CN105256307A - Cold spraying manufacturing method for anticorrosive aluminum base or zinc-aluminum base metal coating on magnesium alloy surface - Google Patents
Cold spraying manufacturing method for anticorrosive aluminum base or zinc-aluminum base metal coating on magnesium alloy surface Download PDFInfo
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- CN105256307A CN105256307A CN201510746123.4A CN201510746123A CN105256307A CN 105256307 A CN105256307 A CN 105256307A CN 201510746123 A CN201510746123 A CN 201510746123A CN 105256307 A CN105256307 A CN 105256307A
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- 238000000576 coating method Methods 0.000 title claims abstract description 76
- 239000011248 coating agent Substances 0.000 title claims abstract description 75
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 58
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 51
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000010288 cold spraying Methods 0.000 title claims abstract description 35
- 229910000611 Zinc aluminium Inorganic materials 0.000 title claims abstract description 31
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000010953 base metal Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 230000007797 corrosion Effects 0.000 claims abstract description 40
- 238000005260 corrosion Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000011812 mixed powder Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims description 59
- 239000004411 aluminium Substances 0.000 claims description 36
- 238000002360 preparation method Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 18
- 239000000758 substrate Substances 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000011282 treatment Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 13
- 230000008021 deposition Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract 2
- 238000000151 deposition Methods 0.000 description 10
- 229910000619 316 stainless steel Inorganic materials 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010191 image analysis Methods 0.000 description 4
- 238000007747 plating Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- -1 before spraying Substances 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000010965 430 stainless steel Substances 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000013532 laser treatment Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C23C4/08—Metallic material containing only metal elements
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a cold spraying manufacturing method for an anticorrosive aluminum base or a zinc-aluminum base metal coating on a magnesium alloy surface and belongs to the field of the material surface engineering technology and mechanical manufacturing. The method includes the following steps that firstly, aluminum base or zinc-aluminum base metal powder is mixed with hard metal powder so as to manufacture mixed powder for cold spraying; and secondly, a cold spraying process is adopted, the mixed powder is sprayed to a pretreated magnesium alloy matrix, and the anticorrosive aluminum base or zinc-aluminum base metal coating is manufactured on the surface of the magnesium alloy matrix. By the adoption of the method, the grain speed and the deposition temperature do not need to be remarkably improved, operation is easy, a sedimentary body manufactured through the method is more excellent in electric conductivity and thermal conductivity and higher in corrosion resistance, abrasion resistance and mechanical performance, and therefore the method can be widely applied for manufacturing coatings with high electric conductivity, thermal conductivity, corrosion resistance and abrasion resistance or workpieces with the high mechanical performance.
Description
Technical field
The invention belongs to material surface engineering technolog and mechanical manufacturing field, be specifically related to the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of a kind of Mg alloy surface.
Background technology
Magnesium alloy, as structural metallic materials, has a lot of excellent performance: the low (1.8g/cm of density
3), be only 2/3 of aluminium, 1/4 of iron; Specific tenacity and specific rigidity large; Damping performance is good, can bear the shock load larger than aluminium alloy, be suitable for the part bearing high vibration; Matter is soft, Cutting free processing etc.These advantages of magnesium alloy make it obtain more application in fields such as aerospace, automotive industry, telecommunications, have extraordinary prospect.But as structured material, the poor etch resistant properties of magnesium alloy limits its use in a variety of contexts.
At present, the solidity to corrosion adopting surface reforming layer to improve magnesium alloy, as chemical conversion film, anodic oxidation treatment, various coating and coating, laser modified technology etc. more.Chemical conversion film is extensively used as japanning bottom, but research shows, chemical conversion film can only slowing down corrosion speed, effectively can not prevent corrosion, and normal containing heavy metal ion in plating solution, and preparation process causes certain pollution to environment; Anonizing is a kind of new surface treatment technologies of rising in recent years, can obtain wear-resistant, to have certain corrosion resistance nature coating, but the fragility of anode oxide film is comparatively large, porous, is difficult to obtain uniform oxide film; The metal plating of magnesium alloy generally adopts electro-plating method, but due to the potential pole of magnesium low, be not easy Direct precipitation resistant metal, and usually containing prussiate in plating solution, larger pollution existed to environment; Utilize thermospray in Mg alloy surface metal refining coating, as aluminum coating is prepared in thermospray, but in thermal spray process, can there is strong reaction in Mg alloy surface, makes Mg alloy surface oxidized, generates the oxide film that solidity to corrosion is very poor.In recent years, laser modified technology is widely used, but magnesium alloy is easily oxidized, evaporates and produces the problems such as vaporization, pore and thermal stresses when laser treatment.To sum up, still there is more problem in the existing method improving corrosion stability of magnesium alloy.
