CN111206275A - Strong acid and strong basicity resistant hole sealing treatment method for aluminum alloy anodic oxide film - Google Patents
Strong acid and strong basicity resistant hole sealing treatment method for aluminum alloy anodic oxide film Download PDFInfo
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- CN111206275A CN111206275A CN202010097307.3A CN202010097307A CN111206275A CN 111206275 A CN111206275 A CN 111206275A CN 202010097307 A CN202010097307 A CN 202010097307A CN 111206275 A CN111206275 A CN 111206275A
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- 238000007789 sealing Methods 0.000 title claims abstract description 95
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 64
- 239000002253 acid Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000010407 anodic oxide Substances 0.000 title claims description 18
- 239000003973 paint Substances 0.000 claims abstract description 39
- 238000001962 electrophoresis Methods 0.000 claims abstract description 25
- -1 polysiloxane Polymers 0.000 claims abstract description 19
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 16
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 229920002635 polyurethane Polymers 0.000 claims abstract description 13
- 239000004814 polyurethane Substances 0.000 claims abstract description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 8
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 238000004040 coloring Methods 0.000 claims description 6
- 238000007743 anodising Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 239000013527 degreasing agent Substances 0.000 claims description 3
- 238000005237 degreasing agent Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 229940078494 nickel acetate Drugs 0.000 claims description 3
- DBJLJFTWODWSOF-UHFFFAOYSA-L nickel(ii) fluoride Chemical compound F[Ni]F DBJLJFTWODWSOF-UHFFFAOYSA-L 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- RCIVOBGSMSSVTR-UHFFFAOYSA-L stannous sulfate Chemical compound [SnH2+2].[O-]S([O-])(=O)=O RCIVOBGSMSSVTR-UHFFFAOYSA-L 0.000 claims description 3
- 229910000375 tin(II) sulfate Inorganic materials 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract description 2
- 229910000077 silane Inorganic materials 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 description 9
- 239000002585 base Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000011056 performance test Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 3
- 240000007594 Oryza sativa Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- AIYYMMQIMJOTBM-UHFFFAOYSA-L nickel(ii) acetate Chemical compound [Ni+2].CC([O-])=O.CC([O-])=O AIYYMMQIMJOTBM-UHFFFAOYSA-L 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000553 6063 aluminium alloy Inorganic materials 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002659 electrodeposit Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
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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
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/20—Electrolytic after-treatment
- C25D11/22—Electrolytic after-treatment for colouring layers
-
- 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
- C25D11/16—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
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/04—Electrophoretic coating characterised by the process with organic material
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/18—Polishing of light metals
- C25F3/20—Polishing of light metals of aluminium
Abstract
The invention provides a strong acid and strong base hole sealing treatment method for an aluminum alloy anode oxide film, which is used for sequentially carrying out three steps of hole sealing treatment on an aluminum alloy workpiece subjected to anodic oxidation treatment, wherein the hole sealing treatment in the first step is carried out by adopting cold sealing or medium temperature hole sealing treatment, the hole sealing treatment in the second step is carried out by adopting polysiloxane gel-dissolving paint, and the hole sealing treatment in the third step is carried out by adopting acrylic acid or polyurethane acrylate interpenetrating network polymerization type electrophoretic paint for carrying out anodic electrophoresis treatment. After three-step hole sealing treatment, a composite film layer consisting of a hole sealing layer, a silane coating and an electrophoresis layer three-layer film is obtained, and the composite film layer obtained by the method has excellent strong acid and strong base corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of anodic oxidation surface treatment of aluminum alloy parts for automobiles, and relates to a hole sealing treatment method capable of improving strong acid and strong base resistance of an aluminum alloy anodic oxide film.
