CN106435683A - Electrolyte for preparing wear-resistant ceramic coating through micro-arc oxidation of aluminium alloy and treatment method of electrolyte - Google Patents
Electrolyte for preparing wear-resistant ceramic coating through micro-arc oxidation of aluminium alloy and treatment method of electrolyte Download PDFInfo
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- CN106435683A CN106435683A CN201510510826.7A CN201510510826A CN106435683A CN 106435683 A CN106435683 A CN 106435683A CN 201510510826 A CN201510510826 A CN 201510510826A CN 106435683 A CN106435683 A CN 106435683A
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- electrolyte
- arc oxidation
- aluminium alloy
- differential arc
- potassium hydroxide
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Abstract
The invention provides an electrolyte for preparing a wear-resistant ceramic coating through micro-arc oxidation of aluminium alloy and a method for using the electrolyte to treat the surface of the aluminium alloy to obtain the ceramic coating. The electrolyte is a water solution including sodium hexametaphosphate, potassium hydroxide, glycerin and sodium borate. The electrolyte comprises the following components of 20-40 g/L of sodium hexametaphosphate, 1-5 g/L of potassium hydroxide, 15-25 g/L of glycerin, 2-15 g/L of sodium borate and deionized water as a solvent. According to the invention, the electrolyte is used for conducting micro-arc oxidation on the surface of the aluminium alloy, so that the roughness of the surface of the ceramic coating can be effectively reduced, the wear resistance is improved, the micro-arc oxidation time is shortened, the electric energy loss is reduced, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of aluminum alloy differential arc oxidation prepares the electrolyte of wear-resistant ceramic film layer, and process, using this electrolyte, the method that aluminum alloy surface obtains wear-resistant ceramic film layer.
Background technology
Background technology describes paragraph.Aluminium alloy because its light weight, the premium properties such as density is little, specific strength is high and be widely used in the fields such as building, Aeronautics and Astronautics, auto industry；On the other hand, because its hardness is low, fusing point is low, oxide-film that is not wear-resisting and being formed only has 1 ~ 2 nm then to need to carry out surface modification treatment the shortcomings of thick, to obtain more excellent performance.Differential arc oxidation is one kind of new emergence in recent years on aluminum, magnesium, titanium and its alloy, by combining of electrolyte and corresponding electrical quantity, the TRANSIENT HIGH TEMPERATURE high pressure that arc discharge produces is relied on to act on its surface, growth in situ goes out the ceramic film based on substrate metal oxide.This layer of ceramic film can give material surface with property, to widen its scope of application on the premise of ensureing virgin metal materials'use performance simultaneously.
But, traditional micro-arc oxidation electrolyte mostly is silicate, borate, aluminate etc., prepared ceramic film, the substantial amounts of electric discharge Minute pores of its remained on surface, and after being rendered obvious by around micropore melting, the vestige of solidification, leads to film layer not smooth.In addition, the differential arc oxidation process time being generally used for preparing wear-resistant aluminum alloy is 50 ~ 200min, and because process time is long, prepared coating is more coarse, microhardness distribution is uneven, thus further limit the range of application of Micro-Arc Oxidized Ceramic Coating, thus have impact on it further promoting.
Content of the invention
For the above-mentioned deficiency in the presence of solution aluminum alloy materials differential arc oxidization technique, the invention provides a kind of aluminum alloy differential arc oxidation prepares the electrolyte of wear-resistant ceramic film layer, and process, using this electrolyte, the method that aluminum alloy surface obtains ceramic film.
For reaching goal of the invention, the technical solution adopted in the present invention is：Configuration electrolyte, and be added in differential arc oxidation electrolysis bath, with agitator, tank liquor is stirred in preparation process, so that electrolyte is distributed more uniform.
Described electrolyte is sodium hexameta phosphate, the aqueous solution of potassium hydroxide, glycerol and sodium borate, and electrolyte composition is as follows：
Sodium hexameta phosphate 20-40
g/L
Potassium hydroxide
1 - 5 g/L
Glycerol
15 - 25 g/L
Sodium borate
2 -15 g/L
Solvent is deionized water.
Preferably, electrolyte composition is as follows：
Sodium hexameta phosphate 30 g/L
Potassium hydroxide
3 g/L
Glycerol
15 g/L
Sodium borate
8 g/L
Solvent is deionized water.
