EP2942423B1 - Method for treating surface of aluminum alloy - Google Patents
Method for treating surface of aluminum alloy Download PDFInfo
- Publication number
- EP2942423B1 EP2942423B1 EP14861982.8A EP14861982A EP2942423B1 EP 2942423 B1 EP2942423 B1 EP 2942423B1 EP 14861982 A EP14861982 A EP 14861982A EP 2942423 B1 EP2942423 B1 EP 2942423B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aluminum alloy
- aluminum
- oxide film
- solution
- degreasing
- 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.)
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- 229910000838 Al alloy Inorganic materials 0.000 title claims description 119
- 238000000034 method Methods 0.000 title claims description 36
- 238000000227 grinding Methods 0.000 claims description 55
- 239000000243 solution Substances 0.000 claims description 40
- 238000005238 degreasing Methods 0.000 claims description 33
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 27
- 238000005530 etching Methods 0.000 claims description 21
- 239000012535 impurity Substances 0.000 claims description 20
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 230000002378 acidificating effect Effects 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 13
- 239000004327 boric acid Substances 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004040 coloring Methods 0.000 claims description 6
- 239000008151 electrolyte solution Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000003973 alkyl amines Chemical class 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 description 61
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 61
- 239000003795 chemical substances by application Substances 0.000 description 20
- 235000010338 boric acid Nutrition 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 10
- 229960002645 boric acid Drugs 0.000 description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229960004494 calcium gluconate Drugs 0.000 description 4
- 235000013927 calcium gluconate Nutrition 0.000 description 4
- 239000004227 calcium gluconate Substances 0.000 description 4
- NEEHYRZPVYRGPP-UHFFFAOYSA-L calcium;2,3,4,5,6-pentahydroxyhexanoate Chemical compound [Ca+2].OCC(O)C(O)C(O)C(O)C([O-])=O.OCC(O)C(O)C(O)C(O)C([O-])=O NEEHYRZPVYRGPP-UHFFFAOYSA-L 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 3
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical compound [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 2
- 239000010407 anodic oxide Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 150000002815 nickel Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910017665 NH4HF2 Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- -1 borate ions Chemical class 0.000 description 1
- 125000005619 boric acid group Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910009112 xH2O Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
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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
- C25D11/16—Pretreatment, e.g. desmutting
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/20—Acidic compositions for etching aluminium or alloys thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
-
- 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
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/243—Chemical after-treatment using organic dyestuffs
-
- 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
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
Definitions
- the present invention relates to a method of surface-treating an aluminum alloy comprising the features of the preamble portion of claim 1.
- the surface of an aluminum alloy subjected to a rolling or extrusion process includes rough marks, and thus such a rough surface of the aluminum alloy is removed by mechanical grinding and etching.
- An anodic oxidation method which is a metal surface treatment method, is referred to as an alumite process.
- anodic oxidation method which is a metal surface treatment method
- aluminum or an aluminum alloy is immersed in a solution of sulfuric acid, oxalic acid or chromic acid so as to undergo anodic electrolysis, anodic oxidation occurs, thus forming an anodic oxide film (Al 2 O 3 • xH 2 O) on the surface of aluminum, ultimately enhancing corrosion resistance and surface hardness of the aluminum alloy.
- the anodic oxidation method enables the anodic oxide film to be colored via adsorption with a dye. Hence, this metal surface treatment method is widely useful.
- Korean Patent Application Publication No. 10-2005-0118918 entitled “A surface treatment method of aluminum and white-board product thereby”, includes a pretreatment process for immersing an aluminum sheet in a mixed aqueous solution of acidic ammonium fluoride and calcium gluconate.
- Korean Patent No. 10-0864316 entitled “Method of chemical treatment for surface of aluminum pipe for organic photo conductor drum”, discloses an increase in gloss of the aluminum pipe, including immersing the aluminum pipe in a 5 ⁇ 20 %(w/v) ammonium fluoride solution containing 0.001 ⁇ 0.03 wt% of a hydrofluoric acid additive for 1 ⁇ 5 min so as to be acid-etched.
- a method of surface-treating an aluminum alloy comprising the features of the preamble portion of claim 1 is known from WO 2012/119306 A1 .
- US 3,228,816 A1 teaches a three-constituent acid composition for etching and, alternatively, a two-constituent acid composition.
- the three-constituent acid composition is composed predominately of water with minor portions of nitric, hydrofluoric and boric acids.
- the two-constituent acid composition is composed predominately of water with minor portions of nitric and fluoboric acids.
- the acid composition is critical to both as to the components and their proportions, particularly with respect to the relative concentrations of the fluoride and borate ions, and is also critical as to the range of operating temperatures.
