US3664932A - Objects of aluminum and alloys of aluminum having colored coatings and process - Google Patents
Objects of aluminum and alloys of aluminum having colored coatings and process Download PDFInfo
- Publication number
- US3664932A US3664932A US881846A US3664932DA US3664932A US 3664932 A US3664932 A US 3664932A US 881846 A US881846 A US 881846A US 3664932D A US3664932D A US 3664932DA US 3664932 A US3664932 A US 3664932A
- Authority
- US
- United States
- Prior art keywords
- current
- dissolution
- aluminum
- range
- colored
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 title claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 13
- 239000000956 alloy Substances 0.000 title claims abstract description 13
- 238000004090 dissolution Methods 0.000 claims abstract description 31
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 27
- 150000002736 metal compounds Chemical class 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 11
- 238000009835 boiling Methods 0.000 claims description 10
- 229910000906 Bronze Inorganic materials 0.000 claims description 9
- 239000010974 bronze Substances 0.000 claims description 9
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 15
- 239000002184 metal Substances 0.000 abstract description 14
- 239000003792 electrolyte Substances 0.000 abstract description 12
- 150000003839 salts Chemical class 0.000 abstract description 12
- 239000002245 particle Substances 0.000 abstract description 10
- 239000010410 layer Substances 0.000 description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 239000001117 sulphuric acid Substances 0.000 description 10
- 235000011149 sulphuric acid Nutrition 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 4
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 4
- 239000001166 ammonium sulphate Substances 0.000 description 4
- 235000011130 ammonium sulphate Nutrition 0.000 description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 4
- 239000004327 boric acid Substances 0.000 description 4
- 238000004040 coloring Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000002048 anodisation reaction Methods 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009500 colour coating Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011817 metal compound particle Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229940078494 nickel acetate Drugs 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- C25D11/20—Electrolytic after-treatment
- C25D11/22—Electrolytic after-treatment for colouring layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/18—Visual or acoustic landing aids
- B64F1/20—Arrangement of optical beacons
Definitions
- ABSTRACT The process for providing colored coatings on aluminum and [30] Foreign Application Priority Data alloys of aluminum in which the surface is first anodized to form a porous layer and colored particles of metal compound DEC. 6, 1968 France are deposited in the porous layer y alternating current elec trolysis with the object mounted as an electrode in an elec- [52] U.S. Cl. ..204/35 N, 294/58 trolyte containing the salt of the metal, and then subjecting the [51 II!!- Cl.
- the process of this invention comprises restoring, by anodic dissolution, the clear colors observed during the initial stages of deposition, after a dark or black color effect has been obtained on the object formed of aluminum or alloys thereof, due to the presence of metal or metal compound particles in the pores of the formed layer of alumina.
- anodic dissolution the color turns clear as the treatment progresses and, contrary to what is observed in electrolytic coloring, the color rapidly becomes uniform over the entire surface of the object.
- the anodic dissolution treatment is highly flexible and thus gives more latitude for regulating the production parameters. This is highly advantageous insofar as commercial operation is concerned.
- the object is initially anodized, such as in a sulphuric acid bath, to provide the object with a porous layer of alumina.
- Colored particles of a metal or metal compound are then deposited by electrolysis into the pores of the anodized layer, using a bath containing a dissolved salt of the constituent metal of the particles, giving a dark color effect.
- the electrolysis is operated with alternating current with the object to be coated forming one of the electrodes, while the other electrode, referred to as the counter-electrode, is made either of the constituent metal of the salt dissolved in the electrolyte or of a material which is resistant to the effect of the bath and which does not give rise to any secondary reactions during the electrolysis, such for example as stainless steel.
- anodic dissolution in accordance with the practice of this invention.
- the object to be coated which has a dark color or even a black color due to the presence of an excess of colored particles in the pores of the alumina layer, is mounted as an anode in a continuous current or direct current electrolysis cell. It is believed that the anion of the electrolyte combines with the metal compound deposited in the pores of the alumina layer to form a soluble salt of the metal.
- Anodic dissolution is accompanied by a lightening and standardization of the color due to the decrease and probably to the standardization of the thickness of the deposit. The operation is terminated by cutting the current when the required color has been obtained.
- the dissolution stage is carried out in the same bath and in the same cell as the deposition by electrolysis. It is sufficient, for this purpose, to provide a switching device by which it is possible to change from alternating current to direct current. More simply, it is sufficient to provide a diode or a diode bridge in the circuit for converting the alternating current into a rectified unfiltered current which gives the same results as the direct current.
