CN104562141A - Aerial aluminum alloy micro-arc oxidation method - Google Patents
Aerial aluminum alloy micro-arc oxidation method Download PDFInfo
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- CN104562141A CN104562141A CN201510012245.0A CN201510012245A CN104562141A CN 104562141 A CN104562141 A CN 104562141A CN 201510012245 A CN201510012245 A CN 201510012245A CN 104562141 A CN104562141 A CN 104562141A
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- arc oxidation
- oxidation method
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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
- C25D11/024—Anodisation under pulsed or modulated current or potential
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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
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- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to an aerial aluminum alloy micro-arc oxidation method. By utilizing the aerial aluminum alloy micro-arc oxidation method, the film formation speed is improved, film formation electrolyte ingredients and enlarging initial impulsive discharge energy are improved at the same time, and voltage is introduced to a high-pressure discharge area to improve the thickness of membrane and ensure the quality of the membrane and film formation stability simultaneously. By utilizing the aerial aluminum alloy micro-arc oxidation method, the thickness of surface membrane of a 2A14 aluminum alloy part can reach more than 110 micrometers, sufficient grinding allowance is left for machining, the grinding luminosity and compactness requirements are ensured simultaneously, and the use requirements of roughness, hardness and thickness of an aeronautical part are met.
Description
Technical field
The present invention relates to a kind of aerolite differential arc oxidation method, especially a kind of thickness of the 2A14 of making aluminium alloy rete meets the differential arc oxidation method of service requirements.
Background technology
2A14 aluminium alloy is a kind of aviation aluminum alloy material, is widely used in aviation field.For meeting service index requirement, the part to prepared by this material is needed to carry out surface by micro-arc oxidation process, to form one deck differential arc oxidation film layer.For meeting the needs of following process, require that this micro-arc oxidation films layer thickness need reach more than 100 microns.Because this material does not have ripe micro-arc oxidation process, adopt the aluminum alloy differential arc oxidation technique of other type at present, as the micro-arc oxidation process of ZL105, ZL114 and 5A02 aluminium alloy is applied in 2A14 aluminium alloy, thicknesses of layers is less than 35 microns, its major cause is closely related with higher copper content in 2A14 aluminium alloy, copper is to the inhibition of reaction, to cause in micro-arc oxidation process that arcing time is long, voltage rise slowly, the comparatively light phenomenon such as inviolent of level of response, cause reacted rete thin.
Summary of the invention
The present invention seeks to a kind of 2A14 aluminum alloy differential arc oxidation method, realize the index that superficial film thickness reaches certain, meet service requirements.
Technical scheme of the present invention is, described aerolite differential arc oxidation method comprises the following steps:
(1) in differential arc oxidation cell body, microarc oxidation solution is prepared, the weight ratio of solution is potassium hydroxide 0.8-1.2g/L, water glass 3-5g/L, sodium tetraborate 0.3-0.6g/L, sodium aluminate 3-5g/L, and addition sequence is sodium aluminate, potassium hydroxide, water glass and sodium tetraborate;
(2) part is carried out oil removing, washing, oven dry, then non-differential of the arc surface is protected, adopt aluminum hanger to carry out clamping, the part after clamping is immersed in the microarc oxidation solution of cell body, ensure that hanger fully contacts with the anode in differential arc oxidation cell body;
(3) microarc oxidation equipment provided power supply is opened, parameters: forward current density 10-15A/dm
2, negative current: 1A; Forward dutycycle: 50%, negative sense dutycycle: 50%; Frequency: 50Hz; Reaction times: 1-3h; Press beginning key power supply and enter working order, treat that voltage rise is more than 430V, or when starting the arc phenomenon appears in piece surface, negative current density is set to 6-9A/dm
2, whole reaction process all cools with cooling apparatus, ensures that solution temperature is between 16-35 DEG C;
(4) powered-down after reaction, takes out part, unloads lower clamp, washing, oven dry;
(5) final inspection.
In described step (1), stir by clean pressurized air whole process to ensure that medicine carries out complete reaction in process for preparation; In described step (2), the height that part is immersed in the microarc oxidation solution of cell body is that part upper surface is apart from liquid level 5-10cm; In described step (3), carry out whole process with pressurized air in micro-arc oxidation process and stir, ensure the homogeneity of solution mixing and the consistence of temperature of reaction.
