CN109652754A - A kind of preparation method of Mg alloy surface corrosion-inhibiting coating - Google Patents
A kind of preparation method of Mg alloy surface corrosion-inhibiting coating Download PDFInfo
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- CN109652754A CN109652754A CN201910110707.0A CN201910110707A CN109652754A CN 109652754 A CN109652754 A CN 109652754A CN 201910110707 A CN201910110707 A CN 201910110707A CN 109652754 A CN109652754 A CN 109652754A
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- magnesium alloy
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- inhibiting coating
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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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
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- Chemical Kinetics & Catalysis (AREA)
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- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention belongs to magnesium alloy technical field of anticorrosion.The present invention provides a kind of preparation method of Mg alloy surface corrosion-inhibiting coating, include the following steps: that (1) pre-processes magnesium alloy substrate；(2) step (1) pretreated magnesium alloy substrate is warming up to 60~100 DEG C, then the temperature for maintaining magnesium alloy substrate is 60~100 DEG C, with Fe-based amorphous alloy particle for coating to be painted, supersonic flame spraying is carried out in magnesium alloy matrix surface, obtains Fe-based amorphous alloy corrosion-inhibiting coating on the surface of magnesium alloy substrate.Preparation method provided by the present invention will not be such that magnesium alloy substrate deforms, and surface hardness reaches 580HV0.2, the corrosion potential of Fe-based amorphous alloy corrosion-inhibiting coating is higher than AZ91 magnesium alloy, and corrosion current density is lower than AZ91 magnesium alloy.
Description
Technical field
The present invention relates to magnesium alloy technical field of anticorrosion more particularly to a kind of preparation sides of Mg alloy surface corrosion-inhibiting coating
Method.
Background technique
In structural metallic materials, magnesium alloy is one of alloy of lighter weight, possesses lower density, is had good
Mechanical property, specific strength and specific stiffness with higher.Magnesium alloy also has a good stability of the dimension, and thermal conductivity is excellent etc.
Advantage, and it is very low to shape when casting structural member difficulty.Therefore the various aspects in industrial circle are all wide
General application, especially in aerospace, electronics etc. is paid close attention in fields.But itself corrosion resisting property and wearability of magnesium alloy
Can be excessively poor, it is impossible to meet the requirements of adverse circumstances, limit its application.
The method that magnesium alloy surface protective method mainly passes through electric arc spraying at present prepares pure aluminum coating in Mg alloy surface,
But since the energy of electric arc spraying is excessively high, will lead to magnesium alloy component and be deformed, and the hardness of aluminized coating is low, corrosion resistance
It can be relatively low.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation method of Mg alloy surface corrosion-inhibiting coating, preparations provided by the invention
Method will not be such that magnesium alloy substrate deforms, and surface anticorrosion coating hardness is big, excellent corrosion resistance.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of preparation methods of Mg alloy surface corrosion-inhibiting coating, include the following steps:
(1) magnesium alloy substrate is pre-processed；
(2) step (1) pretreated magnesium alloy substrate is warming up to 60~100 DEG C, then maintains magnesium alloy base
The temperature of body is 60~100 DEG C, with Fe-based amorphous alloy particle for coating to be painted, carries out supersonic speed fire in magnesium alloy matrix surface
Flame spraying, obtains Fe-based amorphous alloy corrosion-inhibiting coating on the surface of magnesium alloy substrate.
Preferably, the pretreatment includes cleaning, blasting treatment and the polishing successively carried out.
Preferably, the blasting treatment is that dry blasting is handled, and abrasive material used in the blasting treatment is the white fused alumina sand of 20#,
The pressure of the blasting treatment is 0.65MPa, and the speed of the blasting treatment is 0.5cm/s, and the time of the blasting treatment is
5min。
Preferably, the partial size of the Fe-based amorphous alloy particle is 250~300 mesh.
Preferably, the speed of the supersonic flame spraying is 15~25m/min, the supersonic flame spraying oxygen
Flow be 20~50m3/ h, the flow of the supersonic flame spraying fuel oil are 14~25L/h, the supersonic flame spray
The spray of painting is away from for 260~380mm.
Preferably, the fuel oil is kerosene.
Preferably, the powder sending quantity of the supersonic flame spraying is 20~50g/min.
Preferably, during the supersonic flame spraying, the temperature of magnesium alloy substrate is reduced by the way of air-cooled.
Preferably, the Fe-based amorphous alloy corrosion-inhibiting coating with a thickness of 300~600 μm.
