CN105316742A - Electrolyte for aluminum alloy micro-arc oxidation to prepare ceramic coating and treatment method - Google Patents
Electrolyte for aluminum alloy micro-arc oxidation to prepare ceramic coating and treatment method Download PDFInfo
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- CN105316742A CN105316742A CN201410381219.0A CN201410381219A CN105316742A CN 105316742 A CN105316742 A CN 105316742A CN 201410381219 A CN201410381219 A CN 201410381219A CN 105316742 A CN105316742 A CN 105316742A
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- electrolytic solution
- arc oxidation
- aluminum alloy
- differential arc
- citric acid
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 title claims abstract description 14
- 239000003792 electrolyte Substances 0.000 title abstract description 10
- 238000005524 ceramic coating Methods 0.000 title abstract description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 60
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 54
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007864 aqueous solution Substances 0.000 claims abstract description 7
- 239000008151 electrolyte solution Substances 0.000 claims description 40
- 238000007254 oxidation reaction Methods 0.000 claims description 34
- 230000003647 oxidation Effects 0.000 claims description 33
- 239000000919 ceramic Substances 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000002386 leaching Methods 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 235000011194 food seasoning agent Nutrition 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011858 nanopowder Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Chemical Treatment Of Metals (AREA)
Abstract
The invention provides an electrolyte for aluminum alloy micro-arc oxidation to prepare a ceramic coating and a method for conducting surface treatment on the surface of aluminum alloy to obtain the ceramic coating by using the electrolyte. The electrolyte is an aqueous solution of citric acid, potassium hydroxide and sodium tungstate. The electrolyte comprises 10 g-20 g/L of citric acid, 5 g-10 g/L of potassium hydroxide and 1 g-5 g/L of sodium tungstate. Micro-arc oxidation is conducted on the surface of the aluminum alloy through the electrolyte so that the roughness of the surface of the ceramic coating can be effectively decreased; in addition, the time of micro-arc oxidation is shortened, the electric energy loss is reduced, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of electrolytic solution preparing ceramic film for aluminum alloy differential arc oxidation, and utilize this electrolytic solution process aluminum alloy surface to obtain the method for ceramic film.
Background technology
Aluminium alloy is widely used in the fields such as building, traffic, Aeronautics and Astronautics because of premium propertiess such as its quality are light, density is little, specific tenacity is high; On the other hand, because its hardness is low, fusing point is low and the shortcoming such as not wear-resisting, not anti-corrosion then needs to carry out surface modification treatment, to obtain more excellent performance.Differential arc oxidation is that the one of new emergence is in recent years on aluminium alloy and some other valve metals, by the combination of electrolytic solution and corresponding electrical parameter, at the TRANSIENT HIGH TEMPERATURE High Pressure that its surface relies on arc discharge to produce, grow the ceramic film based on substrate metal oxide.This layer of ceramic film under the prerequisite ensureing virgin metal materials'use performance, can be given material surface with property simultaneously, widens its scope of application.
But traditional micro-arc oxidation electrolyte mostly is silicate, borate, aluminate etc., and these electrolytic solution are all in weakly alkaline, prepared ceramic film, the a large amount of electric discharge Minute pores of its remained on surface, obviously presents the vestige of fusing after coagulation, causes rete smooth not around micropore.Chinese patent: electrolytic solution and the treatment process (publication number: CN101333673A of preparing nano ceramics rete for differential arc oxidation, publication date: 2008-12-31) point out, can by adding nano powder thus reducing the micropore caused in discharge process, but required is consuming time longer, need 30 – about 90min, comparatively large to the consume of electric energy like this, cost is higher, is unfavorable for suitability for industrialized production; In addition, ceramic film out prepared by traditional electrolyte is due to the overlong time of differential arc oxidation process, and cause surface comparatively coarse, microhardness distribution is uneven, so further limit again the range of application of Micro-Arc Oxidized Ceramic Coating, thus have impact on it and further promote.
Summary of the invention
For solving above-mentioned deficiency existing in aluminum alloy materials differential arc oxidization technique, the invention provides a kind of electrolytic solution preparing ceramic film for aluminum alloy differential arc oxidation, and utilize this electrolytic solution process aluminum alloy surface to obtain the method for ceramic film.
For reaching goal of the invention, the technical solution adopted in the present invention is:
Configuration electrolytic solution, and join in differential arc oxidation electrolyzer, with agitator, tank liquor is stirred in preparation process, electrolytic solution is distributed more even.
Described electrolytic solution is the aqueous solution of citric acid, potassium hydroxide and sodium wolframate, and electrolytic solution is composed as follows:
Citric acid 10-20g/L
Potassium hydroxide 5-10g/L
Sodium wolframate 1-5g/L
Solvent is deionized water.
