CN111020665B - Pretreatment process for spraying ceramic non-stick coating on aluminum alloy cooker - Google Patents
Pretreatment process for spraying ceramic non-stick coating on aluminum alloy cooker Download PDFInfo
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- CN111020665B CN111020665B CN201911300234.7A CN201911300234A CN111020665B CN 111020665 B CN111020665 B CN 111020665B CN 201911300234 A CN201911300234 A CN 201911300234A CN 111020665 B CN111020665 B CN 111020665B
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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
- C25D11/06—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
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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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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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
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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
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Abstract
The invention discloses a pretreatment process for spraying a ceramic non-stick coating on an aluminum alloy cooker, which comprises the steps of oil removal, acid neutralization, anodic oxidation, sealing and water washing, wherein a full-pulse direct-current power supply is adopted for anodic oxidation, and meanwhile, sulfuric acid and oxalic acid are contained in electrolyte, so that a larger current density can be realized, the anodic oxidation time is greatly reduced, the energy consumption is reduced, the cost is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of aluminum surface treatment, in particular to a pretreatment process for spraying a ceramic non-stick coating on an aluminum alloy cooker.
Background
At present, a novel ceramic coating is used as a non-stick coating for spraying aluminum cookers, but the surface wear resistance and corrosion resistance of the aluminum cookers cannot meet the requirements, so the aluminum alloy cookers are generally pretreated before the ceramic coating is sprayed for improving the wear resistance and corrosion resistance of the aluminum cookers. The prior pretreatment usually needs to form a conversion film on the surface of an aluminum alloy cooker, however, the traditional conversion film preparation process adopts a direct current power supply as a power supply and pure sulfuric acid as electrolyte for anodic oxidation, and has the disadvantages of high energy consumption, long time consumption and low production efficiency.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a pretreatment process for spraying a ceramic non-stick coating on an aluminum alloy cooker, which has the advantages of low energy consumption, short time consumption and high production efficiency.
The pretreatment process for spraying the ceramic non-stick coating on the aluminum alloy cooker comprises the following steps: degreasing, namely putting the cooker into a degreasing agent, cleaning the surface of the cooker through the degreasing agent, and removing oil stains on the surface of the cooker; acid neutralization, namely putting the cooker into phosphoric acid, neutralizing the residual oil removal agent on the cooker by the phosphoric acid, and then washing the cooker clean; anodizing, namely connecting the cooker with an anode of a full-pulse direct-current power supply, and then putting the cooker into electrolyte for anodizing, wherein the electrolyte contains sulfuric acid and oxalic acid; sealing, namely putting the cooker after anodic oxidation into a sealing agent for sealing treatment; and (4) washing, namely washing the closed cooker by clear water and airing.
The pretreatment process for spraying the ceramic non-stick coating on the aluminum alloy cooker according to the embodiment of the invention at least has the following beneficial effects: the pretreatment process for spraying the ceramic non-stick coating on the aluminum alloy cooker adopts a full-pulse direct-current power supply to carry out anodic oxidation, and meanwhile, the electrolyte contains sulfuric acid and oxalic acid, so that the process can realize larger current density, greatly reduce the time of anodic oxidation, reduce energy consumption, reduce cost and improve production efficiency.
According to some embodiments of the invention, the electrolyte formulation is: 100-160 g/L sulfuric acid, 7-15 g/L oxalic acid and 0.1-10 g/L aluminum ions.
According to some embodiments of the invention, the temperature of the electrolyte is 0 to 6 ℃.
According to some embodiments of the present invention, the anodic oxidation time is 180 to 600 seconds and the current density is 3 to 5A/dm 2.
According to some embodiments of the present invention, the full-pulse DC power supply has a positive pulse current density A + of 3-5A/dm 2, a positive pulse current time t + of 30-60 seconds, a negative pulse current density A-of 3-5A/dm 2, a negative pulse current time t-of 5-10 seconds, and a termination voltage of 30-40V.
According to some embodiments of the invention, the temperature of the oil removing agent is 45-55 ℃, and the oil removing reaction time is 20-60 seconds.
