CN105506534A - Preparation process for corrosion-resistant aluminum coating with conductive performance on magnesium alloy surface - Google Patents
Preparation process for corrosion-resistant aluminum coating with conductive performance on magnesium alloy surface Download PDFInfo
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- CN105506534A CN105506534A CN201510992493.6A CN201510992493A CN105506534A CN 105506534 A CN105506534 A CN 105506534A CN 201510992493 A CN201510992493 A CN 201510992493A CN 105506534 A CN105506534 A CN 105506534A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
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Abstract
The invention discloses a preparation process for a corrosion-resistant aluminum coating with conductive performance on a magnesium alloy surface, and the preparation process is mainly used for solving the problem that a coating prepared by a current aluminum coating spraying preparation technology is relatively low in corrosion resistance. The preparation process comprises the following steps: carrying out sand blasting treatment on the aluminum alloy surface; selecting aluminum alloy powder, wherein the grain size of the aluminum alloy powder is 325-425 mu m, excellent mobility is guaranteed, an aluminum coating is prepared by adopting a plasma spraying mode, the thickness of the coating is controlled within 0.05-0.3mm, and porosity is controlled to be lower than 3%; uniformly coating an aluminum colloid containing a permeation-promoter on the surface of the aluminum coating before thermal treatment, and then carrying out vacuum thermal treatment on the aluminum colloid, wherein process parameters are controlled as follows: a temperature of 410-430 DEG C, time of 90-150 minutes, and a uniform and continuous transition layer is formed between a basal body and the coating; and carrying out alkaline washing and acid washing on the surface of the coating, carrying out chemical oxidization treatment on the surface of the coating, wherein the surface of the coating is in continuous and uniform dark yellow. According to the preparation process, on the basis of preparing the aluminum coating with relatively high quality, improvement measures for corrosion resistance are carried out on the coating, so that the corrosion resistance of the integral aluminum alloy aluminum coating is improved, and the conductive performance is guaranteed.
Description
Technical field
The invention belongs to Mg alloy surface process field, more particularly there is about a kind of Mg alloy surface the anticorodal aluminum preparation technology of coating of conductivity.
Background technology
Along with miniaturization of electronic products, light-weighted requirement are more and more higher, particularly the field such as aerospace, national defence needs its anti-corrosion and surface conduction at use magnesium alloy, because magnesium alloy chemical lively type is high, corrosion-resistant, become the bottleneck of the large-area application of magnesium alloy, strongly limit the application of magnesium alloy.Therefore, we devise top coat preparation technology, by spraying aluminum coating on surface of magnesium alloy, and improve coatings and substrate bonding force, promote corrosion resistance coating, make Mg alloy surface possess anti-corrosion capability and conductivity.
Improve Mg alloy surface anti-corrosion capability to obtain and studies widely, the main surface treatment method of current magnesium alloy is the method for differential arc oxidation, organic coating.Differential arc oxidation obtains magnesia ceramics phase protective layer, and same with organic coating is all non-conductive protective layer.Metal-plated (painting) layer is a kind of method preferably making Mg alloy surface simultaneously possess anti-corrosion capability and conductivity.Along with the fast development of plasma spraying technology, its flame stream temperature is high, jet speed is fast, can prepare high-quality coating, adopts that to prepare aluminium alloy covered in this way little by workpiece shapes impact property, coating and body associativity high.Coating has conductivity, and can carry out certain mechanical workout, does not affect workpiece size requirement and follow-up rotproofing.The Mg alloy surface that develops into of this technology is prepared high quality and can be conducted electricity anti-corrosion coating and provide strong support.
But, in existing aluminum coating spraying preparation technology, the bonding force of coating and magnesium alloy substrate is relatively low, the aluminium alloy covered thickness with certain anti-corrosion capability also needs to reduce, simultaneously, the porosity of coating also has to be controlled and reduces, and the anti-corrosion capability on aluminum coating surface also needs further raising, to promote the solidity to corrosion of magnesium alloy coating.