The present invention provides a kind of preparation methods of Mg alloy surface corrosion-inhibiting coating, include the following steps: (1) by magnesium alloy
Matrix is pre-processed；(2) step (1) pretreated magnesium alloy substrate is warming up to 60~100 DEG C, then maintains magnesium
The temperature of alloy substrate is 60~100 DEG C, with Fe-based amorphous alloy particle for coating to be painted, is surpassed in magnesium alloy matrix surface
Velocity of sound flame-spraying obtains Fe-based amorphous alloy corrosion-inhibiting coating on the surface of magnesium alloy substrate.In the present invention, by magnesium alloy base
Body is warming up to 60~100 DEG C, and maintains magnesium alloy substrate within the said temperature range, sprays Fe-based amorphous alloy corrosion-inhibiting coating,
It can guarantee that magnesium alloy substrate is indeformable, while Fe-based amorphous alloy corrosion-inhibiting coating is able to maintain amorphous state, so that gained coating
Hardness with higher and excellent corrosion resistance.The experimental results showed that the preparation of corrosion-inhibiting coating provided by the present invention
Method will not be such that magnesium alloy substrate deforms, and surface hardness reaches 580HV0.2, and the self-corrosion electricity of Fe-based amorphous alloy corrosion-inhibiting coating
Position is higher than AZ91 magnesium alloy, and corrosion current density is lower than AZ91 magnesium alloy.
Detailed description of the invention
The cross-sectional morphology figure of 1 magnesium alloy substrate of the gained containing corrosion-inhibiting coating of Fig. 1 embodiment；
The XRD diagram of 1 gained Fe-based amorphous alloy corrosion-inhibiting coating of Fig. 2 embodiment；
The polarization curve of 1 gained Fe-based amorphous alloy corrosion-inhibiting coating of Fig. 3 AZ91 magnesium alloy substrate and embodiment.
Specific embodiment
The present invention provides a kind of preparation methods of Mg alloy surface corrosion-inhibiting coating, include the following steps:
(1) magnesium alloy substrate is pre-processed；
(2) step (1) pretreated magnesium alloy substrate is warming up to 60~100 DEG C, then maintains magnesium alloy base
The temperature of body is 60~100 DEG C, with Fe-based amorphous alloy particle for coating to be painted, carries out supersonic speed fire in magnesium alloy matrix surface
Flame spraying, obtains Fe-based amorphous alloy corrosion-inhibiting coating on the surface of magnesium alloy substrate.
The present invention pre-processes magnesium alloy substrate.
In the present invention, the pretreatment preferably includes the cleaning, blasting treatment and polishing that successively carry out.In the present invention
In, the cleaning in the preprocessing process can be by the oily waste degradation of magnesium alloy matrix surface, and blasting treatment can close magnesium
The oxide skin(coating) of golden matrix surface removes, and the solid particle that polishing leaves when can be by blasting treatment is removed completely, to obtain
Clean magnesium alloy substrate, to further increase the binding force between coating and matrix.
In the present invention, the cleaning is preferably cleaned by ultrasonic；The cleaning is preferably ethyl alcohol or acetone with cleaning agent.This
Invention is not particularly limited the intensity of the ultrasonic cleaning and time, and those skilled in the art can according to need selection.?
In the present invention, the cleaning can be by the oily waste degradation of magnesium alloy matrix surface.
In the present invention, the blasting treatment is preferably dry blasting processing；Abrasive material used in the blasting treatment is preferably 20#
White fused alumina sand；The pressure of the blasting treatment is preferably 0.65MPa；The speed of the blasting treatment is preferably 0.5cm/s；It is described
The time of blasting treatment is preferably 5min.
The present invention is not particularly limited the mode of the polishing, and those skilled in the art can fight each other according to the actual situation
The mode of mill is adjusted, and can clean out magnesium alloy matrix surface particle.In embodiments of the present invention, described to beat
Mill is preferably polished using steel brush.
In the present invention, the blasting treatment and polishing preferably carry out in 1~2h before being sprayed.In the present invention,
Oxide skin(coating) can be generated again to avoid spraying is preceding by carrying out blasting treatment and polishing to magnesium alloy substrate in 1~2h before spraying.
After the completion of pretreatment, the pretreated magnesium alloy substrate is warming up to 60~100 DEG C by the present invention, is then maintained
The temperature of magnesium alloy substrate is 60~100 DEG C, with Fe-based amorphous alloy particle for coating to be painted, is carried out in magnesium alloy matrix surface
Supersonic flame spraying obtains Fe-based amorphous alloy corrosion-inhibiting coating on the surface of magnesium alloy substrate.In the present invention, by magnesium alloy
Matrix is warming up to 60~100 DEG C, and maintains magnesium alloy substrate within the said temperature range, and spraying Fe-based amorphous alloy anti-corrosion applies
Layer, can guarantee that magnesium alloy substrate is indeformable, while Fe-based amorphous alloy corrosion-inhibiting coating is able to maintain amorphous state, so that gained applies
Layer hardness with higher and excellent corrosion resistance.
