CN105506534B - A kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface - Google Patents
A kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface Download PDFInfo
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- CN105506534B CN105506534B CN201510992493.6A CN201510992493A CN105506534B CN 105506534 B CN105506534 B CN 105506534B CN 201510992493 A CN201510992493 A CN 201510992493A CN 105506534 B CN105506534 B CN 105506534B
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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 kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface.It mainly solves the problems, such as since existing aluminized coating spraying technology of preparing coating anti-corrosion capability is relatively low.The present invention includes：Mg alloy surface carries out blasting treatment, and the grain size of Al alloy powder ensures excellent mobility at 325~425 μm, and aluminized coating is prepared by the way of plasma spraying, and coating layer thickness controls between 0.05~0.3mm, and porosity controls below 3%；The aluminium glue body containing penetration-assisting agent is uniformly smeared on aluminized coating surface before heat treatment, in vacuum heat, control technological parameter is：410~430 DEG C of temperature, 90~150min of time form the transition zone of uniformly continuous between matrix and coating；Coating surface carries out alkali cleaning and pickling, coating surface chemical oxidation treatment, and surface is in the dark yellow of continuous uniform.The present invention has carried out corrosion resisting property corrective measure to coating, has improved whole magnesium alloy aluminized coating corrosion resistance, and ensure electric conductivity on the basis of obtained quality higher aluminized coating.
Description
Technical field
The invention belongs to Mg alloy surface process fields, more particularly about a kind of conductive energy of Mg alloy surface
Corrosion resistant aluminium preparation technology of coating.
Background technology
With miniaturization of electronic products, it is light-weighted require higher and higher, especially the fields such as aerospace, national defence make
Need its anti-corrosion and surface conductance with magnesium alloy, since magnesium alloy chemical lively type is high, poor corrosion resistance becomes magnesium alloy
The bottleneck of the application of large area strongly limits the application of magnesium alloy.Therefore, we devise face coat preparation process, will
Spraying aluminum coating on surface of magnesium alloy, and coating and basal body binding force are improved, corrosion resistance coating is promoted, so that Mg alloy surface is had anti-
Corrosive power and electric conductivity.
It improves Mg alloy surface anti-corrosion capability and has obtained extensive research, the main surface treatment method of magnesium alloy is at present
The method of differential arc oxidation, organic coating.Differential arc oxidation is that magnesia ceramics phase protective layer is made on surface, same as organic coating
All it is non-conductive protective layer.Metal-plated (painting) layer, which is one kind, preferably makes Mg alloy surface be provided simultaneously with anti-corrosion capability and conduction
The method of performance.With the fast development of plasma spraying technology, flame stream temperature is high, effluxvelocity is fast, can prepare high-quality
The coating of amount, it is small by workpiece shapes influence property to prepare aluminium alloy covered in this way, and coating is high with body associativity.Coating
Conductive energy, and certain mechanical processing can be carried out, workpiece size requirement and follow-up preservative treatment are not influenced.The technology
It develops into the Mg alloy surface preparation electrically conductive anti-corrosion coating of high quality and provides strong support.
However, in existing aluminized coating sprays preparation process, the binding force of coating and magnesium alloy substrate is relatively low, tool
There is the aluminium alloy covered thickness of certain anti-corrosion capability to be also required to reduce, meanwhile, the porosity of coating also has to be controlled and reduces, aluminium
The anti-corrosion capability of coating surface is also required to further increase, to promote the corrosion resistance of magnesium alloy coating.
Invention content
To solve the deficiency that above-mentioned existing aluminized coating sprays preparation process, the present invention provides a kind of Mg alloy surfaces to have
The corrosion resistant aluminium preparation technology of coating of electric conductivity, by being surface-treated to aluminized coating heat treatment and aluminized coating, to improve whole magnesium
Alloy aluminum corrosion resistance coating, and ensure electric conductivity.
To achieve the above object, the corrosion resistant aluminium preparation technology of coating of the conductive energy of a kind of Mg alloy surface, feature
It is to include the following steps：
Mg alloy surface is carried out blasting treatment by step S1；
Step S2, chooses Al alloy powder, and the Mg alloy surface by the way of thermal spraying after blasting treatment prepares aluminium
Coating；
Step S3 is placed be heat-treated in a vacuum furnace later in the uniform coated with aluminum colloid in aluminized coating surface；
Step S4 after heat treatment, first cleans aluminized coating；
After cleaning, chemical oxidation treatment is carried out to aluminized coating surface by step S5；
Complete the preparation of the anti-corrosion aluminized coating of the conductive energy of Mg alloy surface.