Summary of the invention
For solving the deficiency of above-mentioned existing aluminum coating spraying preparation technology, the invention provides the anticorodal aluminum preparation technology of coating that a kind of Mg alloy surface has conductivity, by to aluminum coating thermal treatment and aluminum coating surface treatment, to improve overall magnesium alloy aluminum coating solidity to corrosion, and ensure conductivity.
For achieving the above object, a kind of Mg alloy surface has the anticorodal aluminum preparation technology of coating of conductivity, it is characterized in that comprising the following steps:
Step S1, carries out sandblasting by Mg alloy surface;
Step S2, chooses Al alloy powder, adopts the Mg alloy surface of mode after sandblasting of thermospray to prepare aluminum coating;
Step S3, at aluminum coating surface uniform coated with aluminum colloid, places afterwards and heat-treats in a vacuum furnace;
Step S4, after thermal treatment, first cleans aluminum coating;
Step S5, after cleaning, carries out chemical oxidation treatment to aluminum coating surface;
Complete the preparation that Mg alloy surface has the anticorodal aluminum coating of conductivity.
Preferably, the particle diameter of the Al alloy powder in step S2 is at 325 ~ 425 μm.
Preferably, in step S2 the thickness of aluminum coating between 0.05 ~ 0.3mm.
Preferably, in step S2, thermospray is plasma spraying, and plasma spraying coating porosity controls below 3%.
Preferably, in step S3, aluminium glue body is the aluminium glue body containing penetration-assisting agent.
Preferably, in step S3, the processing parameter of vacuum heat treatment is: temperature 410 ~ 430 DEG C, time 90 ~ 150min.
Preferably, the cleaning in step S4 is specially: the resistates first washing aluminium glue body off, then carries out alkali cleaning and pickling.
The present invention compared with prior art has the following advantages:
(1) on the basis that the present invention prepares anticorodal aluminum coating at plasma spraying, corrosion resisting property innovative approach has been carried out to coating, improve the bonding force of coating and magnesium alloy substrate and the anti-corrosion capability on aluminum coating surface, effectively reduce aluminum coating thickness, effectively ensure that the conductivity of aluminum coating, be lifted at the anti-corrosion capability that Mg alloy surface prepares aluminum coating.
(2) the corrosion resisting property innovative approach that the present invention takes comprises: after the mode of use plasma spraying obtains anticorodal aluminum coating, workpiece surface uniform application is contained the aluminium glue body of penetration-assisting agent, heat-treat, transition layer between obtained coatings and substrate, improve its bonding force, reduce coating porosity by thermal treatment simultaneously, promote coating quality; By aluminum coating surface chemistry oxide treatment, enhance the anti-corrosion capability of coating self, do not affect again the conductivity of coating simultaneously.
Accompanying drawing explanation
Fig. 1 is the schema of preparation technology of the present invention.
Embodiment
Below in conjunction with Fig. 1 and embodiment, the invention will be further described.
The present invention uses plasma spray coating process to prepare aluminum coating, and on the basis of the higher aluminum coating of obtained quality, and carried out corrosion resisting property innovative approach to aluminum coating, innovative approach comprises: be oxidized to aluminum coating thermal treatment with to aluminum coating surface chemistry.The method effectively raises the bonding force of coating and magnesium alloy substrate and the anti-corrosion capability on aluminum coating surface, effectively reduces aluminum coating thickness, effectively ensure that the conductivity of aluminum coating, be lifted at the anti-corrosion capability that Mg alloy surface prepares aluminum coating.Embodiment is as follows:
Mg alloy surface has an anticorodal aluminum preparation technology of coating for conductivity, it is characterized in that comprising the following steps:
Step S1, carries out sandblasting by Mg alloy surface.