- Hyperfluoric acid is considered as etchant virgorously attacking aluminum and its alloys while borate acts as passivating agent providing a retarding or inhibiting effect.
- the action on the metal is said to increase but the solution is insufficient to adequately polish the metal.
- nitric acid is taught as oxidizing agent which comes into play at temperatures above 160°F.
- US 3,228,816 A1 suggests an operating temperature for the disclosed solutions between 160°F and 200°F, i.e 71,1°C to 93,3°C.
- an object of the present invention is to provide an alternative method of surface-treating an aluminum alloy, wherein scratches and grinding pad marks generated on the surface of an aluminum alloy by mechanical grinding may be effectively removed, and a high-gloss surface of the aluminum alloy may be obtained, regardless of anodic oxidation time.
- the present invention provides a method as defined in claim 1.
- scratches and grinding pad marks generated on the surface of an aluminum alloy by mechanical grinding can be effectively removed, and a high-gloss surface of the aluminum alloy can be obtained regardless of the anodic oxidation time.
- FIG. 1 illustrates a process of surface-treating an aluminum alloy according to an embodiment of the present invention
- FIG. 2 schematically illustrates the surface of the aluminum alloy before (a) and after (b) the third step of FIG. 1 .
- the method of surface-treating an aluminum alloy according to an embodiment of the present invention includes pretreating aluminum or an aluminum alloy prepared by extrusion or rolling.
- such pretreatment includes grinding the surface of the prepared aluminum alloy (S100) and immersing the ground aluminum alloy in a degreasing solution having a predetermined composition, thus degreasing the surface of the aluminum alloy to remove impurities therefrom (S200).
- Grinding the surface of the aluminum alloy (S100) is a step (S100) of mechanically grinding the prepared aluminum or aluminum alloy using a variety of grinding agents including oil or fat grinding agents by means of any grinder, but the present invention is not particularly limited thereto.
- impurities or grinding agent may remain on the surface of the aluminum or aluminum alloy due to the mechanical grinding. These impurities have to be removed.
- the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes immersing the ground aluminum or aluminum alloy in a degreasing solution having a predetermined composition, and thereby the impurities or remaining grinding agent on the surface of the aluminum or aluminum alloy are removed by degreasing (S200).
- removing the impurities or remaining grinding agent by degreasing may be performed in such a manner that the impurities or remaining grinding agent are removed from the surface of the aluminum or aluminum alloy using a degreasing solution including various nonionic surfactants and sulfuric acid (H 2 SO 4 ).
- the degreasing solution is prepared by mixing 1 L of water with 3 ⁇ 10% of alkylamine ethoxylate or alcohol ethoxylate and 3 ⁇ 10% of sulfuric acid based on the total weight thereof.
- the aluminum or aluminum alloy is immersed in the degreasing solution under various temperatures and time conditions, thus removing the impurities or remaining grinding agent.
- the aluminum or aluminum alloy is immersed in the degreasing solution at 50 ⁇ 60°C for 3 ⁇ 10 min to remove any impurities or remaining grinding agent.
- removing the impurities or remaining grinding agent by degreasing may be effectively implemented by applying ultrasonic waves or vibration to the aluminum or aluminum alloy, which is immersed in the degreasing solution, or by shaking the degreasing solution.
- the aluminum or aluminum alloy prepared by rolling or extrusion has a rough surface due to the nature of the corresponding process. As such, limitations are imposed on the removal of such a rough surface by the mechanical grinding step (S100) and the degreasing step (S200).
- the rough surface may be removed to some extent by the mechanical grinding step (S100) and the degreasing step (S200). As illustrated in FIG. 2(a) , however, fine grinding pad marks or scratches may be present after the degreasing step (S200).
- the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes immersing the aluminum or aluminum alloy in an etching solution having a predetermined composition, and thereby the fine grinding pad marks or scratches existing on the surface of the aluminum or aluminum alloy may be removed by etching, and simultaneously, a transparent glossy film as illustrated in FIG. 2(b) is formed (S300).
- the etching solution is prepared by heat-dissolving 45 ⁇ 475 g of acidic ammonium fluoride in a mixed solution resulting from mixing 1 L of water and 1 ⁇ 9% of boric acid based on the total weight thereof.
- the acidic ammonium fluoride may be any one selected from among NH 4 F, NH 4 HF and NH 4 HF 2 , and the boric acid is preferably ortho-boric acid that is represented by H 3 BO 3 and is colorless, transparent or lustrous.
- etching solution comprising acidic ammonium fluoride and boric acid as above is used is as follows: when using a conventional etching solution comprising an acidic ammonium fluoride aqueous solution or a mixed aqueous solution of acidic ammonium fluoride and calcium gluconate or hydrofluoric acid, it is possible to obtain the surface of aluminum or an aluminum alloy without fine grinding pad marks or scratches.
