US3775266A - Process for forming resinous films on anodized aluminum substrates - Google Patents

Process for forming resinous films on anodized aluminum substrates Download PDF

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Publication number
US3775266A
US3775266A US00267045A US3775266DA US3775266A US 3775266 A US3775266 A US 3775266A US 00267045 A US00267045 A US 00267045A US 3775266D A US3775266D A US 3775266DA US 3775266 A US3775266 A US 3775266A
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US
United States
Prior art keywords
aluminum
coating
water
resins
test
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
US00267045A
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English (en)
Inventor
K Ikeda
I Hayashi
T Kato
T Takahashi
T Nagano
K Wada
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.)
Riken Light Metal Industry Co Ltd
Kuboko Paint Co Ltd
Original Assignee
Riken Light Metal Industry Co Ltd
Kuboko Paint Co Ltd
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.)
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Publication date
Application filed by Riken Light Metal Industry Co Ltd, Kuboko Paint Co Ltd filed Critical Riken Light Metal Industry Co Ltd
Application granted granted Critical
Publication of US3775266A publication Critical patent/US3775266A/en
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Expired - Lifetime legal-status Critical Current

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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
    • C25D11/18—After-treatment, e.g. pore-sealing

Definitions

  • a number of processes have hitherto been proposed for treating and finishing aluminum-bearing substrates so that product aluminum articles are resistant to environmental attack, i.e., corrosion by acidic or alkaline atmosphere and present a continuous, smooth, level surface appearance.
  • thermosetting resin coating One of the prior-art processes is an immersiondeposit process wherein pretreated aluminum-bearing substrates may be immersed in an immersion bath containing a thermosetting resin coating, pulled out, disposed to set and heated to harden.
  • highly viscous resin coatings are difficult by such conventional processes to form a smooth, level and thick resinous film on an aluminum surface because the coatings tend to gather locally at the lower part of the surface and because of relatively high surface tension of the coating tending to retard the wetting of the aluminum surface. It is known that the viscosity and surface tension of thermosetting resin coatings decrease with increasing temperature.
  • Various coating processes employing heated coating compositions are known, including, a hot spray coating, a hot airless spray coating and a hot electrostatic coating. Since the coating according to these processes is heated immediately before applying, there are encountered no critical problems associated with preservation of the coating and evaporation of solvents.
  • the inventive concept of this invention resides in a process wherein a pretreated aluminumor aluminum alloy surface, which may be electrically anodized, is immersed without prior filling of cavities formed in the surface by said anodization in a coating composition
  • a coating composition comprising 20 35 percent of one or more of water-soluble thermosetting resins selected from the group consisting of high temperature reaction type acrylic resins, alkyd resins, acrylalkyd resins, melamine resins, phenolic resins, urea resins and aminoalkyd resins and 0.1 10 percent of high boiling, organic amine (stabilizer) such as dimethylethanolamine, monoethanolamine, mono normal propylamine, triethanolamine, tetraethylenepentamine and ethylene diamine, heated at 40 C, and allowed to set, dry and harden at 150 200C over a period of 15 30 minutes.
  • stabilizer such as dimethylethanolamine, monoethanolamine, mono normal propylamine, triethanolamine, tetraethylenepentamine and ethylene diamine
  • Acrylic resins employed herein may be prepared by the process in which one or more of acrylic acid, methacrylic acid and esters thereof having a hydroxy group or other derivatives of acrylic acid are polymerized at 120C in a high boiling water-soluble solvent such as ethylcellosolve, isopropylcellosolve, butylecellosolve, butylcarbinol in the presence of an initiator such as benzoylperoxide, and to the resulting polymers are added alcohol amines of high boiling point thereby obtaining water soluble amine salts.