Step S2, chooses Al alloy powder, adopts the Mg alloy surface of mode after sandblasting of plasma spraying to prepare aluminum coating; Due to corrosion resistance coating can improvement and promote be all carry out when aluminum coating is superior in quality, therefore spraying needed for starting material aluminium powder form to guarantee particle size range and excellent mobility, control porosity and the thickness evenness of coating simultaneously.To when corrosion resisting property is improved, good anti-corrosion capability is had to ensure to coating.
In embodiment, the particle diameter of the Al alloy powder in step S2 is at 325 ~ 425 μm, and the thickness of aluminum coating is between 0.05 ~ 0.3mm.
In embodiment, in step S2, thermospray is plasma spraying, and plasma spraying coating porosity controls below 3%.
Step S3, at aluminum coating surface uniform coated with aluminum colloid, places afterwards and heat-treats in a vacuum furnace; Smearing the aluminium glue body containing penetration-assisting agent at aluminum coating surface uniform, is effectively reduce aluminum coating porosity to ensure, promotes the quick formation of aluminum coating and magnesium matrix intermediate layer simultaneously.In a vacuum furnace after thermal treatment, the continuous of intermediate layer and homogeneity should be ensured, to obtain the aluminum coating with matrix with good combination power.
In embodiment, in step S3, aluminium glue body is the aluminium glue body containing penetration-assisting agent.The processing parameter of vacuum heat treatment is: temperature 410 ~ 430 DEG C, time 90 ~ 150min.
In embodiment, in step S3 after thermal treatment, between matrix and coating, define the transition layer of uniformly continous.
Step S4, after thermal treatment, first cleans aluminum coating.
In embodiment, the cleaning in step S4 is specially: the resistates first washing aluminium glue body off, then carries out alkali cleaning and pickling.
In embodiment, need in step S4 to control scavenging period and temperature.
Step S5, after cleaning, carries out chemical oxidation treatment to aluminum coating surface.
In embodiment, after step S5 floating coat surface chemistry oxide treatment, the dark yellow of surface in continuous uniform is intact oxidised film.
Complete the preparation that Mg alloy surface has the anticorodal aluminum coating of conductivity.
Below by the basis of above-described embodiment, provide optimum embodiment of the present invention by reference to the accompanying drawings: Mg alloy surface has the anticorodal aluminum preparation technology of coating of conductivity.
Step S1, by Mg alloy surface sandblasting, rear surface uniform color is shone in spray.
Step S2, chooses particle diameter at about 375 μm, and the good Al alloy powder of mobility is as dusty spray.Prepare aluminum coating at Mg alloy surface plasma spraying, coating porosity controls about 2%, and coat-thickness is 0.2mm, and thickness difference is within 0.02mm.
Step S3, aluminum coating surface uniform is smeared containing the aluminium glue body of polyoxyethylene glycol as penetration-assisting agent.Heat-treat in a vacuum furnace, parameter is: temperature 420 DEG C, time 120min.Process rear use polyoxyethylene glycol to clean coating.
Step S4, carries out alkali cleaning and pickling.Alkali cleaning is: insert in the sodium hydroxide solution of concentration 50g/L, temperature 55 DEG C, the time is 30s; Pickling is: immersing concentration is in the salpeter solution of 500mL/L, and the time is 5s.
Step S5, aluminum coating surface chemistry is oxidized.Insert in oxidation recipes solution, temperature is 40 DEG C, and the time is 25s.
Above-described specific embodiment, object of the present invention, scheme and advantage have been described in detail, one of ordinary skill in the art will appreciate that: be only a preferred example of the present invention above, in order to technical scheme of the present invention to be described, and do not form any limitation of the invention; Although with reference to foregoing embodiments to invention has been detailed description.Those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of the claims in the present invention.
Claims (7)
1. Mg alloy surface has an anticorodal aluminum preparation technology of coating for conductivity, it is characterized in that comprising the following steps:
Step S1, carries out sandblasting by Mg alloy surface;
Step S2, chooses Al alloy powder, adopts the Mg alloy surface of mode after sandblasting of thermospray to prepare aluminum coating;
Step S3, at aluminum coating surface uniform coated with aluminum colloid, places afterwards and heat-treats in a vacuum furnace;
Step S4, after thermal treatment, first cleans aluminum coating;
Step S5, after cleaning, carries out chemical oxidation treatment to aluminum coating surface;
Complete the preparation that Mg alloy surface has the anticorodal aluminum coating of conductivity.