Background
Along with the development of light weight of automobiles, aluminum alloy is more and more widely applied to automobile parts, such as automobile external decorative parts, aluminum alloy luggage racks and water cut bright stripes. In the process of cleaning the automobile, a strong acid or strong alkali type cleaning solution is usually adopted, and the strong acid or strong alkali type cleaning solution is easy to corrode a luggage rack and a water-cut bright strip, so that the surface of the luggage rack is whitened to influence the appearance. Therefore, each car and rabbet increases the requirements of strong acid resistance (pH1) and strong base resistance (pH13.5) in the aluminum or aluminum alloy anode oxidation standard, and only a few sealing processes in the prior art can meet the requirements of strong acid resistance and strong base resistance. For example, patent CN103469276A proposes that after the anodic oxide film is sequentially subjected to three-step sealing treatment of ODM SEAL R-15 cold sealing, ODM SEAL ARS-22 cold sealing and ODM SEAL ARS-40 heat sealing, the anodic oxide film has high acid resistance and alkali resistance. Patent CN106119924A proposes to carry out three-step hole sealing treatment on an anodized aluminum and aluminum alloy workpiece, wherein the hole sealing in the first step adopts cold sealing, hot water sealing, organic acid hole sealing or rare earth metal salt hole sealing, the hole sealing in the second step adopts passivation or vitrification, the hole sealing in the third step adopts middle-high temperature hole sealing or hot water hole sealing, and a treated oxide film has acid resistance and alkali resistance; patent CN103469277A proposes to electrodeposit a layer of mixed acrylic resin and amino acid resin in an anodic oxide film layer, which has good acid and alkali resistance. According to the hole sealing method provided by patents CN103469276A and CN106119924A, the salt spray and condensed water test stability is poor, which is not beneficial to industrial production; the film layer treated by the patent CN103469277A is stable in salt fog and condensed water tests, but the problem of 'white watermark' occurs in the dripping test. The three-step hole sealing treatment method of the invention is to sequentially carry out cold hole sealing treatment or medium temperature hole sealing treatment and polysiloxane sol treatment on the workpiece after anodic oxidation, and finally carry out anodic electrophoresis treatment to obtain the composite film layer consisting of the hole sealing layer, the silane layer and the electrophoresis layer.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a strong acid and strong alkaline resistant hole sealing treatment method for an aluminum alloy anode oxide film.
The invention aims to realize the following technical scheme that the strong acid and strong alkali resistant hole sealing treatment method for the aluminum alloy anodic oxide film is characterized in that after sulfuric acid anodic oxidation is carried out on the aluminum alloy, cold hole sealing of nickel fluoride salt or medium temperature hole sealing of nickel acetate salt, polysiloxane sol treatment and anodic electrophoresis treatment are sequentially carried out. The composite film layer formed by the three layers of the hole sealing layer, the sol coating and the electrophoresis layer is obtained, has excellent strong acid and alkali resistance, and meets various performance test standards of the aluminum alloy anodic oxidation parts of the vehicle and the enterprise. The method comprises the following specific steps:
(1) degreasing: immersing an aluminum alloy workpiece into 40g/L alkalescent degreasing agent, and treating for 10min at the temperature of 50 ℃;
(2) electrolytic polishing: immersing the degreased aluminum alloy workpiece into a mixed solution of 700-800g/L phosphoric acid and 300-350g/L sulfuric acid for electrolytic polishing for 20 min;
(3) removing the film: immersing the aluminum alloy workpiece subjected to electrolytic polishing in a 30g/L sodium hydroxide solution for treatment for 1 min;
(4) ash removal: immersing the aluminum alloy workpiece after the membrane is removed into a 180g/L sulfuric acid solution for treatment for 1 min;
(5) anodic oxidation: immersing the aluminum alloy workpiece subjected to ash removal into a 180g/L sulfuric acid solution, and anodizing for 25min under the conditions that the voltage is 15V and the temperature is 18 ℃;
(6) electrolytic coloring: immersing the aluminum alloy workpiece subjected to anodic oxidation treatment in coloring liquid containing 16g/L of stannous sulfate, 30g/L of stabilizer and 25g/L of sulfuric acid at the temperature of 20-22 ℃ and the voltage of 14V for 1-12 min;
(7) cold sealing or medium temperature sealing:
cold sealing, soaking the anodized or electrolytically colored aluminum alloy workpiece in 5g/L sealant K14-P (product of Metachem company, Germany) at 25-30 deg.C and pH6.0 for 5-10 min;
hole sealing at medium temperature: immersing the anodized aluminum alloy workpiece into 10g/L of a hole sealing agent DX-500 (a product of Japan Oryza Glutinosa), and treating at 80-90 deg.C and pH of 5.5-6.0 for 5-10 min;
(8) treating the aluminum alloy workpiece subjected to hole sealing treatment with polysiloxane sol-gel paint, wherein the thickness of the coating is 1-5 μm, the curing temperature is 150-;
(9) immersing the aluminum alloy workpiece treated by the polysiloxane sol-gel paint into hot pure water, and treating for 10min under the conditions that the temperature is 70-80 ℃ and the pH is 6-7;
(10) and (3) carrying out anodic electrophoresis treatment on the aluminum alloy workpiece subjected to hot water washing, and treating for 2-10min at the voltage of 200-250V by using acrylic or polyurethane acrylate interpenetrating network polymerization electrophoretic paint. Wherein the acrylic acid electrophoretic paint is FREOTHERM-ATL-Clear electrophoretic paint produced by FreiLacke Germany; the polyurethane electrophoretic paint is LECTRASEAL242B193 electrophoretic paint produced by Clearclad company in UK; the polyurethane acrylate interpenetrating network polymerization electrophoretic paint is Alpro P/A IPN Type-100 electrophoretic paint produced by Alpro company in China.