The present invention is by analyzing the slow and thin reason of 2A14 aluminium alloy film forming speed, film forming speed is improved by improving film forming bath composition and strengthening initial reaction stage pulse discharging energy, voltage is incorporated into electrion region, after making rete enter the quick rise period, fixed pulse discharge energy is to reach coating growth, dissolving, regrowth, to dissolve the equilibrium conditions so circulated again, ensures film quality and film forming stability while improving thicknesses of layers.The present invention can make 2A14 aluminum alloy part superficial film thickness reach more than 110 microns, wherein account for 2/5 of total thickness to matrix outgrowth thickness, inside growth thickness accounts for 3/5, decrease the ratio shared by outer tectorium, for mechanical workout leave abundant grinding tolerance while ensure that the luminosity after grinding and density requirement, reach the service requirements of aircraft parts roughness, hardness and thickness.
Embodiment
Aerolite differential arc oxidation method comprises the following steps:
(1) in differential arc oxidation cell body, microarc oxidation solution is prepared, the weight ratio of solution is potassium hydroxide 0.8-1.2g/L, water glass 3-5g/L, sodium tetraborate 0.3-0.6g/L, sodium aluminate 3-5g/L, and addition sequence is sodium aluminate, potassium hydroxide, water glass and sodium tetraborate;
(2) part is carried out oil removing, washing, oven dry, then non-differential of the arc surface is protected, adopt aluminum hanger to carry out clamping, the part after clamping is immersed in the microarc oxidation solution of cell body, ensure that hanger fully contacts with the anode in differential arc oxidation cell body;
(3) microarc oxidation equipment provided power supply is opened, parameters: forward current density 10-15A/dm
2, negative current: 1A; Forward dutycycle: 50%, negative sense dutycycle: 50%; Frequency: 50Hz; Reaction times: 1-3h; Press beginning key power supply and enter working order, treat that voltage rise is more than 430V, or when starting the arc phenomenon appears in piece surface, negative current density is set to 6-9A/dm
2, whole reaction process all cools with cooling apparatus, ensures that solution temperature is between 16-35 DEG C;
(4) powered-down after reaction, takes out part, unloads lower clamp, washing, oven dry;
(5) final inspection.
In described step (1), stir by clean pressurized air whole process to ensure that medicine carries out complete reaction in process for preparation; In described step (2), the height that part is immersed in the microarc oxidation solution of cell body is that part upper surface is apart from liquid level 5-10cm; In described step (3), carry out whole process with pressurized air in micro-arc oxidation process and stir, ensure the homogeneity of solution mixing and the consistence of temperature of reaction.
Embodiment
Aviation type 2A14 aluminium alloy lubricating oil pump base, require that the thicknesses of layers after differential arc oxidation is greater than 100 microns, its concrete implementation step is as follows:
(1) in cell body, microarc oxidation solution is prepared, solution ratio is potassium hydroxide 1g/L, water glass 4g/L, sodium tetraborate 0.5g/L, sodium aluminate 3g/L (being weight ratio), addition sequence is sodium aluminate, potassium hydroxide, water glass and sodium tetraborate, stirs to ensure that medicine carries out complete reaction in process for preparation by clean pressurized air whole process;
(2) part is carried out oil removing, washing, oven dry, then non-differential of the arc surface is protected, adopt aluminum hanger to carry out clamping, the part after clamping is immersed in cell body, immersing is highly part upper surface distance liquid level 5cm, ensures that hanger fully contacts with the anode in differential arc oxidation cell body;
(3) microarc oxidation equipment provided power supply is opened, parameters: forward current density 14A/dm
2, negative current: 1A; Forward dutycycle: 50%, negative sense dutycycle: 50%; Frequency: 50Hz; Reaction times: 2.5h; Press beginning key power supply and enter working order, when voltage rise is 450V, negative current density is set to 8A/dm
2, whole reaction process all cools with cooling apparatus, ensures that solution temperature is between 16-35 DEG C, and carries out whole process stirring with pressurized air, ensures the homogeneity of solution mixing and the consistence of temperature of reaction;
(4) powered-down after reaction, takes out part, unloads lower clamp, washing, oven dry;
(5) final inspection, on part, choose 10 points with eddy current thickness meter and carry out thicknesses of layers measurement, average, thicknesses of layers is 125 μm.Conclusion is qualified.