2. technique according to claim 1, is characterized in that: the particle diameter of the Al alloy powder in step S2 is at 325 ~ 425 μm.
3. technique according to claim 1, is characterized in that: in step S2, the thickness of aluminum coating is between 0.05 ~ 0.3mm.
4. technique according to claim 1, is characterized in that: in step S2, thermospray is plasma spraying, and plasma spraying coating porosity controls below 3%.
5. technique according to claim 1, is characterized in that: in step S3, aluminium glue body is the aluminium glue body containing penetration-assisting agent.
6. technique according to claim 1, is characterized in that: in step S3, and the processing parameter of vacuum heat treatment is: temperature 410 ~ 430 DEG C, time 90 ~ 150min.
7. technique according to claim 1, is characterized in that: the cleaning in step S4 is specially: the resistates first washing aluminium glue body off, then carries out alkali cleaning and pickling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510992493.6A CN105506534B (en) | 2015-12-25 | 2015-12-25 | A kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface |
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| CN201510992493.6A CN105506534B (en) | 2015-12-25 | 2015-12-25 | A kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface |
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| CN105506534B CN105506534B (en) | 2018-09-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216212A (en) * | 2016-07-27 | 2016-12-14 | 王虹 | The preparation technology of anti-bacteria stainless steel |
| CN106216213A (en) * | 2016-07-27 | 2016-12-14 | 王虹 | The method strengthening stainless antibiotic property |
| CN112663008A (en) * | 2020-11-30 | 2021-04-16 | 江苏理工学院 | Method for preparing magnesium-aluminum composite board by utilizing radio frequency magnetic control |
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| JP2001172795A (en) * | 1999-12-14 | 2001-06-26 | Ulvac Kyushu Corp | Aluminum composite and method for surface-treating aluminum composite |
| CN1563473A (en) * | 2004-04-15 | 2005-01-12 | 兰州理工大学 | Method in use for treating surface of workpiece in magnesium alloy |
| CN1931795A (en) * | 2006-09-07 | 2007-03-21 | 武汉理工大学 | Hole sealing moisture-proof anticorrosive composite coating material and its prepn process |
| CN101831652A (en) * | 2009-03-11 | 2010-09-15 | 中国科学院金属研究所 | Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy |
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2015
- 2015-12-25 CN CN201510992493.6A patent/CN105506534B/en active Active
Patent Citations (4)
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| JP2001172795A (en) * | 1999-12-14 | 2001-06-26 | Ulvac Kyushu Corp | Aluminum composite and method for surface-treating aluminum composite |
| CN1563473A (en) * | 2004-04-15 | 2005-01-12 | 兰州理工大学 | Method in use for treating surface of workpiece in magnesium alloy |
| CN1931795A (en) * | 2006-09-07 | 2007-03-21 | 武汉理工大学 | Hole sealing moisture-proof anticorrosive composite coating material and its prepn process |
| CN101831652A (en) * | 2009-03-11 | 2010-09-15 | 中国科学院金属研究所 | Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216212A (en) * | 2016-07-27 | 2016-12-14 | 王虹 | The preparation technology of anti-bacteria stainless steel |
| CN106216213A (en) * | 2016-07-27 | 2016-12-14 | 王虹 | The method strengthening stainless antibiotic property |
| CN112663008A (en) * | 2020-11-30 | 2021-04-16 | 江苏理工学院 | Method for preparing magnesium-aluminum composite board by utilizing radio frequency magnetic control |
| CN112663008B (en) * | 2020-11-30 | 2022-12-23 | 江苏理工学院 | Method for preparing magnesium-aluminum composite board by utilizing radio frequency magnetic control |
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