Preferably, electrolytic solution is composed as follows:
Citric acid 16g/L
Potassium hydroxide 8g/L
Sodium wolframate 2g/L
Solvent is deionized water.
The invention still further relates to and utilize aforementioned electrolyte to carry out surface-treated method to aluminium alloy, described method comprises: adopt DC pulse micro-arc oxidation device to carry out differential arc oxidation to aluminum alloy surface, aluminium alloy is done anode leaching in the electrolytic solution, stainless steel vessel with cooling system is as negative electrode, and control current density is 30-40A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 8-20min, obtains the aluminium alloy of surface coating ceramic rete.
Preferably, described method is as follows: electrolytic solution consists of: citric acid 16g/L, potassium hydroxide 8g/L, sodium wolframate 2g/L, and solvent is deionized water; Adopt 20kW DC pulse micro-arc oxidation device to carry out differential arc oxidation to aluminum alloy surface, aluminium alloy is done anode leaching in the electrolytic solution, the stainless steel vessel of band cooling system is as negative electrode, and control current density is 30-40A/dm
2left and right, constantly stirring the lower constant current differential arc oxidation time is about 8-20min, obtains the aluminium alloy of surface coating ceramic rete.
Beneficial effect of the present invention is: (1) traditional micro-arc oxidation electrolyte many employings silicate, borate or aluminates system, these systems are all weakly alkaline, and the citric acid systems adopted in the present invention is slightly acidic, with this system do electrolytic solution prepare ceramic film time, the required differential arc oxidation time is shorter, electric energy loss reduces, cost-saving; (2) citric acid systems of the present invention, its weakly acidic ionogen can facilitate aluminum alloy surface homogeneous film formation, thus makes formed ceramic film smooth surface, and roughness is less; (3) the present invention is to the material, shape, size etc. of aluminium alloy without particular requirement, has good versatility, and simply effective, environmental protection.
Embodiment
Below in conjunction with concrete mode, the present invention is described further, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to scope.
Embodiment 1
Preparation of raw material: citric acid 20g, potassium hydroxide 17g, sodium wolframate 4g, deionized water 2L, aluminum alloy specimen.
Prepared by material: by above-mentioned composition, citric acid, potassium hydroxide and sodium wolframate are added in deionized water and be made into electrolytic solution, join in differential arc oxidation electrolyzer, and stir it.
20kW DC pulse micro-arc oxidation device is adopted to carry out differential arc oxidation to aluminum alloy surface, technical process is: sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, seasoning, electrolytic solution is the analytically pure aqueous solution, sample does anode leaching in the electrolytic solution, stainless steel vessel with cooling system is as negative electrode, and control current density is 30A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 8min, and the surface ceramii layer obtained is smooth, and roughness is little.
Embodiment 2
Preparation of raw material: citric acid 24g, potassium hydroxide 15g, sodium wolframate 4g, deionized water 2L, aluminum alloy specimen.
Prepared by material: by above-mentioned composition, citric acid, potassium hydroxide and sodium wolframate are added in deionized water and be made into electrolytic solution, join in differential arc oxidation electrolyzer, and stir it.
20kW DC pulse micro-arc oxidation device is adopted to carry out differential arc oxidation to aluminum alloy surface, technical process is: sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, seasoning, electrolytic solution is the analytically pure aqueous solution, sample does anode leaching in the electrolytic solution, stainless steel vessel with cooling system is as negative electrode, and control current density is 35A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 12min, and the surface ceramii layer obtained is smooth, and roughness is little.
Embodiment 3
Preparation of raw material: citric acid 28g, potassium hydroxide 17g, sodium wolframate 4g, deionized water 2L, aluminum alloy specimen.
Prepared by material: by above-mentioned composition, citric acid, potassium hydroxide and sodium wolframate are added in deionized water and be made into electrolytic solution, join in differential arc oxidation electrolyzer, and stir it.
20kW DC pulse micro-arc oxidation device is adopted to carry out differential arc oxidation to aluminum alloy surface, technical process is: sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, seasoning, electrolytic solution is the analytically pure aqueous solution, sample does anode leaching in the electrolytic solution, stainless steel vessel with cooling system is as negative electrode, and control current density is 38A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 15min, and the surface ceramii layer obtained is smooth, and roughness is little.
Embodiment 4
Preparation of raw material: citric acid 32g, potassium hydroxide 16g, sodium wolframate 4g, deionized water 2L, aluminum alloy specimen.
Prepared by material: by above-mentioned composition, citric acid, potassium hydroxide and sodium wolframate are added in deionized water and be made into electrolytic solution, join in differential arc oxidation electrolyzer, and stir it.
20kW DC pulse micro-arc oxidation device is adopted to carry out differential arc oxidation to aluminum alloy surface, technical process is: sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, seasoning, electrolytic solution is the analytically pure aqueous solution, sample does anode leaching in the electrolytic solution, stainless steel vessel with cooling system is as negative electrode, and control current density is 40A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 20min, and the surface ceramii layer obtained is smooth, and roughness is little.