According to some embodiments of the invention, the phosphoric acid temperature is 40-60 ℃ and the neutralization reaction time is 5-20 seconds.
According to some embodiments of the invention, the temperature of the sealant is 15-35 ℃ and the sealing treatment time is 100-200 seconds.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a waveform diagram of a full-pulse DC power supply of the pretreatment process of spraying a ceramic non-stick coating on an aluminum alloy cooker according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The invention discloses a pretreatment process for spraying a ceramic non-stick coating on an aluminum alloy cooker, which comprises the following steps of: degreasing, namely putting the cooker into a degreasing agent, cleaning the surface of the cooker through the degreasing agent, and degreasing the surface of the cooker, wherein the temperature of the degreasing agent is 45-55 ℃, and the degreasing reaction time is 20-60 seconds; acid neutralization, namely, putting the cooker into phosphoric acid, neutralizing the residual oil removal agent on the cooker by the phosphoric acid, wherein the temperature of the phosphoric acid is 40-60 ℃, the neutralization reaction time is 5-20 seconds, and then washing the cooker clean; anodizing, namely connecting the cooker with an anode of a full-pulse direct-current power supply, and then placing the cooker into an electrolyte for anodizing, wherein the anodizing time is 180-600 seconds, the current density is 3-5A/dm 2, as shown in FIG. 1, the positive pulse current density A + of the full-pulse direct-current power supply is 3-5A/dm 2, the positive pulse current time t + is 30-60 seconds, the negative pulse current density A-is 3-5A/dm 2, the negative pulse current time t-is 5-10 seconds, the termination voltage is 30-40V, and the electrolyte formula is as follows: 100-160 g/L of sulfuric acid, 7-15 g/L of oxalic acid, 0.1-10 g/L of aluminum ions and 0-6 ℃ of electrolyte; sealing, namely sealing the anodized cooker in a sealing agent at the temperature of 15-35 ℃ for 100-200 seconds; and (4) washing, namely washing the closed cooker by clear water and airing.
The pretreatment process for spraying the ceramic non-stick coating on the aluminum alloy cooker adopts a full-pulse direct-current power supply to carry out anodic oxidation, and meanwhile, the electrolyte contains sulfuric acid and oxalic acid, so that the process can realize larger current density, greatly reduce the time of anodic oxidation, reduce energy consumption, reduce cost and improve production efficiency.
The technical solution of the present invention is further described below with reference to specific examples.
Example 1:
a pretreatment process for spraying a ceramic non-stick coating on an aluminum alloy cooker comprises the following steps: degreasing, namely putting the cooker into a degreasing agent, wherein the temperature of the degreasing agent is 45 ℃, cleaning the surface of the cooker through the degreasing agent, and degreasing the surface of the cooker, wherein the degreasing reaction time is 20 seconds; acid neutralization, namely, putting the cooker into phosphoric acid, neutralizing the residual oil removal agent on the cooker by the phosphoric acid, wherein the temperature of the phosphoric acid is 40 ℃, the neutralization reaction time is 5 seconds, and then washing the cooker with water; anodizing, namely connecting the cooker with an anode of a full-pulse direct-current power supply, and then putting the cooker into electrolyte for anodizing, wherein the electrolyte formula is as follows: 100g/L of sulfuric acid, 7g/L of oxalic acid, 0.1g/L of aluminum ions, 0 ℃ of electrolyte, 180 seconds of anodic oxidation time and positive pulse current density A of full-pulse direct current power supply+At 3A/dm2, forward pulse current time t+30 seconds, negative pulse current density A-3A/dm2, negative pulse current time t-5 seconds, the termination voltage is 30V; sealing, namely sealing the cooker subjected to anodic oxidation in a sealing agent at the temperature of 15 ℃ for 100 seconds; and (4) washing, namely washing the closed cooker by clear water and airing.
After the treatment by the process, the film thickness of the conversion film layer reaches 10um, and the Vickers hardness HV0.5 is 150. The wear resistance of the ceramic non-stick coating coated on the aluminum alloy cooker can be improved by over 50 percent, and the adhesiveness, the hardness, the detergent resistance and the salt spray resistance are greatly improved.