Cold spraying is a kind of high-speed impact by micro-meter scale particle under solid conditions, by particle and basal body interface or particle and the sub-interface of deposited particles is violent viscous deformation and the technology of formation of deposits coating.Lower technological temperature (fusing point lower than spray material) can avoid oxidation and the grain growth of metallics in spraying process, it also avoid simultaneously and cause heat affecting to magnesium alloy substrate, therefore cold spraying is the potential effective ways preparing high performance corrosion-proof metallic coating at Mg alloy surface.In producing, do not produce the waste liquid being rich in heavy metal ion, therefore relative to electrochemical method, cold spraying is a kind of green preparation technology of coating of relative environmental protection.
The compactness of coating is the most important factor affecting integrated member corrosion resistance nature except the attribute of material own.The compactness of cold spraying coating depends on the size of cold spraying particle amount of plastic deformation in Collision deposition process: amount of plastic deformation is larger, and the density of coating is higher, and erosion resistance is better.Current stage, the method improving cold spraying particles deform amount mainly contains two kinds:
1) kinetic energy when improving velocity of particle and then increase particle encounter;
2) temperature improving particle makes particle that significant softening occur.
Cold spraying Al alloy particle because of its density low, momentum and energy low, during high velocity impact deposition, mutual densification is weak, and the compactness of coating is lower.Usually, by increasing substantially velocity of particle further to improve coating compactness.But the speed significantly improving particle needs usually using the helium of costliness as acceleration gas (being about 50 times of nitrogen), and cost is high, limits industrial volume production.The temperature significantly improving particle will be that the metal transfer of these low melting points softens, and then is deposited on spray gun inwall, causes spray gun block, spraying process poor controllability, is difficult to continuous spray production.
Therefore, how low cost to realize aluminium base and the significantly improving of zinc-aluminium base corrosion-resistant finishes of Mg alloy surface be wait at present to solve important technological problems.
Summary of the invention
In order to overcome the defect that above-mentioned prior art exists, the object of the present invention is to provide the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of a kind of Mg alloy surface, the method is simple to operate, low for equipment requirements, and the coating obtained through the method has excellent corrosion resistance nature.
The present invention is achieved through the following technical solutions:
A cold spraying preparation method for the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface, comprises the following steps:
1) aluminium base or zinc-aluminium based metal powder are mixed with hard-particle powder, obtain the mixed powder for cold spraying;
2) adopt cold spray process, on pretreated magnesium alloy substrate, spraying mixed powder, obtain corrosion-resistant aluminium base or zinc-aluminium Base Metal coating at magnesium alloy matrix surface.
Described particle diameter that is aluminium base or zinc-aluminium based metal powder is 20 ~ 50 μm.
The particle diameter of described hard-particle powder is 150 ~ 500 μm.
Described hard-particle powder accounts for 20% ~ 80% of mixed powder cumulative volume.
Obtained after pretreated magnesium alloy base magnesium alloy substrate is carried out acetone ultrasonic cleaning and sand blasted surface roughening treatment.
The working gas adopted during spraying is nitrogen.
During spraying, gaseous tension is set as 0.8 ~ 4.0MPa; Gas temperature is 150 ~ 500 DEG C.
Described hard-particle powder is metal, alloy or ceramic particle.
Compared with prior art, the present invention has following useful technique effect:
The cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface disclosed by the invention, using the mixed powder of aluminium base or zinc-aluminium based metal powder and hard-particle powder as spray powders, cold spray process is adopted to prepare coating on pretreated magnesium alloy substrate, in the mixed powder of spraying hard macrobead to deposit aluminium base or Zinc and Aluminum Base Coating (in mixed powder hard particles due to particle diameter comparatively large so speed is slow, can not deposit, so the aluminium base and zinc-aluminium base particle that only will spray to some extent of deposition.Aluminium base and the deposition of zinc-aluminium base particle and the shock of hard particles and bounce-back occur in spraying process simultaneously, and hard particles can only clash into the aluminium base and Zinc and Aluminum Base Coating that deposits and can not to also having an impact at the particle of flight above.) effect of impact, make the particle firmly cold welding hole possible in seal coat together deposited in coating, thus the corrosive medium obtaining liquid state or gaseous state can not penetrate coating from coatingsurface reaches coating and basal body interface etched the matrix magnesium alloy.Compared with the coating of the same race prepared with conventional cold spray-coating method, the advantage of the inventive method is fairly obvious:
The first, adopt this kind of method to prepare the coating of aluminium base and zinc-aluminium Base Metal without through hole, can completely isolated corrosive medium, therefore show excellent corrosion resistance nature.
