CN107460517A - A kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating - Google Patents
A kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating Download PDFInfo
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- CN107460517A CN107460517A CN201610392056.5A CN201610392056A CN107460517A CN 107460517 A CN107460517 A CN 107460517A CN 201610392056 A CN201610392056 A CN 201610392056A CN 107460517 A CN107460517 A CN 107460517A
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- cast aluminium
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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
- C25D11/026—Anodisation with spark discharge
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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
Abstract
The invention provides a kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating, step are as follows：（1）Electrolyte is configured, the composition concentration of electrolyte is：The g/L of sodium metasilicate 20 30, the g/L of potassium hydroxide 27, the g/L of glycerine 15 25, sodium fluoride 3 18 g/L, EDTA 38 g/L, the g/L of thiocarbamide 29, the g/L of hexa 20 80, the g/L of nano titanium oxide 10 70；（2）Differential arc oxidation is carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device, current density is 5 15 A/dm2, frequency is 500 HZ, and dutycycle 4%, for temperature control at 20 30 DEG C, it is 10 30 min to be stirred continuously the lower constant current differential arc oxidation time.Nano titanium oxide incorporates ceramic film in the present invention, improves the corrosion resistance of film layer；The organic matters such as thiocarbamide, hexa are added in the electrolyte, in cast aluminium Surface Creation organic film, can be corroded with antibiont；Preparation time is short, and cost is relatively low, beneficial to industrialized production.
Description
Technical field
The present invention relates to a kind of preparation method of cast aluminium Micro-Arc Oxidized Ceramic Coating, more particularly to a kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating.
Background technology
Cast aluminium is widely used in high iron catenary.Aluminium stock number is big, and its proportion is smaller, specific strength is high and easy to process, is the second largest metalloid material for being only second to ferrous materials in the usage amount of industry.And the proportion of commercial Application has the trend constantly increased.But the chemistry of aluminium is more active compared to other metallines, surface can form one layer of very thin pellumina quickly when exposing in atmosphere.Secondly cast aluminium case hardness is low, corrosion resistance is poor, and oxide-film only has 1 ~ 2nm thickness, and easily by acid or caustic corrosion, effect is little in actual applications, a variety of development and applications for all constraining aluminium alloy of the above.It is all cast aluminium surface to be modified, improve its decay resistance.
Differential arc oxidization technique be the one kind newly to emerge in recent years on aluminium and its alloy, by the combination of electrolyte and corresponding electrical parameter, rely on TRANSIENT HIGH TEMPERATURE high pressure caused by arc discharge to act on its surface, growth in situ goes out the ceramic film based on substrate metal oxide.This layer of ceramic film can be on the premise of virgin metal materials'use performance be ensured, while assigns material surface with property, to widen its scope of application.
But traditional micro-arc oxidation electrolyte is mostly the metallic salts such as silicate, prepared ceramic film, its remained on surface substantial amounts of electric discharge Minute pores, corrosion resistance are not good enough.The differential arc oxidation processing time for being generally used for preparing wear-resistant aluminum alloy is 30-100min or so, and because processing time is long, prepared coating is more coarse, microhardness distribution is uneven, the application of Micro-Arc Oxidized Ceramic Coating is thus further limited, so as to have impact on its further popularization.
The content of the invention
To solve the above-mentioned deficiency in the presence of casting aluminium material differential arc oxidization technique, the invention provides a kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating.
To reach goal of the invention, the technical solution adopted in the present invention is：
A kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating, comprises the following steps：
（1）Electrolyte is configured, the composition concentration of electrolyte is：Sodium metasilicate 20-30
G/L, potassium hydroxide 2-7 g/L, glycerine 15-25
G/L, sodium fluoride 3-18 g/L, EDTA
3-8 g/L, thiocarbamide 2-9 g/L, hexa 20-80
G/L, nano titanium oxide 10-70 g/L；
（2）Differential arc oxidation, current density 5-15 are carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device
A/dm2, frequency is 200 HZ, and dutycycle 5%, for temperature control at 20-30 DEG C, it is 10-30 min to be stirred continuously the lower constant current differential arc oxidation time.