The present invention is not particularly limited the heating rate for being warming up to 60~100 DEG C, can be any heating rate.
In the present invention, the partial size of the Fe-based amorphous alloy particle is preferably 250~300 mesh.In the present invention, it is preferred to
The Fe-based amorphous alloy particle is first dried, is used further to spray, to enhance the mobility of powder.The present invention is to the drying
Mode is not particularly limited, and can obtain dry Fe-based amorphous alloy particle.In embodiments of the present invention, the drying
Preferably it is dried in vacuo；The temperature of the drying is preferably 100 DEG C；The time of the drying is preferably 1~3h.
In the present invention, the speed of the supersonic flame spraying is preferably 15~25m/min, more preferably 20~22m/
min；The flow of supersonic flame spraying oxygen is preferably 20~50m3/ h, more preferably 30~48m3/h；The Supersonic
The flow of fast flame-spraying fuel oil is preferably 14~25L/h, more preferably 16~20L/h；The supersonic flame spraying
Spray is away from preferably 260~380mm, more preferably 300~330mm.
The present invention is not particularly limited the time of the supersonic flame spraying, and those skilled in the art can be according to right
The thickness requirement of corrosion-inhibiting coating adjusts the time of supersonic flame spraying.In embodiments of the present invention, the Fe-based amorphous alloy
The thickness of corrosion-inhibiting coating is preferably 300~600 μm.
In the present invention, the fuel oil is preferably kerosene.
In the present invention, the powder sending quantity of the supersonic flame spraying is preferably 20~50g/min, more preferably 30~
40g/min。
In the present invention, during the supersonic flame spraying, it is preferred to use air-cooled mode reduces magnesium alloy substrate
Temperature.In the present invention, the air-cooled heating rate that can slow down magnesium alloy substrate is preferably to maintain magnesium alloy substrate
Temperature be 60~100 DEG C.
In the present invention, it is preferred to which the temperature for maintaining the magnesium alloy substrate with the following method is 60~100 DEG C: when magnesium closes
When the temperature of auri body reaches 100 DEG C, stopping supersonic flame spraying, the temperature to the magnesium alloy substrate is down to 60 DEG C, after
Continuous supersonic flame spraying.
It is detailed to a kind of preparation method progress of Mg alloy surface corrosion-inhibiting coating provided by the invention below with reference to embodiment
Explanation, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
(1) AZ91 magnesium alloy substrate is placed in ethyl alcohol and is cleaned by ultrasonic；
(2) the AZ91 magnesium alloy substrate after ultrasonic cleaning is carried out dry blasting processing, the blasting treatment by the 1h before spraying
Abrasive material used is 20# white fused alumina sand, and the pressure of the blasting treatment is 0.65MPa, and the speed of the blasting treatment is 0.5cm/
S, the time of the blasting treatment are 5min；
(3) dry blasting treated AZ91 magnesium alloy substrate surface is polished using steel brush clean, removes particulate matter, obtains
Clean AZ91 magnesium alloy substrate；
(4) vacuum condition by the Fe-based amorphous alloy particle of 250~300 mesh at 100 DEG C, dry 1h, obtains drying
Fe-based amorphous alloy particle；
(5) the AZ91 magnesium alloy substrate that step (3) obtains is fixed；By Fe-based amorphous alloy dry obtained by step (4)
Particle is packed into supersonic velocity flame plating equipment；
(6) AZ91 magnesium alloy substrate is warming up to 60 DEG C, carries out supersonic flame in the AZ91 magnesium alloy substrate surface
Spraying, at the same it is air-cooled to the progress of AZ91 magnesium alloy substrate, when the temperature of AZ91 magnesium alloy substrate reaches 100 DEG C, stop Supersonic
Fast flame-spraying continues supersonic flame spraying, so repeats when the temperature of AZ91 magnesium alloy substrate is down to 60 DEG C, until
The Fe-based amorphous alloy corrosion-inhibiting coating with a thickness of 500 μm is obtained in AZ91 magnesium alloy substrate surface；The supersonic flame spraying
Spray away from for 320mm, the flow of oxygen used is 48m3/ h, the flow of kerosene used are 16L/h, and spray gun length used is 5 English
Very little, the speed of supersonic flame spraying is 22m/min, powder sending quantity 35g/min.