Example 2:
aluminum alloy cookingThe pretreatment process for spraying the ceramic non-stick coating comprises the following steps: degreasing, namely putting the cooker into a degreasing agent, wherein the temperature of the degreasing agent is 50 ℃, cleaning the surface of the cooker through the degreasing agent, and degreasing the surface of the cooker, wherein the degreasing reaction time is 40 seconds; acid neutralization, namely, putting the cooker into phosphoric acid, neutralizing the residual oil removal agent on the cooker by the phosphoric acid, wherein the temperature of the phosphoric acid is 50 ℃, the neutralization reaction time is 12 seconds, and then washing the cooker with water; anodizing, namely connecting the cooker with an anode of a full-pulse direct-current power supply, and then putting the cooker into electrolyte for anodizing, wherein the electrolyte formula is as follows: 130g/L of sulfuric acid, 11g/L of oxalic acid and 5g/L of aluminum ions, the temperature of the electrolyte is 3 ℃, the anodic oxidation time is 390 seconds, and the forward pulse current density A of the full-pulse direct current power supply+At 4A/dm2, forward pulse current time t+45 seconds, negative pulse current density A-4A/dm2, negative pulse current time t-8 seconds, the termination voltage is 35V; sealing, namely sealing the anodized cooker in a sealing agent at the temperature of 20 ℃ for 150 seconds; and (4) washing, namely washing the closed cooker by clear water and airing.
After the treatment by the process, the film thickness of the conversion film layer reaches 20um, and the Vickers hardness HV0.5 is 180. The wear resistance of the ceramic non-stick coating coated on the aluminum alloy cooker can be improved by over 50 percent, and the adhesiveness, the hardness, the detergent resistance and the salt spray resistance are greatly improved.
Example 3:
a pretreatment process for spraying a ceramic non-stick coating on an aluminum alloy cooker comprises the following steps: degreasing, namely putting the cooker into a degreasing agent, wherein the temperature of the degreasing agent is 55 ℃, cleaning the surface of the cooker through the degreasing agent, and degreasing the surface of the cooker, wherein the degreasing reaction time is 60 seconds; acid neutralization, namely, putting the cooker into phosphoric acid, neutralizing the residual oil removal agent on the cooker by the phosphoric acid, wherein the temperature of the phosphoric acid is 60 ℃, the neutralization reaction time is 20 seconds, and then washing the cooker with water; anodizing, namely connecting the cooker with an anode of a full-pulse direct-current power supply, and then putting the cooker into electrolyte for anodizing, wherein the electrolyte formula is as follows: 160g/L of sulfuric acid, 15g/L of oxalic acid and 10g/L of aluminum ions, the temperature of the electrolyte is 6 ℃, the anodic oxidation time is 600 seconds, and full-pulse direct current is adoptedForward pulse current density A of current source+At 5A/dm2, forward pulse current time t+60 seconds, negative pulse current density A-5A/dm2, negative pulse current time t-10 seconds, the termination voltage is 40V; sealing, namely sealing the cooker subjected to anodic oxidation in a sealing agent at the temperature of 30 ℃ for 200 seconds; and (4) washing, namely washing the closed cooker by clear water and airing.
After the treatment by the process, the film thickness of the conversion film layer reaches 30um, and the Vickers hardness HV0.5 is 230. The wear resistance of the ceramic non-stick coating coated on the aluminum alloy cooker can be improved by over 50 percent, and the adhesiveness, the hardness, the detergent resistance and the salt spray resistance are greatly improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. The pretreatment process for spraying the ceramic non-stick coating on the aluminum alloy cooker is characterized by comprising the following steps of:
degreasing, namely putting the cooker into a degreasing agent, cleaning the surface of the cooker through the degreasing agent, and removing oil stains on the surface of the cooker;
acid neutralization, namely putting the cooker into phosphoric acid, neutralizing the residual oil removal agent on the cooker by the phosphoric acid, and then washing the cooker clean;
anodizing, namely connecting the cooker with an anode of a full-pulse direct-current power supply, and then putting the cooker into electrolyte for anodizing, wherein the electrolyte contains sulfuric acid and oxalic acid;
sealing, namely putting the cooker after anodic oxidation into a sealing agent for sealing treatment;
and (4) washing, namely washing the closed cooker by clear water and airing.