- the electrolyte comprises an acid solution, and preferably a sulphuric acid solution, of a salt of a metal such as copper,
- the concentration of metal salts dissolved in the electrolyte may range from 0.15 g/liter to an amount to provide a saturated solution.
- the operation is carried out at bath temperature within the range of 5-30 C and preferably of about room temperature, either at a constant current density of less than 5 A/dm and preferably at a current density within the range of 0.1 to 2 A/dm or at a constant voltage within the range of 10 to 50 volts and preferably 15 to 25 volts for a period of from 10 seconds to 30 minutes, and generally from A to l5 minutes.
- the final colored layer can be fixed by any conventional process, such as by sealing in boiling water, varnishing or the like.
- the color obtained is governed by the nature of the metal and the color intensity is governed both by the current density and by the duration of the anodic dissolution for the same initial color effect. For example, a wide range of reds from pink to deep scarlet, including copper shades, can be obtained with an electrolyte containing copper salts.
- the salts of nickel, cadmium or cobalt enable browns or gold hues to be obtained.
- the final appearance is somewhat related to the surface quality of the object before the porous layer of alumina is formed.
- the color effects obtained by the process are brilliant while on a dull or mat surface, a dull or mat color will be secured.
- Such surface changes can be effected by conventional or known means including polishing, buffing, glazing, and the like, depending upon the finish required.
- a mat finish is obtained by cleaning the object for 10 minutes at 50 C in a soda solution having a concentration of 50 g/liter, after which it is washed in a stream of water followed by immersion in nitric acid (36 Be) and then by further rinsing in a stream of water.
- the glossy or shiny finish is obtained by mechanical polishing or by chemical or electrolytic glossing.
- EXAMPLE 1 A 99.5 percent pure aluminum sheet is mechanically treated to provide a satin surface and then anodized in a sulphuric acid bath to give a porous surface layer of alumina having a thickness of 15 microns. It is then colored by mounting as an electrode in an electrolysis cell fed with alternating current in which the electrolyte is a sulphuric acid solution of copper sulphate having the following composition:
- the counter-electrode is made of stainless steel.
- the cell is then converted to direct current with the sheet mounted as the anode.
- the sheet is removed after 3 minutes of treatment at 0.2 A/dm at about 20 C.
- EXAMPLE 2 An aluminum sheet containing 0.6 percent magnesium is chemically treated to provide a shiny finish and then anodized in a sulphuric acid bath to obtain a porous layer of alumina having a thickness of 20 microns. It is then mounted as an electrode in an electrolysis cell fed with alternating current in which the electrolyte is a sulphuric acid solution of copper sulphate having the following composition:
- a sheet which is black in color is produced after minutes of treatment at 0.6 A/dm THe cell is then fed with rectified direct current (unfiltered) with the sheet mounted as the anode. The sheet is removed after 1 minute and 30 seconds treatment at 0.4 A/dm at C.
- a sheet which is bright red in color is produced and sealed in boiling water.
- the color is uniform and brilliant in appearance and resistant to ultra-violet rays and to corrosion.
- EXAMPLE 3 A section of aluminum alloy containing 0.5% silicon and 0.5% magnesium is mechanically polished and then anodized in a sulphuric bath to provide a surface porous layer of alumina having a thickness of 18 microns. It is then colored by mounting as an electrode in an electrolysis cell fed with alternating current in which the electrolyte is a solution of a mixture of boric acid, nickel sulphate and ammonium sulphate:
- the counter-electrode is made of nickel.
- a section which is dark bronze in color is produced after 5 minutes oftreatment at 0.4 A/dm.
- the section is mounted as the anode and the cell is fed with direct current.
- the section is removed after 6 minutes oftreatment at 0.1 A/dm at 25 C.
- the section After sealing in boiling water, the section has a clear, uniform and brilliant bronze colored finish which is resistant to ultra-violet rays and to corrosion.
- EXAMPLE 4 An aluminum alloy section containing 1% by weight silicon, 1% by weight magnesium and 1% by weight manganese is cleaned with soda and then anodized in a sulphuric bath to obtain a porous surface layer of alumina having a thickness of 12 microns. It is then colored by mounting as an electrode in an electrolysis cell fed with alternating current, in which the electrolyte is a solution of a mixture of boric acid, cobalt sulphate and ammonium sulphate:
- the counter-electrode is made of stainless steel.
- the cell is then fed with continuous current or direct cur rent with the section mounted as the anode.
- the section is removed after 4 minutes oftreatment at 0.2 A/dm at 20 C.