- the etching solution comprising acidic ammonium fluoride and boric acid is useful.
- forming the transparent glossy film (S300) may be performed under various temperature and time conditions.
- forming the transparent glossy film (S300) is conducted by immersing the aluminum or aluminum alloy in the etching solution at room temperature (about 25°C) for 1 ⁇ 10 min.
- the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes subjecting the aluminum or aluminum alloy having the transparent glossy film to anodic oxidation, thus forming an oxide film at a predetermined thickness on the surface of the aluminum or aluminum alloy (S400).
- Forming the oxide film (S400) may be implemented using an electrolytic solution comprising any one or a mixture of two or more selected from among sulfuric acid, oxalic acid and chromic acid.
- sulfuric acid H 2 SO 4
- the aluminum alloy is immersed in the sulfuric acid electrolytic solution at 20°C and a voltage of 14 V is then applied for 50 min, thus forming a 20 ⁇ 22 ⁇ m thick oxide film.
- the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes post-treating the aluminum or aluminum alloy.
- post-treatment may include coloring and polishing the surface of the aluminum alloy having the oxide film (S500) and sealing the colored and polished aluminum alloy (S600).
- the aluminum or aluminum alloy may be variously colored via the coloring and polishing (S500), and the polishing process may be performed using any mechanical means, but the present invention is not limited thereto.
- the method of surface-treating the aluminum alloy according to the embodiment of the present invention may include sealing the aluminum or aluminum alloy (S600).
- the sealing step (S600) indicates a process of sealing micropores of the oxide film formed by anodic oxidation to thus modify the properties including corrosion resistance, etc.
- the sealing step (S600) according to the embodiment of the present invention may be conducted using various sealing processes such as sealing by hydration, metal salt sealing and organic compound sealing.
- the sealing step (S600) is performed via metal salt sealing by immersing the aluminum or aluminum alloy having the oxide film in a metal salt aqueous solution.
- nickel is used for the metal salt, and the aluminum or aluminum alloy is immersed in a nickel salt aqueous solution at 60 ⁇ 80°C for 10 min, thus ensuring a high-gloss surface of the aluminum or aluminum alloy.
- the method of surface-treating the aluminum alloy enables scratches and grinding pad marks generated on the surface of the aluminum or aluminum alloy by mechanical grinding to be effectively removed via the aforementioned steps.
- a high-gloss surface of the aluminum alloy may be obtained.
- FIGS. 1 and 2 Below is a detailed description of an embodiment of the present invention in conjunction with FIGS. 1 and 2 .
- a method of surface-treating an aluminum alloy according to an embodiment of the present invention includes pretreating aluminum or an aluminum alloy prepared by extrusion or rolling.
- the pretreating process includes grinding the surface of the prepared aluminum alloy (S100) and immersing the ground aluminum alloy in a degreasing solution having a predetermined composition to remove impurities remaining on the surface of the aluminum alloy by degreasing (S200).
- grinding the surface of the aluminum alloy (S100) is a step (S100) of mechanically grinding the prepared aluminum or aluminum alloy using a variety of grinding agents including oil or fat grinding agents.
- impurities or grinding agent may be left behind on the surface of the aluminum or aluminum alloy due to the mechanical grinding. There is a need to remove these remaining impurities.
- immersing the ground aluminum or aluminum alloy in a degreasing solution having a predetermined composition is performed, so that the surface of the aluminum or aluminum alloy is degreased to remove the impurities or remaining grinding agent therefrom (S200).
- removal of the impurities or remaining grinding agent by degreasing may be carried out by removing the impurities or remaining grinding agent from the surface of the aluminum or aluminum alloy using a degreasing solution including a nonionic surfactant and sulfuric acid (H 2 SO 4 ).
- the degreasing solution may be prepared by mixing 1 L of water with 6.5% of alkylamine ethoxylate or alcohol ethoxylate and 6.5% of sulfuric acid on the total weight thereof.
- the aluminum or aluminum alloy is immersed in the degreasing solution at 55°C for 6 min, thus removing the impurities or remaining grinding agent.
- removing the impurities or remaining grinding agent by degreasing may be effectively implemented by applying ultrasonic waves or vibration to the aluminum or aluminum alloy, which is immersed in the degreasing solution, or by shaking the degreasing solution.
- the aluminum or aluminum alloy prepared by rolling or extrusion has a rough surface due to the nature of the corresponding process. As such, the removal of such a rough surface by the mechanical grinding step (S100) and the degreasing step (S200) is limited.
- the rough surface may be removed to some extent by the mechanical grinding step (S100) and the degreasing step (S200). As illustrated in FIG. 2(a) , however, fine grinding pad marks or scratches may be present after the degreasing step (S200).