Step（1）In preferable electrolyte composition concentration be：Sodium metasilicate 25
G/L, the g/L of potassium hydroxide 5, glycerine 20
G/L, sodium fluoride 10 g/L, EDTA
7 g/L, the g/L of thiocarbamide 5, hexa 50
G/L, the g/L of nano titanium oxide 15.
The step（1）The particle diameter of middle nano titanium oxide is 20-50 μm.
The step（2）In preferable electrical parameter be：Current density is 8 A/dm2, frequency 200HZ, dutycycle 5%, it is 15 min to be stirred continuously the lower constant current differential arc oxidation time.
The cast aluminium typically refers to the conventional cast aluminium such as ZL101A.
Beneficial effects of the present invention are：（1）Nano titanium oxide incorporates ceramic film, improves the corrosion resistance of film layer；（2）The organic matters such as thiocarbamide, hexa are added in the electrolyte, in cast aluminium Surface Creation organic film, can be corroded with antibiont；（3）Preparation time is short, and cost is relatively low, beneficial to industrialized production.
Embodiment
With reference to concrete mode, the present invention is described further, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of the present invention.
Embodiment 1：
（1）Electrolyte is configured, the composition concentration of electrolyte is：Sodium metasilicate 25
G/L, the g/L of potassium hydroxide 5, glycerine 20
G/L, sodium fluoride 12 g/L, EDTA
7 g/L, the g/L of thiocarbamide 5, hexa 50
G/L, the g/L of nano titanium oxide 15；
（2）Differential arc oxidation, current density 8 are carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device
A/dm2, frequency is 200 HZ, and dutycycle 5%, for temperature control at 20-30 DEG C, it is 15 min to be stirred continuously the lower constant current differential arc oxidation time.
Embodiment 2：
（1）Electrolyte is configured, the composition concentration of electrolyte is：Sodium metasilicate 25
G/L, the g/L of potassium hydroxide 5, glycerine 20
G/L, sodium fluoride 12 g/L, EDTA
7 g/L, the g/L of thiocarbamide 5, hexa 50
G/L, the g/L of nano titanium oxide 25；
（2）Differential arc oxidation, current density 8 are carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device
A/dm2, frequency is 200 HZ, and dutycycle 5%, for temperature control at 20-30 DEG C, it is 15 min to be stirred continuously the lower constant current differential arc oxidation time.
Embodiment 3：
（1）Electrolyte is configured, the composition concentration of electrolyte is：Sodium metasilicate 25
G/L, the g/L of potassium hydroxide 5, glycerine 20
G/L, sodium fluoride 12 g/L, EDTA
7 g/L, the g/L of thiocarbamide 5, hexa 50
G/L, the g/L of nano titanium oxide 40；
（2）Differential arc oxidation, current density 8 are carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device
A/dm2, frequency is 200 HZ, and dutycycle 5%, for temperature control at 20-30 DEG C, it is 15 min to be stirred continuously the lower constant current differential arc oxidation time.
Embodiment 4：
（1）Electrolyte is configured, the composition concentration of electrolyte is：Sodium metasilicate 25
G/L, the g/L of potassium hydroxide 5, the g/L of glycerine 20, sodium fluoride 12 g/L, EDTA 7 g/L, the g/L of thiocarbamide 5, the g/L of hexa 50, the g/L of nano titanium oxide 60；
（2）Differential arc oxidation, current density 8 are carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device
A/dm2, frequency is 200 HZ, and dutycycle 5%, for temperature control at 20-30 DEG C, it is 15 min to be stirred continuously the lower constant current differential arc oxidation time.
In the course of reaction of differential arc oxidation, Al matrixes and the O in electrolysis water2Reaction generates Al2O3, Al afterwards2O3With TiO2Reaction generates anti-corrosion phase Al4（TiO4）3, so the corrosion resistance of aluminum alloy differential arc oxidation film layer is improved, with TiO2The lifting of content, the corrosion resistance of film layer are become better and better, and reaction equation is as follows：
Al+O2→Al2O3
Al2O3+TiO2→Al4(TiO4)3
The corrosion potential and corrosion current of test sample are drawn using dynamic potential polarization curve test, data are shown in Table 1：
Table 1
| Embodiment | Ecorr (V vs.SCE) | icorr (A/cm2) |
| 1 | -0.75 | 3.45×10-8 |
| 2 | -0.74 | 9.94×10-9 |
| 3 | -0.69 | 1.34×10-9 |
| 4 | -0.65 | 8.72×10-10 |
As shown in Table 1, the corrosion resistance for the ceramic film that the inventive method obtains substantially improves, and as the increase of nano titanium oxide concentration, corrosion current are obviously reduced, and corrosion potential dramatically increases.