Claims (4)
1. an aerolite differential arc oxidation method, is characterized in that, described method comprises the following steps:
(1) in differential arc oxidation cell body, microarc oxidation solution is prepared, the weight ratio of solution is potassium hydroxide 0.8-1.2g/L, water glass 3-5g/L, sodium tetraborate 0.3-0.6g/L, sodium aluminate 3-5g/L, and addition sequence is sodium aluminate, potassium hydroxide, water glass and sodium tetraborate;
(2) part is carried out oil removing, washing, oven dry, then non-differential of the arc surface is protected, adopt aluminum hanger to carry out clamping, the part after clamping is immersed in the microarc oxidation solution of cell body, ensure that hanger fully contacts with the anode in differential arc oxidation cell body;
(3) microarc oxidation equipment provided power supply is opened, parameters: forward current density 10-15A/dm
2, negative current: 1A; Forward dutycycle: 50%, negative sense dutycycle: 50%; Frequency: 50Hz; Reaction times: 1-3h; Press beginning key power supply and enter working order, treat that voltage rise is more than 430V, or when starting the arc phenomenon appears in piece surface, negative current density is set to 6-9A/dm
2, whole reaction process all cools with cooling apparatus, ensures that solution temperature is between 16-35 DEG C;
(4) powered-down after reaction, takes out part, unloads lower clamp, washing, oven dry;
(5) final inspection.
2. aerolite differential arc oxidation method as claimed in claim 1, is characterized in that, in described step (1), stirs to ensure that medicine carries out complete reaction in process for preparation by clean pressurized air whole process.
3. aerolite differential arc oxidation method as claimed in claim 1, is characterized in that, in described step (2), the height that part is immersed in the microarc oxidation solution of cell body is that part upper surface is apart from liquid level 5-10cm.
4. aerolite differential arc oxidation method as claimed in claim 1, is characterized in that, in described step (3), carries out whole process stir in micro-arc oxidation process with pressurized air, ensures the homogeneity of solution mixing and the consistence of temperature of reaction.
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| CN201510012245.0A CN104562141A (en) | 2015-01-09 | 2015-01-09 | Aerial aluminum alloy micro-arc oxidation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239127A (en) * | 2015-11-13 | 2016-01-13 | 哈尔滨东安发动机（集团）有限公司 | Micro-arc oxidation method for cast aluminium alloy semi-closed inner cavity |
| CN106894069A (en) * | 2017-01-24 | 2017-06-27 | 西安天奥新材料科技有限公司 | Wear-resisting, corrosion resistant the oil field preparation method and plunger of aluminium alloy plunger |
| CN110129853A (en) * | 2018-02-02 | 2019-08-16 | 本田技研工业株式会社 | Anode oxide film forms inorganic agent and anode oxide film forming method |
| CN110965100A (en) * | 2019-11-29 | 2020-04-07 | 中国航发沈阳黎明航空发动机有限责任公司 | Micro-arc oxidation and hard anodization process method for forged aluminum alloy cylinder |
| CN114657619A (en) * | 2020-12-22 | 2022-06-24 | 富联裕展科技(深圳)有限公司 | Preparation method of metal piece surface oxidation film and metal piece surface oxidation film |
-
2015
- 2015-01-09 CN CN201510012245.0A patent/CN104562141A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239127A (en) * | 2015-11-13 | 2016-01-13 | 哈尔滨东安发动机（集团）有限公司 | Micro-arc oxidation method for cast aluminium alloy semi-closed inner cavity |
| CN106894069A (en) * | 2017-01-24 | 2017-06-27 | 西安天奥新材料科技有限公司 | Wear-resisting, corrosion resistant the oil field preparation method and plunger of aluminium alloy plunger |
| CN106894069B (en) * | 2017-01-24 | 2019-01-15 | 西安天奥新材料科技有限公司 | The preparation method and plunger of wear-resisting, corrosion resistant oil field aluminium alloy plunger |
| CN110129853A (en) * | 2018-02-02 | 2019-08-16 | 本田技研工业株式会社 | Anode oxide film forms inorganic agent and anode oxide film forming method |
| CN110965100A (en) * | 2019-11-29 | 2020-04-07 | 中国航发沈阳黎明航空发动机有限责任公司 | Micro-arc oxidation and hard anodization process method for forged aluminum alloy cylinder |
| CN114657619A (en) * | 2020-12-22 | 2022-06-24 | 富联裕展科技(深圳)有限公司 | Preparation method of metal piece surface oxidation film and metal piece surface oxidation film |
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Application publication date: 20150429 |