The pattern of the cross section of magnesium alloy substrate containing corrosion-inhibiting coating obtained by the present embodiment is characterized, as a result as schemed
Shown in 1.As shown in Figure 1, corrosion-inhibiting coating (the i.e. Fe-based amorphous conjunction for the magnesium alloy substrate containing corrosion-inhibiting coating that the present embodiment obtains
Golden corrosion-inhibiting coating) it is well combined with substrate, coating is comparatively dense and at laminar structured, and gap is less.
Imagepro6 software detection is used to obtain the porosity of corrosion-inhibiting coating as 2.53%.
The self-corrosion electricity of Fe-based amorphous alloy corrosion-inhibiting coating obtained by the present embodiment is detected using electrochemical workstation method
Position is -0.7V, is higher than AZ91 magnesium alloy (- 1.58V).
The hardness of Fe-based amorphous alloy corrosion-inhibiting coating obtained by the present embodiment is tested using Vickers, up to
580HV0.2。
XRD characterization is carried out to the Fe-based amorphous alloy corrosion-inhibiting coating that the present embodiment obtains, as a result as shown in Figure 2.It can by Fig. 2
Know the steamed bun shape diffusing scattering peak of amorphous phase, and the not appearance of diffraction maximum all occur when 2 θ of the angle of diffraction is 44 ° or so,
Illustrate that Fe-based amorphous alloy corrosion-inhibiting coating has the amorphous microstructure of high level.It tests to obtain amorphous powder and gained through DSC
The heat release enthalpy of corrosion-inhibiting coating is calculated iron-based non-by formula Pcoating=Δ Hcoating/ Δ Hpowder × 100%
Amorphous microstructure content in peritectic alloy corrosion-inhibiting coating is 88.4%.
In the FeCl of 1mol/L2It is anti-that the Fe-based amorphous alloy that AZ91 magnesium alloy substrate and the present embodiment obtain is tested in solution
The polarization curve of rotten coating, as a result as shown in Figure 3.From the figure 3, it may be seen that Fe-based amorphous alloy is anti-relative to AZ91 magnesium alloy substrate
The corrosion potential of rotten coating is high, and passivation section is longer, and passivation characteristics are obvious, illustrate to generate in corrosion process stable
Passivating film, corrosion resistance are better than AZ91 magnesium alloy；In addition, Fe-based amorphous alloy corrosion-inhibiting coating corrosion current density will be lower than
AZ91 magnesium alloy, this illustrates that the speed of its corrosion is slower, and corrosion resistance is stronger.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of preparation method of Mg alloy surface corrosion-inhibiting coating, includes the following steps:
(1) magnesium alloy substrate is pre-processed；
(2) step (1) pretreated magnesium alloy substrate is warming up to 60~100 DEG C, then maintains magnesium alloy substrate
Temperature is 60~100 DEG C, with Fe-based amorphous alloy particle for coating to be painted, carries out supersonic flame spray in magnesium alloy matrix surface
It applies, obtains Fe-based amorphous alloy corrosion-inhibiting coating on the surface of magnesium alloy substrate.
2. preparation method according to claim 1, which is characterized in that the pretreatment includes the cleaning successively carried out, spray
Sand processing and polishing.
3. preparation method according to claim 2, which is characterized in that the blasting treatment is dry blasting processing, the spray
The white fused alumina sand that sand processing abrasive material used is 20#, the pressure of the blasting treatment are 0.65MPa, the speed of the blasting treatment
For 0.5cm/s, the time of the blasting treatment is 5min.
4. preparation method according to claim 1, which is characterized in that the partial size of the Fe-based amorphous alloy particle is 250
~300 mesh.
5. preparation method according to claim 1, which is characterized in that the speed of the supersonic flame spraying be 15~
25m/min, the flow of the supersonic flame spraying oxygen are 20~50m3/ h, the supersonic flame spraying fuel oil
Flow is 14~25L/h, and the spray of the supersonic flame spraying is away from for 260~380mm.
6. preparation method according to claim 5, which is characterized in that the fuel oil is kerosene.
7. according to claim 1 with 4~6 described in any item preparation methods, which is characterized in that the supersonic flame spraying
Powder sending quantity is 20~50g/min.
8. preparation method according to claim 1, which is characterized in that during the supersonic flame spraying, using wind
Cold mode reduces the temperature of magnesium alloy substrate.
9. preparation method according to claim 1, which is characterized in that the Fe-based amorphous alloy corrosion-inhibiting coating with a thickness of
300~600 μm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110144542A (en) * | 2019-06-21 | 2019-08-20 | 南昌航空大学 | A kind of preparation method of supersonic flame spraying system and iron-based amorphous coating |
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