- the etching solution may be prepared by heat-dissolving 260 g of acidic ammonium fluoride in a mixed solution resulting from mixing 1 L of water and 5% of boric acid based on the total weight thereof.
- the acidic ammonium fluoride may include NH 4 F, and the boric acid may be ortho-boric acid that is represented by H 3 BO 3 and is colorless, transparent or lustrous.
- etching solution comprising acidic ammonium fluoride and boric acid as above is used is as follows: when using a conventional etching solution comprising an acidic ammonium fluoride aqueous solution or a mixed aqueous solution of acidic ammonium fluoride and calcium gluconate or hydrofluoric acid, it is possible to obtain the surface of aluminum or an aluminum alloy without fine grinding pad marks or scratches.
- the etching solution comprising acidic ammonium fluoride and boric acid is useful.
- forming the transparent glossy film (S300) may be performed by immersing the aluminum or aluminum alloy in the etching solution at room temperature (25°C) for 5 min.
- forming the oxide film (S400) may be carried out using an electrolytic solution comprising sulfuric acid.
- the aluminum alloy is immersed in the sulfuric acid electrolytic solution at 20°C, followed by applying a voltage of 14 V for 50 min, thus forming a 20 ⁇ m thick oxide film.
- step (S400) of forming the oxide film post-treating the aluminum or aluminum alloy is conducted.
- post-treatment may include coloring and polishing the surface of the aluminum alloy having the oxide film (S500) and sealing the colored and polished aluminum alloy (S600).
- step (S500) of coloring and polishing sealing the aluminum or aluminum alloy (S600) is carried out.
- the sealing step (S600) is conducted via metal salt sealing in such a manner that the aluminum or aluminum alloy having the oxide film is immersed in a metal salt aqueous solution.
- nickel is used for the metal salt, and the aluminum or aluminum alloy is immersed in a nickel salt aqueous solution at 70°C for 10 min, thereby ensuring a high-gloss surface of the aluminum or aluminum alloy.
- the aforementioned steps of the method of surface-treating the aluminum alloy according to the present invention are effective at removing scratches and grinding pad marks generated on the surface of the aluminum or aluminum alloy by mechanical grinding.
- the aluminum alloy may have a high-gloss surface, regardless of the anodic oxidation time.
- a method of surface-treating an aluminum alloy can effectively remove scratches and grinding pad marks generated by mechanical grinding.
- an aluminum alloy having high gloss can be manufactured, and thus the present invention is industrially applicable.
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- ing And Chemical Polishing (AREA)
- Chemical Treatment Of Metals (AREA)
Description
- The present invention relates to a method of surface-treating an aluminum alloy comprising the features of the preamble portion of claim 1.
- Typically, the surface of an aluminum alloy subjected to a rolling or extrusion process includes rough marks, and thus such a rough surface of the aluminum alloy is removed by mechanical grinding and etching.
- An anodic oxidation method, which is a metal surface treatment method, is referred to as an alumite process. Specifically, when aluminum or an aluminum alloy is immersed in a solution of sulfuric acid, oxalic acid or chromic acid so as to undergo anodic electrolysis, anodic oxidation occurs, thus forming an anodic oxide film (Al2O3 • xH2O) on the surface of aluminum, ultimately enhancing corrosion resistance and surface hardness of the aluminum alloy.
- In addition to the enhancements in corrosion resistance and surface hardness of the aluminum alloy as mentioned above, the anodic oxidation method enables the anodic oxide film to be colored via adsorption with a dye. Hence, this metal surface treatment method is widely useful.
- As for conventional anodic oxidation, however, as the anodic oxidation time increases, the surface gloss of the aluminum alloy may decrease. Even when the surface of the aluminum alloy having low gloss is subjected to polishing after anodic oxidation, it is difficult to ensure a high-gloss surface of the aluminum alloy.
- With the aim of alleviating these problems, Korean Patent Application Publication No.
10-2005-0118918 - Also, Korean Patent No.
10-0864316 - However, when the acidic ammonium fluoride is used alone or in combination in the form of a mixed aqueous solution with calcium gluconate or hydrofluoric acid in this way, a white film may be obtained but may be opaque and dull, making it difficult to ensure a high-gloss surface of the aluminum alloy.