The second, the interface structure that the collision deformation of hard-particle powder to magnesium alloy substrate makes coating/basal body interface place formation bi-material be mutually locked, has increased substantially the bonding strength of coating and matrix, ensure that the permanent stability of use procedure floating coat.
3rd, the fatigue lifetime that the cold spraying of Mg alloy surface is aluminium base, Zinc and Aluminum Base Coating not only can not reduce matrix, residual compressive stress on the contrary owing to producing during particle hits Mg alloy surface matrix, effectively can improve the crack propagation resistance of matrix, significantly improve the fatigue lifetime of matrix.
4th, the present invention is without the need to adopting expensive helium as acceleration gas.Meanwhile, the temperature and pressure accelerating gas is all relatively low, therefore, can be realized by Portable type cold spraying equipment, and increased considerably the handiness of construction, coating manufacturing cost is also relatively low simultaneously.
The inventive method achieves the fine and close low cost that is aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface and prepares.Therefore, have broad application prospects in Corrosion Behaviors of Magnesium Alloys protection field.
Further, in dusty spray, hard-particle powder can be metal, alloy and ceramic particle, and only need hardness to be significantly greater than sprayed material, the viscous deformation therefore occurred in knockout process mainly concentrates on spray material, and then hole is disappeared.Hard-particle powder has larger particle diameter (>150 μm), make its impact velocity lower, depositing hardly when colliding lower than the critical velocity of cold spraying deposition under spraying conditions, the composition depositing the coated material caused due to hard particles can be avoided to change.
Accompanying drawing explanation
Fig. 1 is the pattern of aluminium powder and hard particles (316 stainless steel particle); A () is aluminium powder; B () is 316 stainless steel hard particles;
Fig. 2 is under identical parameters condition, the section structure of 1100Al coating prepared by conventional cold spraying and the inventive method; A () is ordinary method; B () is the inventive method;
Fig. 3 is different sample corrosion potentials curve over time in 3.5%NaCl solution
Fig. 4 is the polarization curve of different sample in 3.5%NaCl solution;
Fig. 5 is 1100Al coating/magnesium alloy basal body interface structure prepared by conventional cold spraying and the inventive method; A () is ordinary method; B () is the inventive method.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, it should be noted that, these embodiments are the present invention's preferably particles, understand the present invention for those skilled in the art, but the present invention is not limited to these embodiments.
The cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface disclosed by the invention, is implemented by following steps:
First, the aluminium base or zinc-aluminium based metal powder of 5-70 μm is mixed, using this kind of mixed powder as cold spraying dusty spray with Large stone (>150 μm) hard metal powders of certain proportion (10%-50%).
Secondly, cold spraying is adopted to prepare coating on magnesium alloy substrate after pretreatment.By hard macrobead in dusty spray to the effect of impact depositing aluminium base or Zinc and Aluminum Base Coating, the particle deposited in coating is made to close interparticle hole by cold welding and the dense coating formed without through hole, compared with the coating of the same race prepared with conventional cold spray-coating method, the coating adopting this kind of method to prepare is because having excellent corrosion resistance nature without through hole.
Embodiment 1
Using granularity between the 1100Al powder of 10-50 μm as spray material, using granularity between 316 stainless steel particles of 200-300 micron as hard particles.The hardness of 1100Al and 316 stainless steel hard is respectively about 25HV and 274HV.As shown in Figure 1, (a) is aluminium powder; B () is 316 stainless steel hard particles; 1100Al powder is spherical and ellipse spherical shapes, and 316 stainless steel hard particles are spherical shapes.Using the hard particles of 40vol.% and 1100Al powder mechanically mixing as dusty spray.Using AZ31 magnesium alloy as body material, before spraying, acetone ultrasonic cleaning and sand blasted surface roughening treatment are carried out to matrix.Using nitrogen as working gas, gaseous tension and gas temperature are set as 2.0MPa and 200 DEG C respectively.Control sample is the coating adopting pure 1100Al powder preparation under identical spray parameters.