2. The aluminum alloy cookware sprayed ceramic non-stick coating pretreatment process as claimed in claim 1, wherein: the electrolyte formula is as follows: 100-160 g/L sulfuric acid, 7-15 g/L oxalic acid and 0.1-10 g/L aluminum ions.
3. The aluminum alloy cookware sprayed ceramic non-stick coating pretreatment process as claimed in claim 2, characterized in that: the temperature of the electrolyte is 0-6 ℃.
4. The aluminum alloy cookware sprayed ceramic non-stick coating pretreatment process as claimed in claim 2, characterized in that: the anodic oxidation time is 180-600 seconds, and the current density is 3-5A/dm2 。
5. The aluminum alloy cookware sprayed ceramic non-stick coating pretreatment process as claimed in claim 2, characterized in that: the forward pulse current density A + of the full-pulse direct-current power supply is 3-5A/dm2The positive pulse current time t + is 30-60 seconds, and the negative pulse current density A-is 3-5A/dm2The negative pulse current time t-is 5-10 seconds, and the final voltage is 30-40V.
6. The aluminum alloy cookware spray ceramic non-stick coating pretreatment process as claimed in any of claims 1 to 5, characterized in that: the temperature of the degreasing agent is 45-55 ℃, and the degreasing reaction time is 20-60 seconds.
7. The aluminum alloy cookware spray ceramic non-stick coating pretreatment process as claimed in any of claims 1 to 5, characterized in that: the temperature of the phosphoric acid is 40-60 ℃, and the neutralization reaction time is 5-20 seconds.
8. The aluminum alloy cookware spray ceramic non-stick coating pretreatment process as claimed in any of claims 1 to 5, characterized in that: the temperature of the sealing agent is 15-35 ℃, and the sealing treatment time is 100-200 seconds.
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| CN201911300234.7A CN111020665B (en) | 2019-12-17 | 2019-12-17 | Pretreatment process for spraying ceramic non-stick coating on aluminum alloy cooker |
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| CN115305464B (en) * | 2022-08-23 | 2024-02-06 | 江门市安诺特炊具制造有限公司 | Surface treatment method of aluminum alloy cooker and aluminum alloy cooker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB8923302D0 (en) * | 1989-10-16 | 1989-12-06 | Meyer Manuf Co Ltd | Cookware |
| CN1072872A (en) * | 1991-12-02 | 1993-06-09 | 颜彩玉 | Method for surface treatment of aluminium cauldron body |
| CN101019742B (en) * | 2007-03-23 | 2010-05-19 | 严卫星 | Making process of antiwear nonstick cooker |
| KR100869711B1 (en) * | 2007-07-26 | 2008-11-21 | 하상훈 | Processing method for surface-modifying of cookware |
| CN101396229B (en) * | 2008-10-13 | 2010-11-03 | 浙江苏泊尔股份有限公司 | Production method of lotus leaf type non-sticking cooking utensils |
| CN103173830A (en) * | 2011-12-24 | 2013-06-26 | 汤锦练 | Surface treatment method of aluminum product |
| CN103320837B (en) * | 2013-06-24 | 2016-01-20 | 江门市安诺特炊具制造有限公司 | A kind of surface black hardening process of aluminium cooking utensils |
| WO2015132297A1 (en) * | 2014-03-04 | 2015-09-11 | Friedrich-Alexander-Universität Erlangen-Nürnberg | Electrolyte for anodization and anodized surface |
| CN107723770A (en) * | 2016-08-12 | 2018-02-23 | 广东唐城美特智能工具有限公司 | A kind of pack alloy cooker surface microarc oxidation treatment process |
| CN108588787A (en) * | 2018-06-14 | 2018-09-28 | 如皋市华阳铝制品有限公司 | A kind of aluminum products surface anti sticking processing method |
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