- A method of surface-treating an aluminum alloy comprising the features of the preamble portion of claim 1 is known from
WO 2012/119306 A1 . - Further,
US 3,228,816 A1 teaches a three-constituent acid composition for etching and, alternatively, a two-constituent acid composition. The three-constituent acid composition is composed predominately of water with minor portions of nitric, hydrofluoric and boric acids. The two-constituent acid composition is composed predominately of water with minor portions of nitric and fluoboric acids. According toUS 3,228,816 A1 the acid composition is critical to both as to the components and their proportions, particularly with respect to the relative concentrations of the fluoride and borate ions, and is also critical as to the range of operating temperatures. Hyperfluoric acid is considered as etchant virgorously attacking aluminum and its alloys while borate acts as passivating agent providing a retarding or inhibiting effect. At temperatures of around 200°F, i.e. 93,3°C, the action on the metal is said to increase but the solution is insufficient to adequately polish the metal. In this context nitric acid is taught as oxidizing agent which comes into play at temperatures above 160°F. For these reasonsUS 3,228,816 A1 suggests an operating temperature for the disclosed solutions between 160°F and 200°F, i.e 71,1°C to 93,3°C. - Accordingly, the present invention has been made keeping in mind the above problems encountered in the related art, and an object of the present invention is to provide an alternative method of surface-treating an aluminum alloy, wherein scratches and grinding pad marks generated on the surface of an aluminum alloy by mechanical grinding may be effectively removed, and a high-gloss surface of the aluminum alloy may be obtained, regardless of anodic oxidation time.
- In order to accomplish the above object, the present invention provides a method as defined in claim 1.
- Advantageous embodiments are indicated in further claims.
- According to the present invention, scratches and grinding pad marks generated on the surface of an aluminum alloy by mechanical grinding can be effectively removed, and a high-gloss surface of the aluminum alloy can be obtained regardless of the anodic oxidation time.
-
-
FIG. 1 illustrates a process of surface-treating an aluminum alloy according to an embodiment of the present invention; and -
FIG. 2 schematically illustrates the surface of the aluminum or aluminum alloy before (a) and after (b) the third step ofFIG. 1 . - The terms used in the present invention are possibly selected from among currently well-known terms, some of the terms mentioned in the description of the present invention have been selected by the applicant, the detailed meanings of which should be understood not simply by the actual terms used but by the meaning of each term in the detailed description of the invention or in consideration of the meanings used.
- Hereinafter, a detailed description will be given of the technical construction of the present invention with reference to preferred embodiments illustrated in the appended drawings.
- In regard thereto,
FIG. 1 illustrates a process of surface-treating an aluminum alloy according to an embodiment of the present invention, andFIG. 2 schematically illustrates the surface of the aluminum alloy before (a) and after (b) the third step ofFIG. 1 . - As illustrated in
FIGS. 1 and2 , the method of surface-treating an aluminum alloy according to an embodiment of the present invention includes pretreating aluminum or an aluminum alloy prepared by extrusion or rolling. - As such, such pretreatment includes grinding the surface of the prepared aluminum alloy (S100) and immersing the ground aluminum alloy in a degreasing solution having a predetermined composition, thus degreasing the surface of the aluminum alloy to remove impurities therefrom (S200).
- Below is a description of these pretreatment steps (S100 and S200) .
- Grinding the surface of the aluminum alloy (S100) is a step (S100) of mechanically grinding the prepared aluminum or aluminum alloy using a variety of grinding agents including oil or fat grinding agents by means of any grinder, but the present invention is not particularly limited thereto.
- After the step (S100) of grinding the surface of the aluminum alloy, impurities or grinding agent may remain on the surface of the aluminum or aluminum alloy due to the mechanical grinding. These impurities have to be removed.
- In order to remove any impurities or remaining grinding agent, the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes immersing the ground aluminum or aluminum alloy in a degreasing solution having a predetermined composition, and thereby the impurities or remaining grinding agent on the surface of the aluminum or aluminum alloy are removed by degreasing (S200).
- As such, removing the impurities or remaining grinding agent by degreasing (S200) may be performed in such a manner that the impurities or remaining grinding agent are removed from the surface of the aluminum or aluminum alloy using a degreasing solution including various nonionic surfactants and sulfuric acid (H2SO4).
- In a preferred embodiment of the present invention, the degreasing solution is prepared by mixing 1 L of water with 3 ∼ 10% of alkylamine ethoxylate or alcohol ethoxylate and 3 ∼ 10% of sulfuric acid based on the total weight thereof.
- The aluminum or aluminum alloy is immersed in the degreasing solution under various temperatures and time conditions, thus removing the impurities or remaining grinding agent. In a preferred embodiment of the present invention, the aluminum or aluminum alloy is immersed in the degreasing solution at 50 ∼ 60°C for 3 ∼ 10 min to remove any impurities or remaining grinding agent.
- Also, removing the impurities or remaining grinding agent by degreasing (S200) may be effectively implemented by applying ultrasonic waves or vibration to the aluminum or aluminum alloy, which is immersed in the degreasing solution, or by shaking the degreasing solution.