Claims (5)
1. a kind of preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating, it is characterised in that comprise the following steps：
（1）Electrolyte is configured, the composition concentration of electrolyte is：Sodium metasilicate 20-30 g/L, potassium hydroxide 2-7 g/L, glycerine 15-25 g/L, sodium fluoride 3-18 g/L, EDTA 3-8 g/L, thiocarbamide 2-9 g/L, hexa 20-80 g/L, nano titanium oxide 10-70 g/L；
（2）Differential arc oxidation, current density 5-15 are carried out to the cast aluminium surface after cleaning using DC pulse micro-arc oxidation device
A/dm2, frequency is 200 HZ, and dutycycle 5%, for temperature control at 20-30 DEG C, it is 10-30 min to be stirred continuously the lower constant current differential arc oxidation time.
2. the preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating according to claim 1, it is characterised in that step（1）The composition concentration of middle electrolyte is：The g/L of sodium metasilicate 25, the g/L of potassium hydroxide 5, the g/L of glycerine 20, sodium fluoride 10 g/L, EDTA 7 g/L, the g/L of thiocarbamide 5, the g/L of hexa 50, the g/L of nano titanium oxide 15.
3. the preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating according to claim 1, it is characterised in that step（1）The particle diameter of middle nano titanium oxide is 20-50 μm.
4. the preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating according to claim 1, it is characterised in that step（2）Middle electrical parameter is：Current density is 8 A/dm2, frequency 200HZ, dutycycle 5%, it is 15 min to be stirred continuously the lower constant current differential arc oxidation time.
5. the preparation method of high corrosion-resistant cast aluminium Micro-Arc Oxidized Ceramic Coating according to claim 1, it is characterised in that the cast aluminium typically refers to the conventional cast aluminium such as ZL101A.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108277516A (en) * | 2018-04-13 | 2018-07-13 | 中国人民解放军陆军装甲兵学院 | A kind of micro-arc oxidation electrolyte and a kind of preparation method of micro-arc oxidation films |
| CN108385150A (en) * | 2018-03-05 | 2018-08-10 | 中国人民解放军陆军装甲兵学院 | A kind of laminated film and preparation method thereof |
Citations (2)
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| JPS49106932A (en) * | 1973-02-19 | 1974-10-11 | ||
| CN102230205A (en) * | 2011-06-20 | 2011-11-02 | 华南理工大学 | Aluminum alloy micro-arc oxidation black ceramic membrane and preparation method thereof |
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- 2016-06-06 CN CN201610392056.5A patent/CN107460517A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49106932A (en) * | 1973-02-19 | 1974-10-11 | ||
| CN102230205A (en) * | 2011-06-20 | 2011-11-02 | 华南理工大学 | Aluminum alloy micro-arc oxidation black ceramic membrane and preparation method thereof |
Non-Patent Citations (3)
| Title |
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| 姬磊等: "ZLSi7Cu2Mg合金微弧氧化工艺的研究", 《热加工工艺》 * |
| 黄丹: "硅酸盐体系下混合添加剂对铝合金微弧氧化膜层性能的影响", 《贵州大学硕士学位论文》 * |
| 黄鑫等: "纳米二氧化钛对铸造铝铜合金微弧氧化膜层性能的影响", 《电镀与涂饰》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108385150A (en) * | 2018-03-05 | 2018-08-10 | 中国人民解放军陆军装甲兵学院 | A kind of laminated film and preparation method thereof |
| CN108277516A (en) * | 2018-04-13 | 2018-07-13 | 中国人民解放军陆军装甲兵学院 | A kind of micro-arc oxidation electrolyte and a kind of preparation method of micro-arc oxidation films |
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Application publication date: 20171212 |