The invention still further relates to method aluminium alloy being surface-treated using aforementioned electrolyte, methods described includes：Differential arc oxidation is carried out to aluminum alloy surface using DC pulse micro-arc oxidation device, aluminium alloy is made anode and soaks in the electrolytic solution, as negative electrode, control electric current density is 8-12A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 20-30 min, obtain the aluminium alloy of surface coating ceramic film layer.
Preferably, methods described is as follows：Electrolyte consists of：Sodium hexameta phosphate 30 g/L, potassium hydroxide 3 g/L, glycerol 15 g/L, sodium borate 8 g/L, solvent is deionized water；Using 20 kW DC pulse micro-arc oxidation devices, differential arc oxidation is carried out to aluminum alloy surface, aluminium alloy is made anode and soaks in the electrolytic solution, as negative electrode, control electric current density is 8-12 A/dm to the rustless steel container with cooling system2Left and right, being stirred continuously lower constant current differential arc oxidation time is 20-30 min, obtains the aluminium alloy of surface coating ceramic film layer.
Beneficial effects of the present invention are：（1）Oxygen atom in sodium borate has mobility, surface roughness can be reduced, and glycerol can reduce the severe degree of reaction as stabilizer, formed hole is made to reduce, crackle reduces, with reference to more contributing to, acquisition surface is more smooth for the two, and roughness is less, and the more preferable ceramic film of wearability performance；（2）The differential arc oxidation time is shorter, electric energy is consumed little, cost is relatively low, beneficial to industrialized production；（3）The present invention, to the no particular/special requirement such as the material of aluminium alloy, shape, size, has good versatility, and raw material is very cheap, be easy to get.
Specific embodiment
With reference to concrete mode, the present invention is described further it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, broadly fall into the scope of the present invention.
Embodiment 1：
Preparation of raw material：Sodium hexameta phosphate 56 g, potassium hydroxide 6 g, glycerol 32 g and sodium borate 16g deionized water 2 L, aluminum alloy specimen.
Prepared by material：By above-mentioned composition, sodium hexameta phosphate, potassium hydroxide, glycerol and sodium borate are added in deionized water and is made into electrolyte, be added in differential arc oxidation electrolysis bath, and it is stirred.
Using 20 kW DC pulse micro-arc oxidation devices, differential arc oxidation is carried out to aluminum alloy surface, technological process is：Sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, natural drying, electrolyte is analytically pure aqueous solution, sample is made anode and is soaked in the electrolytic solution, and as negative electrode, control electric current density is 10A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 25 min, the surface ceramii layer obtaining is smooth, and roughness is little.
Embodiment 2：
Preparation of raw material：Sodium hexameta phosphate 60 g, potassium hydroxide 6 g, glycerol 36 g and sodium borate 16g deionized water 2 L, aluminum alloy specimen.
Prepared by material：By above-mentioned composition, sodium hexameta phosphate, potassium hydroxide, glycerol and sodium borate are added in deionized water and is made into electrolyte, be added in differential arc oxidation electrolysis bath, and it is stirred.
Using 20 kW DC pulse micro-arc oxidation devices, differential arc oxidation is carried out to aluminum alloy surface, technological process is：Sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, natural drying, electrolyte is analytically pure aqueous solution, sample is made anode and is soaked in the electrolytic solution, and as negative electrode, control electric current density is 10 A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 25 min, the surface ceramii layer obtaining is smooth, and roughness is little.
Embodiment 3：
Preparation of raw material：Sodium hexameta phosphate 64 g, potassium hydroxide 6 g, glycerol 40 g and sodium borate 16g deionized water 2 L, aluminum alloy specimen.
Prepared by material：By above-mentioned composition, sodium hexameta phosphate, potassium hydroxide, glycerol and sodium borate are added in deionized water and is made into electrolyte, be added in differential arc oxidation electrolysis bath, and it is stirred.
Using 20 kW DC pulse micro-arc oxidation devices, differential arc oxidation is carried out to aluminum alloy surface, technological process is：Sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, natural drying, electrolyte is analytically pure aqueous solution, sample is made anode and is soaked in the electrolytic solution, and as negative electrode, control electric current density is 8 A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 30 min, the surface ceramii layer obtaining is smooth, and roughness is little.
Embodiment 4：
Preparation of raw material：Sodium hexameta phosphate 65 g, potassium hydroxide 6 g, glycerol 44 g and sodium borate 16g deionized water 2 L, aluminum alloy specimen.