- Meanwhile, the aluminum or aluminum alloy prepared by rolling or extrusion has a rough surface due to the nature of the corresponding process. As such, limitations are imposed on the removal of such a rough surface by the mechanical grinding step (S100) and the degreasing step (S200).
- Specifically, the rough surface may be removed to some extent by the mechanical grinding step (S100) and the degreasing step (S200). As illustrated in
FIG. 2(a) , however, fine grinding pad marks or scratches may be present after the degreasing step (S200). - Even when the surface of the aluminum or aluminum alloy including such fine grinding pad marks or scratches is further subjected to anodic oxidation and polishing, it is difficult to obtain a high-gloss surface.
- After the degreasing step (S200), in order to remove fine grinding pad marks or scratches from the surface of the aluminum or aluminum alloy, the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes immersing the aluminum or aluminum alloy in an etching solution having a predetermined composition, and thereby the fine grinding pad marks or scratches existing on the surface of the aluminum or aluminum alloy may be removed by etching, and simultaneously, a transparent glossy film as illustrated in
FIG. 2(b) is formed (S300). - According to the present invention, the etching solution is prepared by heat-dissolving 45 ∼ 475 g of acidic ammonium fluoride in a mixed solution resulting from mixing 1 L of water and 1 ∼ 9% of boric acid based on the total weight thereof.
- The acidic ammonium fluoride may be any one selected from among NH4F, NH4HF and NH4HF2, and the boric acid is preferably ortho-boric acid that is represented by H3BO3 and is colorless, transparent or lustrous.
- The reason why the etching solution comprising acidic ammonium fluoride and boric acid as above is used is as follows: when using a conventional etching solution comprising an acidic ammonium fluoride aqueous solution or a mixed aqueous solution of acidic ammonium fluoride and calcium gluconate or hydrofluoric acid, it is possible to obtain the surface of aluminum or an aluminum alloy without fine grinding pad marks or scratches.
- However, when the surface of the aluminum or aluminum alloy is etched using such a conventional etching solution, it may become opaque and dull, thereby making it difficult to obtain a high-gloss surface of the aluminum or aluminum alloy. Hence, the etching solution comprising acidic ammonium fluoride and boric acid is useful.
- Furthermore, forming the transparent glossy film (S300) may be performed under various temperature and time conditions.
- According to the present invention, forming the transparent glossy film (S300) is conducted by immersing the aluminum or aluminum alloy in the etching solution at room temperature (about 25°C) for 1 ~ 10 min.
- Also, the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes subjecting the aluminum or aluminum alloy having the transparent glossy film to anodic oxidation, thus forming an oxide film at a predetermined thickness on the surface of the aluminum or aluminum alloy (S400).
- Forming the oxide film (S400) may be implemented using an electrolytic solution comprising any one or a mixture of two or more selected from among sulfuric acid, oxalic acid and chromic acid.
- In a preferred embodiment of the present invention, sulfuric acid (H2SO4) is used for the electrolytic solution to enhance profitability, transparency of the oxide film, corrosion resistance, and wear resistance. The aluminum alloy is immersed in the sulfuric acid electrolytic solution at 20°C and a voltage of 14 V is then applied for 50 min, thus forming a 20 ∼ 22 µm thick oxide film.
- After the step (S400) of forming the oxide film, the method of surface-treating the aluminum alloy according to the embodiment of the present invention includes post-treating the aluminum or aluminum alloy.
- As such, post-treatment may include coloring and polishing the surface of the aluminum alloy having the oxide film (S500) and sealing the colored and polished aluminum alloy (S600).
- The aluminum or aluminum alloy may be variously colored via the coloring and polishing (S500), and the polishing process may be performed using any mechanical means, but the present invention is not limited thereto.
- After the step (S500) of coloring and polishing, the method of surface-treating the aluminum alloy according to the embodiment of the present invention may include sealing the aluminum or aluminum alloy (S600).
- The sealing step (S600) indicates a process of sealing micropores of the oxide film formed by anodic oxidation to thus modify the properties including corrosion resistance, etc.
- The sealing step (S600) according to the embodiment of the present invention may be conducted using various sealing processes such as sealing by hydration, metal salt sealing and organic compound sealing.
- In a preferred embodiment of the present invention, the sealing step (S600) is performed via metal salt sealing by immersing the aluminum or aluminum alloy having the oxide film in a metal salt aqueous solution.
- As such, nickel is used for the metal salt, and the aluminum or aluminum alloy is immersed in a nickel salt aqueous solution at 60 ∼ 80°C for 10 min, thus ensuring a high-gloss surface of the aluminum or aluminum alloy.