- the section After scaling in boiling water, the section has a clear, uniform mat bronze color which is resistant to ultra-violet rays and to corrosion.
- EXAMPLE 5 An aluminum alloy section containing 1% by weight silicon, 1% by weight magnesium and 1% by weight manganese is mechanically polished and then anodized in a sulphuric acid bath to provide a porous surface layer of alumina having a thickness of 15 microns. It is then colored by mounting as an electrode in an electrolysis cell fed with alternating current.
- the electrolyte is a sulphuric acid solution of copper sulphate:
- the counter-electrode is made of copper.
- the cell is then fed with direct current with the section mounted as an anode.
- the section is removed after 2 minutes of treatment at 20 volts at 20 C.
- the section After sealing in boiling water, the section has a uniform and brilliant copper red finish which is resistant to ultra-violet rays and to corrosion.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Acoustics & Sound (AREA)
- Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cookers (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR176899 | 1968-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3664932A true US3664932A (en) | 1972-05-23 |
Family
ID=8657921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US881846A Expired - Lifetime US3664932A (en) | 1968-12-06 | 1969-12-03 | Objects of aluminum and alloys of aluminum having colored coatings and process |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3664932A (xx) |
| BE (1) | BE742732A (xx) |
| CA (1) | CA979843A (xx) |
| CH (1) | CH503796A (xx) |
| DE (1) | DE1961003B2 (xx) |
| ES (1) | ES374264A1 (xx) |
| FR (1) | FR1596808A (xx) |
| GB (1) | GB1297265A (xx) |
| LU (1) | LU59943A1 (xx) |
| NL (1) | NL6918329A (xx) |
| SE (1) | SE364072B (xx) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3787295A (en) * | 1970-04-02 | 1974-01-22 | Alusuisse | Method of electrolytic coloring of oxide layers on aluminum and aluminum base alloys |
| US3878056A (en) * | 1973-08-24 | 1975-04-15 | Sumitomo Chemical Co | Process for electrolytic coloring of the anodic oxide film on a aluminum or aluminum base alloys |
| US3892636A (en) * | 1972-06-06 | 1975-07-01 | Riken Light Metal Ind Co | Method for producing a colored oxide film on an aluminum or aluminum alloy |
| US3962049A (en) * | 1971-05-13 | 1976-06-08 | Kabushiki Kaisha Aiden | Process for coloring aluminum anodic oxide film |
| US4024039A (en) * | 1972-08-31 | 1977-05-17 | Honny Chemicals Company, Ltd. | Coloring methods for aluminum and aluminum alloys |
| US4043880A (en) * | 1975-07-24 | 1977-08-23 | Sumitomo Aluminum Smelting Co., Ltd. | Method for producing green-colored anodic oxide film on aluminum or aluminum base alloy articles |
| US4310586A (en) * | 1978-01-17 | 1982-01-12 | Alcan Research And Development Limited | Aluminium articles having anodic oxide coatings and methods of coloring them by means of optical interference effects |
| US7276293B1 (en) * | 2000-05-24 | 2007-10-02 | Fujikura Ltd. | Far-infrared radiator and method for producing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2197999A1 (en) * | 1972-09-05 | 1974-03-29 | Honny Chemicals Co Ltd | Electrolytic colouration of aluminium articles - using successively altern-ating and direct current |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3382160A (en) * | 1960-03-31 | 1968-05-07 | Asada Tahei | Process for inorganically coloring aluminum |
-
1968
- 1968-12-06 FR FR176899A patent/FR1596808A/fr not_active Expired
-
1969
- 1969-12-03 US US881846A patent/US3664932A/en not_active Expired - Lifetime
- 1969-12-04 LU LU59943D patent/LU59943A1/xx unknown
- 1969-12-04 DE DE19691961003 patent/DE1961003B2/de not_active Withdrawn
- 1969-12-04 SE SE16710/69A patent/SE364072B/xx unknown
- 1969-12-05 CH CH1817269A patent/CH503796A/fr not_active IP Right Cessation
- 1969-12-05 ES ES374264A patent/ES374264A1/es not_active Expired
- 1969-12-05 CA CA069,162A patent/CA979843A/en not_active Expired
- 1969-12-05 GB GB1297265D patent/GB1297265A/en not_active Expired
- 1969-12-05 BE BE742732D patent/BE742732A/xx unknown