The invention has the beneficial effects that: the aluminum alloy anodic oxidation workpiece is subjected to three-step sealing treatment, namely, cold sealing or medium temperature sealing is adopted in the first step, polysiloxane sol paint is adopted in the second step, and anodic electrophoresis is adopted in the third step, so that a composite film layer consisting of a sealing layer, a sol coating and an electrophoresis layer is obtained. The composite film layer has excellent strong acid and strong alkali corrosion resistance and passes the performance test standard of the car rabbet aluminum alloy anodic oxidation part.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the structure of a composite film layer after being processed by the processing method of the present invention;
Detailed Description
The following examples are intended to further illustrate the present disclosure and will aid in the understanding of the present invention, but the present invention is not limited to only the following examples.
A strong acid and strong base resistant hole sealing treatment method for an aluminum alloy anodic oxide film is characterized in that after an aluminum alloy workpiece is subjected to sulfuric acid anodic oxidation treatment, nickel fluoride salt cold hole sealing or nickel acetate salt medium temperature hole sealing, polysiloxane sol paint treatment and anodic electrophoresis treatment are sequentially carried out, the obtained composite film layer has excellent strong acid and strong base corrosion resistance, and passes the anodic oxidation performance test standard of various vehicle and enterprise aluminum alloy parts. The method comprises the following specific steps:
the aluminum alloy material adopted in the embodiment is 6063 aluminum alloy.
(1) Degreasing: immersing an aluminum alloy workpiece into 40g/L alkalescent degreasing agent, and treating for 10min at the temperature of 50 ℃;
(2) electrolytic polishing: immersing the degreased aluminum alloy workpiece into a mixed solution of 700-800g/L phosphoric acid and 300-350g/L sulfuric acid for electrolytic polishing for 20 min;
(3) removing the film: immersing the aluminum alloy workpiece subjected to electrolytic polishing in a 30g/L sodium hydroxide solution for treatment for 1 min;
(4) ash removal: immersing the aluminum alloy workpiece after the membrane is removed into a 180g/L sulfuric acid solution for treatment for 1 min;
(5) anodic oxidation: immersing the aluminum alloy workpiece subjected to ash removal into a 180g/L sulfuric acid solution, and anodizing for 25min under the conditions that the voltage is 15V and the temperature is 18 ℃;
(6) electrolytic coloring: immersing the aluminum alloy workpiece subjected to anodic oxidation treatment in coloring liquid containing 16g/L of stannous sulfate, 30g/L of stabilizer and 25g/L of sulfuric acid at the temperature of 20-22 ℃ and the voltage of 14V for 10 min;
(7) cold sealing or medium temperature sealing:
cold sealing, soaking the anodized or electrolytically colored aluminum alloy workpiece in 5g/L sealant K14-P (product of Metachem company, Germany) at 25-30 deg.C and pH6.0 for 5-10 min;
hole sealing at medium temperature: immersing the anodized aluminum alloy workpiece into 10g/L of a hole sealing agent DX-500 (a product of Japan Oryza Glutinosa), and treating at 80-90 deg.C and pH of 5.5-6.0 for 5-10 min;
(8) treating the aluminum alloy workpiece subjected to hole sealing treatment with polysiloxane sol-gel paint, wherein the thickness of the coating is 1-5 μm, the curing temperature is 150-;
(9) immersing the aluminum alloy workpiece treated by the polysiloxane sol-gel paint into hot pure water, and treating for 10min under the conditions that the temperature is 70-80 ℃ and the pH is 6-7;
(10) and (3) carrying out anodic electrophoresis treatment on the aluminum alloy workpiece subjected to hot water washing, and treating for 2-10min at the voltage of 200-250V by using acrylic or polyurethane acrylate interpenetrating network polymerization electrophoretic paint.