- According to the embodiment or the preferred embodiment of the present invention, the method of surface-treating the aluminum alloy enables scratches and grinding pad marks generated on the surface of the aluminum or aluminum alloy by mechanical grinding to be effectively removed via the aforementioned steps.
- Regardless of the anodic oxidation time, a high-gloss surface of the aluminum alloy may be obtained.
- The preferred embodiment of the present invention has been disclosed for illustrative purposes, while those skilled in the art will appreciate that various modifications, additions and substitutions are possible.
- Below is a detailed description of an embodiment of the present invention in conjunction with
FIGS. 1 and2 . - Referring to
FIGS. 1 and2 , a method of surface-treating an aluminum alloy according to an embodiment of the present invention includes pretreating aluminum or an aluminum alloy prepared by extrusion or rolling. - As such, the pretreating process includes grinding the surface of the prepared aluminum alloy (S100) and immersing the ground aluminum alloy in a degreasing solution having a predetermined composition to remove impurities remaining on the surface of the aluminum alloy by degreasing (S200).
- These pretreatment steps (S100 and S200) are described in detail below.
- Specifically, grinding the surface of the aluminum alloy (S100) is a step (S100) of mechanically grinding the prepared aluminum or aluminum alloy using a variety of grinding agents including oil or fat grinding agents.
- After the step (S100) of grinding the surface of the aluminum alloy, impurities or grinding agent may be left behind on the surface of the aluminum or aluminum alloy due to the mechanical grinding. There is a need to remove these remaining impurities.
- With the goal of removing the impurities or remaining grinding agent, immersing the ground aluminum or aluminum alloy in a degreasing solution having a predetermined composition is performed, so that the surface of the aluminum or aluminum alloy is degreased to remove the impurities or remaining grinding agent therefrom (S200).
- As such, removal of the impurities or remaining grinding agent by degreasing (S200) may be carried out by removing the impurities or remaining grinding agent from the surface of the aluminum or aluminum alloy using a degreasing solution including a nonionic surfactant and sulfuric acid (H2SO4).
- In the present invention, the degreasing solution may be prepared by mixing 1 L of water with 6.5% of alkylamine ethoxylate or alcohol ethoxylate and 6.5% of sulfuric acid on the total weight thereof.
- The aluminum or aluminum alloy is immersed in the degreasing solution at 55°C for 6 min, thus removing the impurities or remaining grinding agent.
- Also, removing the impurities or remaining grinding agent by degreasing (S200) may be effectively implemented by applying ultrasonic waves or vibration to the aluminum or aluminum alloy, which is immersed in the degreasing solution, or by shaking the degreasing solution.
- Meanwhile, the aluminum or aluminum alloy prepared by rolling or extrusion has a rough surface due to the nature of the corresponding process. As such, the removal of such a rough surface by the mechanical grinding step (S100) and the degreasing step (S200) is limited.
- Specifically, the rough surface may be removed to some extent by the mechanical grinding step (S100) and the degreasing step (S200). As illustrated in
FIG. 2(a) , however, fine grinding pad marks or scratches may be present after the degreasing step (S200). - Even when the surface of the aluminum or aluminum alloy including such fine grinding pad marks or scratches is further subjected to anodic oxidation and polishing, it is difficult to obtain a high-gloss surface.
- After the degreasing step (S200), therefore, immersing the aluminum or aluminum alloy in an etching solution having a predetermined composition to remove fine grinding pad marks or scratches from the surface of the aluminum or aluminum alloy is performed, so that the fine grinding pad marks or scratches existing on the surface of the aluminum or aluminum alloy are removed by etching, and simultaneously, a transparent glossy film as illustrated in
FIG. 2(b) is formed (S300). - According to the embodiment of the present invention, the etching solution may be prepared by heat-dissolving 260 g of acidic ammonium fluoride in a mixed solution resulting from mixing 1 L of water and 5% of boric acid based on the total weight thereof.
- The acidic ammonium fluoride may include NH4F, and the boric acid may be ortho-boric acid that is represented by H3BO3 and is colorless, transparent or lustrous.
- The reason why the etching solution comprising acidic ammonium fluoride and boric acid as above is used is as follows: when using a conventional etching solution comprising an acidic ammonium fluoride aqueous solution or a mixed aqueous solution of acidic ammonium fluoride and calcium gluconate or hydrofluoric acid, it is possible to obtain the surface of aluminum or an aluminum alloy without fine grinding pad marks or scratches.
- However, when the surface of the aluminum or aluminum alloy is etched using such a conventional etching solution, it may become opaque and dull, making it difficult to afford a high-gloss surface of the aluminum or aluminum alloy. Hence, the etching solution comprising acidic ammonium fluoride and boric acid is useful.
- Furthermore, forming the transparent glossy film (S300) may be performed by immersing the aluminum or aluminum alloy in the etching solution at room temperature (25°C) for 5 min.