- 1969-12-05 NL NL6918329A patent/NL6918329A/xx not_active Application Discontinuation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3382160A (en) * | 1960-03-31 | 1968-05-07 | Asada Tahei | Process for inorganically coloring aluminum |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3787295A (en) * | 1970-04-02 | 1974-01-22 | Alusuisse | Method of electrolytic coloring of oxide layers on aluminum and aluminum base alloys |
| US3962049A (en) * | 1971-05-13 | 1976-06-08 | Kabushiki Kaisha Aiden | Process for coloring aluminum anodic oxide film |
| US3892636A (en) * | 1972-06-06 | 1975-07-01 | Riken Light Metal Ind Co | Method for producing a colored oxide film on an aluminum or aluminum alloy |
| US4024039A (en) * | 1972-08-31 | 1977-05-17 | Honny Chemicals Company, Ltd. | Coloring methods for aluminum and aluminum alloys |
| US3878056A (en) * | 1973-08-24 | 1975-04-15 | Sumitomo Chemical Co | Process for electrolytic coloring of the anodic oxide film on a aluminum or aluminum base alloys |
| US4043880A (en) * | 1975-07-24 | 1977-08-23 | Sumitomo Aluminum Smelting Co., Ltd. | Method for producing green-colored anodic oxide film on aluminum or aluminum base alloy articles |
| US4310586A (en) * | 1978-01-17 | 1982-01-12 | Alcan Research And Development Limited | Aluminium articles having anodic oxide coatings and methods of coloring them by means of optical interference effects |
| US7276293B1 (en) * | 2000-05-24 | 2007-10-02 | Fujikura Ltd. | Far-infrared radiator and method for producing method |
Also Published As
| Publication number | Publication date |
|---|---|
| ES374264A1 (es) | 1972-03-16 |
| NL6918329A (xx) | 1970-06-09 |
| LU59943A1 (xx) | 1970-06-04 |
| DE1961003A1 (de) | 1970-06-18 |
| CA979843A (en) | 1975-12-16 |
| BE742732A (xx) | 1970-06-05 |
| GB1297265A (xx) | 1972-11-22 |
| SE364072B (xx) | 1974-02-11 |
| CH503796A (fr) | 1971-02-28 |
| FR1596808A (xx) | 1970-06-22 |
| DE1961003B2 (de) | 1971-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4014758A (en) | Continuous electrolytical treatment of aluminum or its alloys | |
| US4022671A (en) | Electrolytic coloring of anodized aluminum | |
| US4021315A (en) | Process for electrolytic coloring of the anodic oxide film on aluminum or aluminum base alloys | |
| CA1054089A (en) | Process for electrolytically coloring aluminum and aluminum alloys | |
| CA1059059A (en) | Producing a coloured oxide on an article of aluminium or aluminium alloy | |
| US3664932A (en) | Objects of aluminum and alloys of aluminum having colored coatings and process | |
| US3704209A (en) | Method for electrochemical coloring of aluminum and alloys | |
| US3795590A (en) | Process for coloring aluminum and alloys of aluminum having an anodized surface | |
| GB1580994A (en) | Material for selective absorption of solar energy and production thereof | |
| US3616309A (en) | Method of producing colored coatings on aluminum | |
| US3704210A (en) | Process for coloring aluminum objects | |
| US4430169A (en) | Method of producing green coatings on aluminum and aluminum alloys | |
| US4115212A (en) | Electrolytic coloring process for non anodized aluminum and its alloys | |
| US4632735A (en) | Process for the electrolytic coloring of aluminum or aluminum alloys | |
| JPS5940917B2 (ja) | 電解着色法 | |
| US4806226A (en) | Process for electrolytically coloring aluminum material | |
| EP0936288A2 (en) | A process for producing colour variations on electrolytically pigmented anodized aluminium | |
| JPS5920759B2 (ja) | アルミニウムまたはアルミニウム合金の着色法 | |
| KR950000313B1 (ko) | 알루미늄 또는 알루미늄 합금에 청색을 부여하는 방법 | |
| US3843496A (en) | Method for forming a colored oxide coating on the surfaces of aluminum or aluminum alloy materials | |
| CA1299135C (en) | Process for electrolytically coloring aluminum material | |
| JPS60208497A (ja) | アルミニウム及びアルミニウム合金の電解着色方法 | |
| JPS5943560B2 (ja) | アルミニウムまたはアルミニウム合金の模様入り着色法 | |
| DE1963587C (de) | Verfahren zur Herstellung von gleichmäßig gefärbten anodischen Oxidüberzügen auf Aluminium oder Aluminiumlegierungen | |
| CA1223841A (en) | Method of producing green coatings on aluminum and aluminum alloys |