In the invention, an aluminum alloy workpiece is oxidized for 25min at 18 ℃ and 15V in 180g/L sulfuric acid solution to obtain an oxidized film with the thickness of about 6-8 mu m, and the anodized aluminum alloy workpiece is subjected to sealing treatment in the following examples. Performance testing was performed according to the method provided in table 1.
The results in table 2 show that after the aluminum alloy anodized workpiece is subjected to the three-step hole sealing treatment provided herein, the composite film layer passes various performance tests of strong acid, strong base (pH1+ pH13.5), neutral salt spray and the like. The composite film layer has excellent strong acid and strong alkali corrosion resistance, and meets the anodic oxidation performance requirement of aluminum alloy parts of automobile enterprises.
Example 1
The first step of cold hole sealing treatment: the hole sealing agent K14-P (concentration 5g/L, temperature 28 ℃, pH6.0, time 5min)
The second step of polysiloxane sol-gel paint treatment (coating thickness 2 μm, curing at 180 ℃ for 5min)
The third step is acrylic acid anode electrophoresis treatment: FREOTHERM-ATL-Clear (voltage 200V, electrophoresis time 2min, film thickness 3-5 μm, temperature 200 deg.C, curing 30min)
Example 2
The first step of cold hole sealing treatment: the hole sealing agent K14-P (concentration 5g/L, temperature 28 ℃, pH6.0, time 10min)
The second step of polysiloxane sol-gel paint treatment (coating thickness 5 μm200 deg.C, curing for 5min)
Thirdly, performing anodic electrophoresis treatment on the polyurethane electrophoretic paint: LECTRASEAL electrophoretic paint (voltage 220V, electrophoresis time 4min, film thickness 6-8 μm, temperature 160 deg.C, curing 40min)
Example 3
The first step of nickel acetate medium temperature sealing treatment: blocking agent DX-500 (concentration 10g/L, temperature 85 deg.C, pH6.0, time 5min), second step polysiloxane sol paint treatment (coating thickness 2 μm180 deg.C, curing 5min)
The third step is acrylic acid anode electrophoresis treatment: FREOTHERM-ATL-Clear (voltage 200V, electrophoresis time 2min, film thickness 3-5 μm, temperature 200 deg.C, curing 30min)
Example 4
The first step of nickel acetate medium temperature sealing treatment: blocking agent DX-500 (concentration 10g/L, temperature 80 deg.C, pH6.0, time 10min), second polysiloxane sol paint treatment (coating thickness 5 μm, curing at 200 deg.C for 5min)
Thirdly, performing anodic electrophoresis treatment on the polyurethane electrophoretic paint: LECTRASEAL electrophoretic paint (voltage 220V, electrophoresis time 4min, film thickness 6-8 μm, temperature 160 deg.C, curing 40min)
Example 5
The first step of cold hole sealing treatment: the hole sealing agent K14-P (concentration 5g/L, temperature 28 ℃, pH6.0, time 5min)
The second step of polysiloxane sol-gel paint treatment (coating thickness 2 μm, curing at 180 ℃ for 5min)
Thirdly, polyurethane acrylate interpenetrating network polymerization type anode electrophoresis treatment: alpro P/A IPN Type-100 (voltage 210V, electrophoresis time 3min, film thickness 3-5 μm, temperature 200 ℃, curing 30min)
TABLE 1 test methods
TABLE 2 test results
Claims (10)
1. A strong acid and strong basicity resistant hole sealing treatment method for an aluminum alloy anodic oxide film is characterized by comprising the following steps: and sequentially carrying out three-step hole sealing treatment on the aluminum alloy workpiece subjected to the anodic oxidation treatment, wherein the hole sealing in the first step adopts a cold hole sealing or medium-temperature hole sealing treatment, the hole sealing in the second step adopts a polysiloxane sol-gel coating treatment, and the hole sealing in the third step adopts anodic electrophoresis treatment.
2. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 1, wherein: the cold sealing is performed by sealing agent which takes nickel fluoride as main component.
3. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 2, wherein: the temperature of the cold sealing hole is 25-30 ℃, and the treatment time is 5-10 min.
4. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 1, wherein: the medium-temperature hole sealing is performed by hole sealing agent which takes nickel acetate as main component.
5. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 4, wherein: the temperature of the medium-temperature hole sealing is 80-90 ℃, and the treatment time is 5-10 min.
6. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 1, wherein: the sol-gel paint treatment is coating treatment with polysiloxane as a main component, and the coating is a transparent coating.
7. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 6, wherein: the thickness of the coating layer treated by the polysiloxane sol-gel paint is 1-5 mu m, the curing temperature is 150 ℃ and 200 ℃, and the time is 2-10 min.
8. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 1, wherein: the electrophoresis treatment is anodic electrophoresis, acrylic acid or polyurethane acrylate interpenetrating network polymerization type electrophoretic paint is selected, and a paint film is a transparent coating.
9. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 8, wherein: the thickness of the electrophoretic paint film is 2-10 μm, the curing temperature is 160-200 ℃, and the curing time is 30-40 min.
10. The method for strong acid and strong base resistant hole sealing treatment of an aluminum alloy anodic oxide film according to claim 1, wherein: comprises the following main steps:
① degreasing, treating the workpiece with 40g/L alkalescent degreasing agent at 50 deg.C for 10 min;
② electrolytic polishing, namely immersing the degreased aluminum alloy workpiece into a mixed solution of sulfuric acid and phosphoric acid for electrolytic polishing for 15-25 min;
③, removing the film, namely immersing the aluminum alloy workpiece after electrolytic polishing into a 30g/L sodium hydroxide solution for treatment for 1 min;
④, dedusting, namely immersing the aluminum alloy workpiece after film removal into a 180g/L sulfuric acid solution for treatment for 1 min;
⑤ anodizing, namely immersing the pretreated aluminum alloy workpiece into an anodizing tank with the concentration of free sulfuric acid of 180g/L, anodizing for 25min at the voltage of 15V and the temperature of 18-20 ℃, and then taking out and cleaning;
⑥ electrolytic coloring, which comprises immersing the anodized aluminum alloy workpiece in coloring solution containing stannous sulfate 16g/L, stabilizer 30g/L, and sulfuric acid 25g/L at 20-22 deg.C and 14V for 1-12 min;
sequentially carrying out three-step hole sealing treatment on the anodized or electrolytically colored aluminum alloy workpiece:
step one, cold hole sealing or medium temperature hole sealing treatment: wherein the cold sealing hole adopts a hole sealing agent K14-P, 5g/L, pH6.0, temperature 25-30 deg.C, time 5-10 min;
the medium temperature hole sealing adopts hole sealing agent DX-500, 10g/L, pH5.5-6.0, temperature 80-90 deg.C, time 5-10 min;
step two, treating polysiloxane sol-gel paint, wherein the thickness of the coating is 1-5 mu m, the curing temperature is 150-;
and (3) carrying out hot pure water washing on the aluminum alloy workpiece treated by the sol paint: the temperature is 70-80 deg.C, pH is 6-7, and the time is 10 min;
thirdly, electrophoresis treatment: adopting acrylic acid, polyurethane or polyurethane acrylate interpenetrating network polymerization type anode electrophoretic paint, wherein the voltage is 200-250V, the time is 2-10min, the curing temperature is 160-200 ℃, and the curing time is 30-40 min;
wherein the acrylic acid electrophoretic paint is FREOTHERM-ATL-Clear electrophoretic paint; the polyurethane electrophoretic paint is LECTRASEAL242B193 electrophoretic paint; the polyurethane acrylate interpenetrating network polymerization electrophoretic paint is Alpro P/A IPN Type-100 electrophoretic paint.
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| CN202010097307.3A CN111206275B (en) | 2020-02-17 | 2020-02-17 | Strong acid and strong basicity resistant hole sealing treatment method for aluminum alloy anodic oxide film |
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| CN202010097307.3A CN111206275B (en) | 2020-02-17 | 2020-02-17 | Strong acid and strong basicity resistant hole sealing treatment method for aluminum alloy anodic oxide film |
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| CN112760692A (en) * | 2020-12-26 | 2021-05-07 | 佛山市三水凤铝铝业有限公司 | Aluminum alloy anodic oxidation sealing liquid and sealing method thereof |
| CN113355714A (en) * | 2021-06-22 | 2021-09-07 | 秦皇岛威卡威汽车零部件有限公司 | Method for anodizing and sealing and glazing oxide film of aluminum or aluminum alloy part |
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