Adopt the microhardness of HMV-IT microhardness tester test sample, the microhardness value at the sample difference place that table 1 is prepared for embodiment 1-4:
Table 1
| Embodiment | Microhardness (HV 0.2） |
| 1 | 1015,1098,1236,1132 |
| 2 | 1146,1178,1325,1266 |
| 3 | 1225,1478,1578,1624 |
| 4 | 1645,1732,1978,1866 |
As shown in Table 1, the ceramic layer microhardness value change that the inventive method obtains is less, is distributed between 1000 to 2000, is evenly distributed.
Claims (5)
1. prepare an electrolytic solution for ceramic film for aluminum alloy differential arc oxidation, it is characterized in that described electrolytic solution is the aqueous solution of citric acid, potassium hydroxide and sodium wolframate.
2. electrolytic solution according to claim 1, is characterized in that described electrolytic solution is composed as follows:
Citric acid 10-20g/L
Potassium hydroxide 5-10g/L
Sodium wolframate 1-5g/L
Solvent is deionized water.
3. electrolytic solution according to claim 2, is characterized in that described electrolytic solution is composed as follows:
Citric acid 16g/L
Potassium hydroxide 8g/L
Sodium wolframate 2g/L
Solvent is deionized water.
4. the electrolytic solution according to claim arbitrary in claim 1-3, surface-treated method is carried out to aluminium alloy, described method comprises: adopt DC pulse micro-arc oxidation device to carry out differential arc oxidation to aluminum alloy surface, aluminium alloy is done anode leaching in the electrolytic solution, stainless steel vessel with cooling system is as negative electrode, and control current density is 30-40A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 8-20min, obtains the aluminium alloy of surface coating ceramic rete.
5. electrolytic solution according to claim 3, carries out surface-treated method to aluminium alloy, and described method is as follows: electrolytic solution consists of: citric acid 16g/L, potassium hydroxide 8g/L, sodium wolframate 2g/L, and solvent is deionized water; Adopt 20kW DC pulse micro-arc oxidation device to carry out differential arc oxidation to aluminum alloy surface, aluminium alloy is done anode leaching in the electrolytic solution, the stainless steel vessel of band cooling system is as negative electrode, and control current density is 30-40A/dm
2, constantly stirring the lower constant current differential arc oxidation time is 8-20min, obtains the aluminium alloy of surface coating ceramic rete.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381219.0A CN105316742A (en) | 2014-08-05 | 2014-08-05 | Electrolyte for aluminum alloy micro-arc oxidation to prepare ceramic coating and treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381219.0A CN105316742A (en) | 2014-08-05 | 2014-08-05 | Electrolyte for aluminum alloy micro-arc oxidation to prepare ceramic coating and treatment method |
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| CN105316742A true CN105316742A (en) | 2016-02-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566409A (en) * | 2003-06-25 | 2005-01-19 | 王振波 | Method for plasma electrolytic oxidation preparation of ceramic oxide film and its products |
| CN101307477A (en) * | 2008-01-25 | 2008-11-19 | 哈尔滨工业大学 | Preparation method of high wear-resistant and anti-friction self-lubricating composite film layer on aluminum alloy surface |
| US20140110263A1 (en) * | 2012-10-19 | 2014-04-24 | University Of Pittsburgh | Superhydrophobic Anodized Metals and Method of Making Same |
-
2014
- 2014-08-05 CN CN201410381219.0A patent/CN105316742A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566409A (en) * | 2003-06-25 | 2005-01-19 | 王振波 | Method for plasma electrolytic oxidation preparation of ceramic oxide film and its products |
| CN101307477A (en) * | 2008-01-25 | 2008-11-19 | 哈尔滨工业大学 | Preparation method of high wear-resistant and anti-friction self-lubricating composite film layer on aluminum alloy surface |
| US20140110263A1 (en) * | 2012-10-19 | 2014-04-24 | University Of Pittsburgh | Superhydrophobic Anodized Metals and Method of Making Same |
Non-Patent Citations (5)
| Title |
|---|
| J.JOVOVIC等: ""spectroscopic characterization of plasma during electrolytic oxidation(PEO) of aluminium"", 《SURFACE & COATINGS TECHNOLOGY》 * |
| 中国机械工程学会热处理学会: "《热处理手册》", 31 October 2013, 机械工业出版社 * |
| 单德忠: "《机械装备工业节能减排制造技术》", 30 June 2014, 机械工业出版社 * |
| 王虹斌等: "《微弧氧化技术及其在海洋环境中的应用》", 30 September 2010, 国防工业出版社 * |
| 郝建民等: ""弱酸性介质中铝合金微弧氧化研究"", 《轻合金加工技术》 * |
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Application publication date: 20160210 |