Preferably, the grain size of the Al alloy powder in step S2 is at 325~425 μm.
Preferably, in step S2 the thickness of aluminized coating between 0.05~0.3mm.
Preferably, thermal jet is painted with plasma spraying in step S2, and plasma spraying coating porosity controls below 3%.
Preferably, aluminium glue body is the aluminium glue body containing penetration-assisting agent in step S3.
Preferably, in step S3, the technological parameter of vacuum heat is：410~430 DEG C of temperature, 90~150min of time.
Preferably, the cleaning in step S4 is specially：The residue of aluminium glue body is first washed off, then carries out alkali cleaning and pickling.
Compared with the prior art, the present invention has the following advantages：
(1) present invention has carried out corrosion resisting property improvement on the basis that plasma spraying prepares anti-corrosion aluminized coating to coating
Measure improves the anti-corrosion capability of the binding force and aluminized coating surface of coating and magnesium alloy substrate, effectively reduces aluminized coating thickness
Degree, is effectively guaranteed the electric conductivity of aluminized coating, is lifted at the anti-corrosion capability that Mg alloy surface prepares aluminized coating.
(2) the corrosion resisting property corrective measure taken of the present invention includes：Corrosion resistant aluminium is being made using the mode of plasma spraying
After coating, workpiece surface is uniformly smeared to the aluminium glue body containing penetration-assisting agent, is heat-treated, the mistake between coating and matrix is made
Layer is crossed, its binding force is improved, while coating porosity is reduced by heat treatment, promotes coating quality；By aluminized coating surface chemistry
Oxidation processes enhance the anti-corrosion capability of coating itself, while not influencing the electric conductivity of coating again.
Description of the drawings
Fig. 1 is the flow chart of preparation process of the present invention.
Specific implementation mode
Below in conjunction with Fig. 1 and embodiment, the invention will be further described.
The present invention prepares aluminized coating using plasma spray coating process, on the basis of obtained quality higher aluminized coating, and
Corrosion resisting property corrective measure is carried out to aluminized coating, corrective measure includes：Aluminized coating is heat-treated and to aluminized coating surface chemistry
Oxidation.This method effectively raises the anti-corrosion capability of the binding force and aluminized coating surface of coating and magnesium alloy substrate, effectively drops
Low aluminized coating thickness, is effectively guaranteed the electric conductivity of aluminized coating, is lifted at Mg alloy surface and prepares the anti-corrosion of aluminized coating
Ability.Embodiment is as follows：
A kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface, it is characterised in that including following step
Suddenly：
Mg alloy surface is carried out blasting treatment by step S1.
Step S2 chooses Al alloy powder, the Mg alloy surface system by the way of plasma spraying after blasting treatment
Standby aluminized coating；Since the improvement and promotion of corrosion resistance coating energy are all to be carried out in the case where aluminized coating is superior in quality, therefore spray
Required raw material aluminium powder will ensure particle size range and excellent mobility, at the same control coating porosity and thickness it is uniform
Property.To when corrosion resisting property is improved, there is preferable anti-corrosion capability to ensure coating.
In embodiment, the grain size of the Al alloy powder in step S2 at 325~425 μm, the thickness of aluminized coating 0.05~
Between 0.3mm.
In embodiment, thermal jet is painted with plasma spraying in step S2, the control of plasma spraying coating porosity 3% with
Under.
Step S3 is placed be heat-treated in a vacuum furnace later in the uniform coated with aluminum colloid in aluminized coating surface；It is applied in aluminium
Layer surface uniformly smears the aluminium glue body containing penetration-assisting agent, is while to promote aluminium to ensure to effectively reduce aluminized coating porosity
The quick formation of coating and magnesium matrix intermediate layer.In a vacuum furnace be heat-treated after, should ensure that the continuous of intermediate layer and
Uniformity, to obtain the aluminized coating that there is good combination power with matrix.