Prepared by material：By above-mentioned composition, sodium hexameta phosphate, potassium hydroxide, glycerol and sodium borate are added in deionized water and is made into electrolyte, be added in differential arc oxidation electrolysis bath, and it is stirred.
Using 20 kW DC pulse micro-arc oxidation devices, differential arc oxidation is carried out to aluminum alloy surface, technological process is：Sand papering, oil removing, deionized water, rinsing, differential arc oxidation, tap water rinse, natural drying, electrolyte is analytically pure aqueous solution, sample is made anode and is soaked in the electrolytic solution, and as negative electrode, control electric current density is 12 A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 20 min, the surface ceramii layer obtaining is smooth, and roughness is little.
Using the microhardness of HMV-IT microhardness testers test sample,Table 1For the microhardness value at the sample difference of embodiment 1-4 preparation：
Table 1Table 1
| Embodiment | Microhardness（HV0.2） |
| 1 | 1315,1698,1536,1432 |
| 2 | 1446,1778,1825,1666 |
| 3 | 1895,1965,1898,1724 |
| 4 | 2345,2032,1978,2166 |
ByTable 1Understand, the ceramic film microhardness value changes that the inventive method obtains are less, are distributed between 1300 to 2400, are evenly distributed.
Using the wear extent of HT-600 friction wear testing machine test sample,Table 2Wear extent for the sample of embodiment 1-4 preparation：
Table 2Table 2
| Embodiment | Wear extent（wear loss/mg） |
| 1 | 0.12 |
| 2 | 0.14 |
| 3 | 0.13 |
| 4 | 0.11 |
ByTable 2Understand, the wear extent change of the ceramic coating that the inventive method obtains is less, is distributed between 0.11 to 0.14 mg, distribution is more average.
Claims (5)
1. a kind of aluminum alloy differential arc oxidation prepares the electrolyte of wear-resistant ceramic film layer and processing method it is characterised in that described electrolyte is sodium hexameta phosphate, the aqueous solution of potassium hydroxide, glycerol and sodium borate.
2. electrolyte according to claim 1 is it is characterised in that described electrolyte composition is as follows：
Sodium hexameta phosphate
20 - 40 g/L
Potassium hydroxide
1 - 5 g/L
Glycerol
15 - 25 g/L
Sodium borate
2 -15 g/L
Solvent is deionized water.
3. electrolyte according to claim 2 is it is characterised in that described electrolyte composition is as follows：
Sodium hexameta phosphate
30 g/L
Potassium hydroxide
3 g/L
Glycerol
15 g/L
Sodium borate
8 g/L
Solvent is deionized water.
4. the electrolyte according to any claim in claim 1-3, the method that aluminium alloy is surface-treated, methods described includes：Differential arc oxidation is carried out to aluminum alloy surface using DC pulse micro-arc oxidation device, aluminium alloy is made anode and soaks in the electrolytic solution, as negative electrode, control electric current density is 8-12 A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 20-30 min, obtain the aluminium alloy of surface coating ceramic film layer.
5. electrolyte according to claim 3, the method that aluminium alloy is surface-treated, methods described is as follows：Electrolyte consists of：Sodium hexameta phosphate 30 g/L, potassium hydroxide 3 g/L, glycerol 15 g/L, sodium borate 8 g/L, solvent is deionized water；Using 20 kW DC pulse micro-arc oxidation devices, differential arc oxidation is carried out to aluminum alloy surface, aluminium alloy is made anode and soaks in the electrolytic solution, as negative electrode, control electric current density is 8-12 A/dm to the rustless steel container with cooling system2, it is stirred continuously the lower constant current differential arc oxidation time for 20-30 min, obtain the aluminium alloy of surface coating ceramic film layer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937952A (en) * | 2017-11-22 | 2018-04-20 | 中国科学院海洋研究所 | A kind of electrolyte and its application suitable for aluminium and aluminum alloy differential arc oxidation |
| CN110965105A (en) * | 2020-01-06 | 2020-04-07 | 山西银光华盛镁业股份有限公司 | Heterogeneous material same-groove micro-arc oxidation electrolyte |
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| CN110965105A (en) * | 2020-01-06 | 2020-04-07 | 山西银光华盛镁业股份有限公司 | Heterogeneous material same-groove micro-arc oxidation electrolyte |
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