was immersed in a coating composition identified ?*g ;g 60 20 2 l'l in Table 2 below. Th1s 1mmers1on was continued for l 0 minute at room temperature. The workpiece thus overcoated was pulled out, drained for 3 minutes, allowed to set for 8 minutes and thereafter heated at 180C for EXAMPLE IV 30 minutes to harden the coating, whereupon there was produced a continuous, uniform, colored film on the aluminum workpiece.
  • Example I The procedure of Example I was followed in pretreating an aluminum workpiece.
  • the coating composition used in the instant Example was the same as in Example I except that the various amines listed in Table 4 were used in place of triethylamine.
  • the workpiece was immersed in the coating composition at the temperatures and for the duration of times that are listed in Table 4.
  • the coated workpiece was pulled out, drained for 3 minutes, set for 8 minutes and heated at C for 30 minutes.
  • the finished workpiece exhibited the results of ductility test and color appearance which are comparable to those shown in Example lll.
  • a process for producing a coating on an aluminum substrate comprising a coat of a resin which is derived from an originally water-soluble thermosetting which is an acrylic, an alkyd, a melamine, phenolic, urea and aminoalkyd resins or a mixture thereof, comprising cleaning said aluminum substrate with warm diluted caustic soda, immersing the aluminum at least for 5 minutes in an aqueous composition comprising 50 percent of at least one water-soluble thermosetting resin which is selected from the group consisting of acrylic, alkyd, melamine, phenolic, urea and aminoalkyd resins and 0.1 10 percent of an organic amine' selected from the group consisting of dimethylethanolamine, monoethanolamine, triethanolamine, mono-normal-propylamine, tetraethylenepentamine and ethylenediamine at 40 C and then allowing the thus coated aluminum surfaces to set, dry and harden at 200C over a period of 15 30 minutes.
  • a resin which is derived from an originally water-soluble thermosetting which is an acrylic,
  • composition comprises an acrylic resin, a melamine resin 8 percent water and about 50 percent of at least one aliphatic hydroxy compound miscible with water.
  • composition comprises 25.8 percent of an acrylic resin, 6.4 percent of a melamine resin, 3.2 percent of triethylamine, l9.l percent of glycol, 30.2 percent of isopropyl alcohol, 8 percent water, 7.3 percent of a surfactant.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
US00160110A 1970-07-07 1971-07-06 Process for producing a protective color film on an aluminum substrate Expired - Lifetime US3787246A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45059267A JPS5231890B1 (enrdf_load_stackoverflow) 1970-07-07 1970-07-07

Publications (1)

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US3787246A true US3787246A (en) 1974-01-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4327152A (en) * 1980-09-29 1982-04-27 Lockheed Corporation Protective coating to retard crack growth in aluminum alloy
US5512111A (en) * 1993-04-14 1996-04-30 Sumitomo Light Metal Industries, Ltd. Aluminum alloy material for shutter of recording medium cassette, process for producing the same, and aluminum alloy shutter made of the same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1551613A (en) * 1923-03-07 1925-09-01 Aluminum Co Of America Coated aluminum articles and process and means for producing same
US2859148A (en) * 1954-12-16 1958-11-04 Aluminium Walzwerke Singen Method of producing a bohmite layer on etched aluminum foils
US2911332A (en) * 1956-05-25 1959-11-03 Kelsey Hayes Co Process of coating metal and resulting articles
US3154438A (en) * 1961-03-15 1964-10-27 Hooker Chemical Corp Process for treating metal surfaces
US3258339A (en) * 1964-05-28 1966-06-28 Harris Intertype Corp Lithographic plate and method of preparing same
US3285788A (en) * 1963-06-14 1966-11-15 Du Pont Anhydrous chromic acid solution and process of treating metal therewith
US3380860A (en) * 1964-01-27 1968-04-30 Lord Corp Treatment of aluminum, compositions therefor and products thereof
US3531332A (en) * 1968-09-24 1970-09-29 Olin Corp Process for treating aluminum base articles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1551613A (en) * 1923-03-07 1925-09-01 Aluminum Co Of America Coated aluminum articles and process and means for producing same
US2859148A (en) * 1954-12-16 1958-11-04 Aluminium Walzwerke Singen Method of producing a bohmite layer on etched aluminum foils
US2911332A (en) * 1956-05-25 1959-11-03 Kelsey Hayes Co Process of coating metal and resulting articles
US3154438A (en) * 1961-03-15 1964-10-27 Hooker Chemical Corp Process for treating metal surfaces
US3285788A (en) * 1963-06-14 1966-11-15 Du Pont Anhydrous chromic acid solution and process of treating metal therewith
US3380860A (en) * 1964-01-27 1968-04-30 Lord Corp Treatment of aluminum, compositions therefor and products thereof
US3258339A (en) * 1964-05-28 1966-06-28 Harris Intertype Corp Lithographic plate and method of preparing same
US3531332A (en) * 1968-09-24 1970-09-29 Olin Corp Process for treating aluminum base articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4327152A (en) * 1980-09-29 1982-04-27 Lockheed Corporation Protective coating to retard crack growth in aluminum alloy
US5512111A (en) * 1993-04-14 1996-04-30 Sumitomo Light Metal Industries, Ltd. Aluminum alloy material for shutter of recording medium cassette, process for producing the same, and aluminum alloy shutter made of the same

Also Published As

Publication number Publication date
JPS5231890B1 (enrdf_load_stackoverflow) 1977-08-18

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