The section structure of coating as shown in Figure 2.Can be found by (a) in Fig. 2, adopt in the coating of single 1100Al powder preparation and there is a large amount of hole, image analysis result shows, and coating porosity is up to 13.3%.In contrast to this, see in Fig. 2 (b), adopt the Al coat inside of mixed powder deposition not find obvious hole, the porosity of image analysis result display coating is only 0.3%.As can be seen here, compared with conventional cold spray process, adopt cold spray-coating method of the present invention significantly can reduce the porosity of aluminum base alloy coating.Change curve and polarization curve be respectively as shown in Figures 3 and 4 in time for four kinds of samples of 1100Al coating prepared by 1100Al bulk, ordinary method, 1100Al coating prepared by the inventive method and magnesium alloy substrate corrosion potential in 3.5%NaCl solution.Can find out; owing to there is a large amount of holes in 1100Al coating prepared by ordinary method, corrosive medium can arrive magnesium alloy matrix surface by these holes, therefore; the corrosion potential of 1100Al coating prepared by ordinary method and magnesium alloy substrate move closer to, and do not have provide protection.And it is fine and close to improve Al coating structure prepared by cold spray-coating method, effectively can isolate the contact of corrosive medium and magnesium alloy substrate, its corrosion potential and industrial pure Al bulk basically identical, corrosion resistance nature is very excellent.
After adding hard particles in powder, the bonding strength of pure Al coating increases substantially 51MPa by 24MPa.As shown in (a), (b) in Fig. 5, this mainly makes coating and matrix define interlaced, the sealed interface structure of two kinds of metals due to the collision deformation effect of hard particles to matrix, thus significantly enhances the bonding strength of matrix and coating.
Embodiment 2
Using granularity between the Zn5%Al powder of 15-50 μm as spray material, using granularity between 430 stainless steel particles of 150-300 micron as hard particles.Using the hard particles of 50vol.% and pure Al powder mechanically mixing as dusty spray.Using AZ31 magnesium alloy as body material, before spraying, acetone ultrasonic cleaning and sand blasted surface roughening treatment are carried out to matrix.Using nitrogen as working gas, gaseous tension and gas temperature are set as 1.8MPa and 250 DEG C respectively.Test result shows, adopts in the coating of single Zn5%Al powder preparation and there is a large amount of hole, and image analysis result shows, and coating porosity is up to 10.7%.Adopt the Zn5%Al coat inside of mixed powder deposition not find obvious hole, the porosity of image analysis result display coating is only 0.4%.Electrochemical results shows, the corrosion potential of Zn5%Al coating prepared by ordinary method and AZ31 magnesium alloy substrate move closer to, and do not have provide protection.And it is fine and close to improve Al coating structure prepared by cold spray-coating method, effectively can isolate the contact of corrosive medium and magnesium alloy substrate, its corrosion potential and ZnAl bulk basically identical, corrosion resistance nature is very excellent.
In sum, the present invention, under the prerequisite of low cost, realizes Mg alloy surface cold spraying deposition and prepares that the densification of the through through hole to coating/basal body interface of coatingsurface of having no way of of high bond strength is aluminium base, Zinc and Aluminum Base Coating.This invention is that Corrosion Behaviors of Magnesium Alloys protection provides a kind of new corrosion-resistant finishes preparation method.
Claims (8)
1. a cold spraying preparation method for the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface, is characterized in that, comprise the following steps:
1) aluminium base or zinc-aluminium based metal powder are mixed with hard-particle powder, obtain the mixed powder for cold spraying;
2) adopt cold spray process, on pretreated magnesium alloy substrate, spraying mixed powder, obtain corrosion-resistant aluminium base or zinc-aluminium Base Metal coating at magnesium alloy matrix surface.
2. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface according to claim 1, it is characterized in that, described particle diameter that is aluminium base or zinc-aluminium based metal powder is 20 ~ 50 μm.
3. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface according to claim 1, it is characterized in that, the particle diameter of described hard-particle powder is 150 ~ 500 μm.
4. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface according to claim 1, it is characterized in that, described hard-particle powder accounts for 20% ~ 80% of mixed powder cumulative volume.
5. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface according to claim 1, it is characterized in that, obtained after pretreated magnesium alloy base magnesium alloy substrate is carried out acetone ultrasonic cleaning and sand blasted surface roughening treatment.
6. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface according to claim 1, it is characterized in that, the working gas adopted during spraying is nitrogen.
7. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of the Mg alloy surface according to claim 1 or 6, it is characterized in that, during spraying, gaseous tension is set as 0.8 ~ 4.0MPa; Gas temperature is 150 ~ 500 DEG C.
8. the cold spraying preparation method of the corrosion-resistant aluminium base or zinc-aluminium Base Metal coating of Mg alloy surface according to claim 1, it is characterized in that, described hard-particle powder is metal, alloy or ceramic particle.
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| CN201510746123.4A CN105256307B (en) | 2015-11-05 | 2015-11-05 | The cold spraying preparation method of the corrosion-resistant aluminium base of Mg alloy surface or zinc-aluminium Base Metal coating |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107190260A (en) * | 2017-05-24 | 2017-09-22 | 中国船舶重工集团公司第七二五研究所 | A kind of anti-corrosion heat insulating coat system and preparation method thereof |
| CN107675163A (en) * | 2017-11-14 | 2018-02-09 | 北京科技大学 | The method that the pure zinc of Mg alloy surface/Zinc alloy coated is prepared based on cold spray technique |
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| CN115007848A (en) * | 2022-07-01 | 2022-09-06 | 长安大学 | Coating for retarding crevice corrosion of aluminum-copper connector and preparation method and application thereof |
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| CN108937604A (en) * | 2017-05-22 | 2018-12-07 | 佛山市顺德区美的电热电器制造有限公司 | Iron pan and preparation method thereof and cooking apparatus |
| CN107190260A (en) * | 2017-05-24 | 2017-09-22 | 中国船舶重工集团公司第七二五研究所 | A kind of anti-corrosion heat insulating coat system and preparation method thereof |
| CN109252154A (en) * | 2017-07-14 | 2019-01-22 | 中国科学院金属研究所 | The solution that spray gun blocks when cold spraying prepares aluminium and its alloy at high temperature |
| CN107675163A (en) * | 2017-11-14 | 2018-02-09 | 北京科技大学 | The method that the pure zinc of Mg alloy surface/Zinc alloy coated is prepared based on cold spray technique |
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| CN110616424A (en) * | 2019-08-30 | 2019-12-27 | 中国兵器科学研究院宁波分院 | Method for preparing corrosion-resistant wear-resistant aluminum-based amorphous composite coating by cold spraying technology |
| CN110976893A (en) * | 2019-12-27 | 2020-04-10 | 深圳市欣天科技股份有限公司 | Preparation method of composite metal layer on surface of ceramic substrate |
| CN110976893B (en) * | 2019-12-27 | 2022-05-20 | 深圳市欣天科技股份有限公司 | Preparation method of composite metal layer on surface of ceramic substrate |
| CN111926322A (en) * | 2020-06-24 | 2020-11-13 | 广东省新材料研究所 | Repairing method of magnesium-aluminum alloy structural part |
| CN113106437A (en) * | 2021-03-23 | 2021-07-13 | 武汉大学 | Ni-Mo-Al for preventing molten chloride corrosion2O3Metal coating and preparation method thereof |
| CN113088956A (en) * | 2021-04-14 | 2021-07-09 | 广东工业大学 | Cold spraying-based corrosion-resistant composite coating and preparation method and application thereof |
| CN113293345A (en) * | 2021-05-14 | 2021-08-24 | 东莞美景科技有限公司 | Plate and production method thereof |
| CN115007848A (en) * | 2022-07-01 | 2022-09-06 | 长安大学 | Coating for retarding crevice corrosion of aluminum-copper connector and preparation method and application thereof |
| CN115055677A (en) * | 2022-08-17 | 2022-09-16 | 潍坊谷合传动技术有限公司 | Method for preparing zinc-aluminum corrosion-resistant coating by cold spraying |
| CN115055677B (en) * | 2022-08-17 | 2022-11-01 | 潍坊谷合传动技术有限公司 | Method for preparing zinc-aluminum corrosion-resistant coating by cold spraying |
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