In embodiment, aluminium glue body is the aluminium glue body containing penetration-assisting agent in step S3.The technological parameter of vacuum heat is：Temperature
410~430 DEG C of degree, 90~150min of time.
In embodiment, after being heat-treated in step S3, the transition zone of uniformly continuous is formd between matrix and coating.
Step S4 after heat treatment, first cleans aluminized coating.
In embodiment, the cleaning in step S4 is specially：The residue of aluminium glue body is first washed off, then carries out alkali cleaning and pickling.
In embodiment, control scavenging period and temperature are needed in step S4.
After cleaning, chemical oxidation treatment is carried out to aluminized coating surface by step S5.
In embodiment, after step S5 floating coat surface chemistry oxidation processes, surface is in the dark yellow of continuous uniform, is complete
Oxidation film.
Complete the preparation of the anti-corrosion aluminized coating of the conductive energy of Mg alloy surface.
Hereinafter most highly preferred embodiment of the invention will be provided in conjunction with attached drawing on the basis of the above embodiments：Mg alloy surface
The corrosion resistant aluminium preparation technology of coating of conductive energy.
Step S1, by Mg alloy surface blasting treatment, rear surface uniform color is shone in spray.
Step S2 chooses grain size at 375 μm or so, and the preferable Al alloy powder of mobility is as dusty spray.In magnesium
Alloy surface plasma spraying prepares aluminized coating, and coating porosity is controlled in 2% or so, coating layer thickness 0.2mm, and thickness difference
Value is within 0.02mm.
Step S3, aluminized coating surface, which is uniformly smeared, contains aluminium glue body of the polyethylene glycol as penetration-assisting agent.In a vacuum furnace into
Row heat treatment, parameter are：420 DEG C of temperature, time 120min.Coating is cleaned using polyethylene glycol after the completion of processing.
Step S4 carries out alkali cleaning and pickling.Alkali cleaning is：Be placed in concentration 50g/L, 55 DEG C of temperature sodium hydroxide solution in,
Time is 30s；Pickling is：It immerses in the salpeter solution of a concentration of 500mL/L, time 5s.
Step S5, the oxidation of aluminized coating surface chemistry.It is placed in oxidation recipes solution, temperature is 40 DEG C, time 25s.
The purpose of the present invention, scheme and advantage is described in detail in particular embodiments described above, and this field is general
Logical technical staff is appreciated that：The preferred example that the above is only the present invention, to illustrate technical scheme of the present invention, without
Constitute any limitation of the invention；Although present invention has been described in detail with reference to the aforementioned embodiments.This field
Those of ordinary skill should understand that：It still can be with technical scheme described in the above embodiments is modified or right
Which part or all technical features carry out equivalent replacement；And these modifications or replacements, do not make corresponding technical solution
Essence is detached from the scope of the claims in the present invention.
Claims (4)
1. a kind of corrosion resistant aluminium preparation technology of coating of the conductive energy of Mg alloy surface, it is characterised in that include the following steps：
Mg alloy surface is carried out blasting treatment by step S1；
Step S2, chooses Al alloy powder, and the Mg alloy surface by the way of thermal spraying after blasting treatment prepares aluminized coating；
The grain size of Al alloy powder is at 325 ~ 425 μm, and the thickness of aluminized coating is between 0.05 ~ 0.3mm；
Step S3 is placed be heat-treated in a vacuum furnace later in the uniform coated with aluminum colloid in aluminized coating surface；Vacuum heat
Technological parameter be：410 ~ 430 DEG C of temperature, 90 ~ 150min of time；
Step S4 after heat treatment, first cleans aluminized coating；
After cleaning, chemical oxidation treatment is carried out to aluminized coating surface by step S5；
Complete the preparation of the anti-corrosion aluminized coating of the conductive energy of Mg alloy surface.
2. technique according to claim 1, it is characterised in that：Thermal jet is painted with plasma spraying, plasma spray in step S2
Coating layer porosity controls below 3%.
3. technique according to claim 1, it is characterised in that：Aluminium glue body is the aluminium glue body containing penetration-assisting agent in step S3.
4. technique according to claim 1, it is characterised in that：Cleaning in step S4 is specially：First wash off aluminium glue body
Residue, then carry out alkali cleaning and pickling.
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| 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 |
| 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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| CN1281778C (en) * | 2004-04-15 | 2006-10-25 | 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 |
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