  • a high boiling water-soluble solvent such as ethylcellosolve, isopropylcellosolve, butylecellosolve, butylcarbinol
  • an initiator such as benzoylperoxide
  • thermosetting resins when added in amounts of less than 20 percent of the coating composition will fail to form a desirably thick film on an aluminum surface, but when added in amounts exceeding 35 percent will produce irregularities in the surface finish.
  • the immersion-deposit process according to the present invention should be carried out at temperatures ranging between 40 70C. Repeated experiments have indicated that temperatures lower than 40C tend to increase objectionably the viscosity of the coating, while temperatures higher than 70C provide inadequate viscosity.
  • the immersion operations need not be repeated any definite number of times, but it is sufficient to dip the aluminum substrate in the immersion bath only until its temperature grows substantially equal to the temperature of the coating.
  • the speed of pulling the substrate out of the immersion bath is also not imperative, but a preferred range of this speed is between 20 and mm/sec. Satisfactory results have been obtained by setting the substrate for 10 15 minutes in the air heated at 30 50C.
  • the substrate should preferably be dried by means of an infrared drying apparatus or a hot air drying apparatus. It has been also found that a firmly adhered film as desired may be obtained by applying to anodized porous aluminum surface a coating which has been heated at a predetermined temperature in accordance with the invention. The coating when heated will readily penetrate into the pores or pits in anodized aluminum surface believably due to increased momenta of the coating particles.
  • EXAMPLES I VIII An aluminum test piece 50 X 50 X 1,000 mm in size was dipped in a caustic soda at 70C to dissolve oxides and other foreign particles thereon, washed with water and subsequently with 10% nitric acid solution at room temperature and again with water. The pretreated test piece was subjected to anodization using a I-1 SO electrolyte operated with a DC 16 volts at a current density of 1 A/dm at a bath temperature of 20C.
  • test piece was hung down longitudinally by a hoist cable and thus dipped for 2 minutes in an immersion bath containing the coating compositions (shown in Table 1) which have been diluted with water of 100 parts or 130 parts and heated at 40C or 60C.
  • the test piece was taken out of the bath of a speed of 50 mm/sec. and disposed to set over a period of 10 minutes at 50C.
  • the coated aluminum surface was then heated in an electrical furnace at a temperature of 180C for 20 minutes, until it was dried and hardened.
  • a smooth and level resinous film was formed on the aluminum test pieces as shown in Table 2.
  • the finished aluminum test piece was subjected to X-ray microanalyzer to reveal the presence of carbon about 2 microns deep in pores of the aluminum surface, indicating a firm deposit of the resin coating on the aluminum surface.
  • the aluminum test piece coated in accordance with Example 1 was subjected to various performance tests as shown in Table 3.
  • a process for coating an aluminum or aluminum alloy surface which comprises: degreasing, cleaning and water-rinsing the surface; etching the water-rinsed surface with an alkaline solution; neutralizing and water-washing the etched surface; anodizing the surface; water-rinsing the anodized surface; immersing the surface in a resin coating composition comprising 20 35 percents of one or mone water-soluble therrnosetting resins selected from the group consisting of high temperature reaction type acrylic resins, alkyd resins, melamine resins, phenolic resins, urea resins and aminoalkyd resins and 0.110 per cent of a high boiling organic amine, said composition being heated at 40 70C; allowing the resins to set; and drying and hardening the coated surface at a temperature of 200C for 15 30 minutes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
US00267045A 1971-06-29 1972-06-28 Process for forming resinous films on anodized aluminum substrates Expired - Lifetime US3775266A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46047404A JPS5812065B1 (enrdf_load_stackoverflow) 1971-06-29 1971-06-29