- Then, subjecting the aluminum or aluminum alloy having the transparent glossy film to anodic oxidation to form an oxide film at a predetermined thickness on the surface of the aluminum or aluminum alloy (S400) is performed.
- As such, forming the oxide film (S400) may be carried out using an electrolytic solution comprising sulfuric acid.
- The aluminum alloy is immersed in the sulfuric acid electrolytic solution at 20°C, followed by applying a voltage of 14 V for 50 min, thus forming a 20 µm thick oxide film.
- After the step (S400) of forming the oxide film, post-treating the aluminum or aluminum alloy is conducted.
- As such, post-treatment may include coloring and polishing the surface of the aluminum alloy having the oxide film (S500) and sealing the colored and polished aluminum alloy (S600).
- After the step (S500) of coloring and polishing, sealing the aluminum or aluminum alloy (S600) is carried out.
- The sealing step (S600) is conducted via metal salt sealing in such a manner that the aluminum or aluminum alloy having the oxide film is immersed in a metal salt aqueous solution.
- As such, nickel is used for the metal salt, and the aluminum or aluminum alloy is immersed in a nickel salt aqueous solution at 70°C for 10 min, thereby ensuring a high-gloss surface of the aluminum or aluminum alloy.
- Consequently, the aforementioned steps of the method of surface-treating the aluminum alloy according to the present invention are effective at removing scratches and grinding pad marks generated on the surface of the aluminum or aluminum alloy by mechanical grinding.
- Moreover, the aluminum alloy may have a high-gloss surface, regardless of the anodic oxidation time.
- According to the present invention, a method of surface-treating an aluminum alloy can effectively remove scratches and grinding pad marks generated by mechanical grinding.
- Also, regardless of anodic oxidation time, an aluminum alloy having high gloss can be manufactured, and thus the present invention is industrially applicable.
Claims (5)
- A method of surface-treating an aluminum alloy, comprising:pretreating an aluminum alloy;immersing the pretreated aluminum alloy in an etching solution having a predetermined composition so that a surface of the aluminum alloy is etched, thus forming a transparent glossy film;subjecting the aluminum alloy having the transparent glossy film to anodic oxidation, thus forming an oxide film on the surface of the aluminum alloy; andpost-treating the aluminum alloy having the oxide film;characterised in thatthe etching solution is prepared by heat-dissolving 45 ∼ 475 g of acidic ammonium fluoride in a mixed solution resulting from mixing 1 L of water and 1 ∼ 9% of boric acid based on a total weight thereof, and the aluminum alloy is etched by being immersed in the etching solution at room temperature for 1 ∼ 10 min.
- The method of claim 1, wherein pretreating the aluminum alloy comprises:grinding the surface of the aluminum alloy; andimmersing the ground aluminum alloy in a degreasing solution having a predetermined composition to remove impurities from the surface of the aluminum alloy.
- The method of claim 2, wherein the degreasing solution is prepared by mixing 1 L of water and 3 ∼ 10% of alkylamine ethoxylate or alcohol ethoxylate and 3 ∼ 10% of sulfuric acid based on a total weight thereof, and the aluminum alloy is degreased by being immersed in the degreasing solution at 50 ∼ 60°C for 3 ∼ 10 min.
- The method of one of claims 1 to 3, wherein forming the oxide film is performed by immersing the aluminum alloy in a sulfuric acid electrolytic solution at 20°C and then applying a voltage of 14 V for 50 min to form the oxide film having a thickness of 20 ∼ 22 µm.
- The method of one of claims 1 to 4, wherein post-treating the aluminum alloy having the oxide film comprises:coloring and polishing the surface of the aluminum alloy having the oxide film; andsealing the colored and polished aluminum alloy.
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KR102094067B1 (en) * | 2017-07-17 | 2020-03-26 | 오제민 | Method for lusterless aluminum |
CN109183053B (en) * | 2018-09-18 | 2021-01-01 | 山东龙口三元铝材有限公司 | Flexible treatment liquid and method for treating pull ring material by using same |
KR20210069469A (en) | 2019-12-03 | 2021-06-11 | 삼성전자주식회사 | Surface pattern forming method for aluminium product |
CN111088503A (en) * | 2019-12-31 | 2020-05-01 | 中山市皓祥模具五金有限公司 | Surface treatment process for aluminum product |
CN113235097A (en) * | 2021-05-13 | 2021-08-10 | 唐山盛斯拓金属制品有限公司 | Coloring process for bicycle milled-arc rim |
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US8349462B2 (en) * | 2009-01-16 | 2013-01-08 | Alcoa Inc. | Aluminum alloys, aluminum alloy products and methods for making the same |
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