Publications (1)

Publication Number Publication Date
US3775266A true US3775266A (en) 1973-11-27

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Family Applications (1)

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US00267045A Expired - Lifetime US3775266A (en) 1971-06-29 1972-06-28 Process for forming resinous films on anodized aluminum substrates

Country Status (4)

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US (1) US3775266A (enrdf_load_stackoverflow)
JP (1) JPS5812065B1 (enrdf_load_stackoverflow)
AU (1) AU477153B2 (enrdf_load_stackoverflow)
CA (1) CA971838A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902976A (en) * 1974-10-01 1975-09-02 S O Litho Corp Corrosion and abrasion resistant aluminum and aluminum alloy plates particularly useful as support members for photolithographic plates and the like
US3909371A (en) * 1971-10-22 1975-09-30 Riken Light Metal Ind Co Process for producing a protective film on an aluminum surface
US3930964A (en) * 1971-12-25 1976-01-06 Toshiro Takahashi Method for painting aluminum or aluminum-based alloy material
US3945899A (en) * 1973-07-06 1976-03-23 Kansai Paint Company, Limited Process for coating aluminum or aluminum alloy
US3988217A (en) * 1971-10-22 1976-10-26 Riken Lightmetal Industry Co., Ltd. Process for producing a protective film on an aluminum surface
US4310390A (en) * 1977-08-10 1982-01-12 Lockheed Corporation Protective coating process for aluminum and aluminum alloys
US4356066A (en) * 1980-04-17 1982-10-26 International Business Machines Corporation Process for fabricating a multi-layer magnetic thin film disk
US5205874A (en) * 1990-11-13 1993-04-27 Crews Iv Nathan C Process of protecting metallic and wood surfaces using silicate compounds
US5330635A (en) * 1993-03-25 1994-07-19 Lockheed Corporation Protective coating process for aluminum and aluminum alloys
US5672390A (en) * 1990-11-13 1997-09-30 Dancor, Inc. Process for protecting a surface using silicate compounds
US6358616B1 (en) 2000-02-18 2002-03-19 Dancor, Inc. Protective coating for metals
US20060055084A1 (en) * 2002-12-16 2006-03-16 Corona International Corporation Composite of aluminium material and synthetic resin molding and process for producing the same
US20160071645A1 (en) * 2013-04-08 2016-03-10 Labinal Power Systems Manufacture of coils for electrotechnical components using strips of unsealed anodised aluminium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537433A (en) * 1945-10-12 1951-01-09 Gen Motors Corp Impregnated aluminum oven liner
US2647079A (en) * 1948-06-03 1953-07-28 Sprague Electric Co Production of insulated condenser electrodes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537433A (en) * 1945-10-12 1951-01-09 Gen Motors Corp Impregnated aluminum oven liner
US2647079A (en) * 1948-06-03 1953-07-28 Sprague Electric Co Production of insulated condenser electrodes

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909371A (en) * 1971-10-22 1975-09-30 Riken Light Metal Ind Co Process for producing a protective film on an aluminum surface
US3988217A (en) * 1971-10-22 1976-10-26 Riken Lightmetal Industry Co., Ltd. Process for producing a protective film on an aluminum surface
US3930964A (en) * 1971-12-25 1976-01-06 Toshiro Takahashi Method for painting aluminum or aluminum-based alloy material
US3945899A (en) * 1973-07-06 1976-03-23 Kansai Paint Company, Limited Process for coating aluminum or aluminum alloy
US3902976A (en) * 1974-10-01 1975-09-02 S O Litho Corp Corrosion and abrasion resistant aluminum and aluminum alloy plates particularly useful as support members for photolithographic plates and the like
US4310390A (en) * 1977-08-10 1982-01-12 Lockheed Corporation Protective coating process for aluminum and aluminum alloys
US4356066A (en) * 1980-04-17 1982-10-26 International Business Machines Corporation Process for fabricating a multi-layer magnetic thin film disk
US5672390A (en) * 1990-11-13 1997-09-30 Dancor, Inc. Process for protecting a surface using silicate compounds
US5205874A (en) * 1990-11-13 1993-04-27 Crews Iv Nathan C Process of protecting metallic and wood surfaces using silicate compounds
US5330635A (en) * 1993-03-25 1994-07-19 Lockheed Corporation Protective coating process for aluminum and aluminum alloys
US6358616B1 (en) 2000-02-18 2002-03-19 Dancor, Inc. Protective coating for metals
US20060055084A1 (en) * 2002-12-16 2006-03-16 Corona International Corporation Composite of aluminium material and synthetic resin molding and process for producing the same
US7841577B2 (en) * 2002-12-16 2010-11-30 Corona International Corporation Composite of aluminum material and synthetic resin molding and process for producing the same
US20110031648A1 (en) * 2002-12-16 2011-02-10 Corona International Corporation Process for producing composite of aluminum material and synthetic resin molding
US7919032B2 (en) 2002-12-16 2011-04-05 Corona International Corporation Process for producing composite of aluminum material and synthetic resin molding
US20160071645A1 (en) * 2013-04-08 2016-03-10 Labinal Power Systems Manufacture of coils for electrotechnical components using strips of unsealed anodised aluminium
US10236120B2 (en) * 2013-04-08 2019-03-19 Safran Electrical & Power Manufacture of coils for electrotechnical components using strips of unsealed anodized aluminum

Also Published As

Publication number Publication date
CA971838A (en) 1975-07-29
AU477153B2 (en) 1976-10-14
AU4397472A (en) 1974-01-03
JPS5812065B1 (enrdf_load_stackoverflow) 1983-03-05

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