CN110306181A - Mg alloy surface composite coating and preparation method thereof - Google Patents
Mg alloy surface composite coating and preparation method thereof Download PDFInfo
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- CN110306181A CN110306181A CN201910772228.5A CN201910772228A CN110306181A CN 110306181 A CN110306181 A CN 110306181A CN 201910772228 A CN201910772228 A CN 201910772228A CN 110306181 A CN110306181 A CN 110306181A
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
- C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/087—Coating with metal alloys or metal elements only
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
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Abstract
The invention belongs to Magnesiumalloy surface modifying technical fields, more particularly, to a kind of Mg alloy surface composite coating and preparation method thereof, Mg alloy surface composite coating, it is characterized by comprising the aluminum metal layer sprayed in magnesium alloy matrix surface using cold spray technique, using differential arc oxidization technique aluminum metal layer growth in situ arc differential oxide ceramic coating.The present invention is using cold spraying aluminium-differential arc oxidation complex technique preparation high-performance Al-MAO composite coating design, Al-MAO composite coating is shown than single pure aluminum coating, the better hardness number of MAO coating, the mechanical property and bearing capacity of matrix are significantly improved, can effectively improve magnesium alloy bearing capacity and anti-friction wear resistance, Al-MAO composite coating has higher hard bearing capacity and better anti-friction wear resistance, the friction and wear characteristic raising of matrix is become apparent, show better reliability and service life, the comprehensive performance that pure aluminum metal layer improves composite coating is introduced among matrix and MAO coating.
Description
Technical field
The invention belongs to Magnesiumalloy surface modifying technical field, more particularly, to a kind of Mg alloy surface composite coating and its
Preparation method.
Background technique
Magnesium alloy is the lightweight metal material of the generally acknowledged most future in the world today, have density is small, intensity than it is high, lead
Good, the excellent damping shock absorption of electrical conductivity and electromagnetic shielding, rich reserves are easy the series of advantages such as recycling, are known as 21
Century most promising green engineering material, just by gradually be applied to automobile manufacture, telecommunications, aerospace, weapon industry
Equal fields.However, the high chemical activity of magnesium alloy determines that its electrochemical corrosion resistant performance is poor；The soft of magnesium alloy is determined
It is weak to have determined its bearing capacity, has easily caused component surface wear-out failure.Therefore, its surface " abrasive damage " and " corruption how to be solved
Erosion failure " problem is the key technology difficulty faced in current Magnesium Alloy Industry application.
Research confirms that surface protection coating is the current effective way for improving Mg alloy surface wear and corrosion resistance.In
Plasma immersion ion injection is respectively adopted in state patent ZL100336937C, ZL102304745A and ZL101696488B
(PIII), the technologies such as differential arc oxidation (MAO) and low-temperature physics vapor deposition (PVD) are corroded to improve Mg alloy surface electrochemically resistant
And wear resistance.However single Magnesiumalloy surface modifying layer is still unable to reach long-term magnesium alloy surface protective effect.It is micro-
Arc oxidation (Micro-arc Oxidation) coating is to improve the anti-corrosion most effective plan with wear-resisting property of Mg alloy surface
Slightly, MAO coating can significantly improve the corrosion resistance and surface load-carrying properties of magnesium matrix and its alloy, be whole surface in recent years
The trend of guard technology.But MAO coating and basal body interface tensile stress state seriously affect its fatigue wear service life, coated porous
Micro-structure also easily induces corrosive medium basal body interface and spreads and lead to components corrosion degradation.
Summary of the invention
The object of the present invention is to provide a kind of Mg alloy surface for having both high-mechanic, antiwear and reducing friction and corrosion-resistant advantage is compound
Coating and preparation method thereof.
The purpose of the present invention is what is realized by following technical proposals:
Mg alloy surface composite coating of the invention, it is characterised in that sprayed including the use of cold spray technique in magnesium alloy matrix surface
The aluminum metal layer of painting, using differential arc oxidization technique the aluminum metal layer growth in situ arc differential oxide ceramic coating.
The aluminum metal layer is with a thickness of 300 μm -500 μm.
The arc differential oxide ceramic coating layer thickness is 8 μm -12 μm.
A kind of preparation method of Mg alloy surface composite coating, it is characterised in that include the following steps:
1) sample sanding and polishing is removed oxide on surface and pollutant, is cleaned sample ultrasonic with alcohol using abrasive paper for metallograph
It is dried for standby after 10min；
2) sample need to carry out blasting treatment before spraying, and sand size is 30 mesh；
3) metallic aluminum is equipped using low pressure supersonic spray coating, is not needed the metallic that will be sprayed fusing, is sprayed matrix surface
The temperature of generation is no more than 150 DEG C；
Main spray parameters are as follows: -400 mesh of 200 mesh of aluminum particle degree, voltage 220V, 0.7 Pa -0.9Pa of pressure.
4) arc differential oxide ceramic coating, arc differential oxide ceramic are grown in aluminum metal layer surface in situ using differential arc oxidization technique
Coating preparation process is as follows: reaction solution is sodium phosphate and sodium metasilicate, 4 A/dm of electric current2-6A/dm2, frequency 500Hz, when electric discharge
Between 180 μ s-220 μ s, arc differential oxide ceramic coating prepare deposition reaction time 35min-45min, arc differential oxide ceramic coating system
Solution temperature is maintained at 30 degree or less during standby.
Advantages of the present invention:
(1) Mg alloy surface composite coating and preparation method thereof of the invention, using cold spraying aluminium-differential arc oxidation complex technique system
Standby high-performance Al-MAO composite coating (cold spraying-differential arc oxidation gradient composite coating) designs, and Al-MAO composite coating is shown
Hardness number more better than single pure aluminum coating, MAO coating, the mechanical property and bearing capacity of matrix are significantly improved, can be with
The effective bearing capacity for improving magnesium alloy and anti-friction wear resistance, Al-MAO composite coating have higher hard carrying energy
Power and better anti-friction wear resistance become apparent the friction and wear characteristic raising of matrix, show better reliability
And service life, the comprehensive performance that pure aluminum metal layer improves composite coating is introduced among matrix and MAO coating；
(2) Mg alloy surface composite coating and preparation method thereof of the invention, single its corrosion resistance of MAO coating promotion have
Limit, cold spray pure aluminum coating significantly improve corrosion resistance, and Al-MAO composite coating shows more preferably corrosion protection effect；
(3) Mg alloy surface composite coating and preparation method thereof of the invention, Al-MAO composite coating are applied in magnesium matrix and MAO
The generation that cold spraying aluminum metal transition zone effectively avoids corrosive medium diffusion that from can effectively inhibiting galvanic corrosion is introduced between layer,
Show more preferably anti-erosion performance；
(4) Mg alloy surface composite coating and preparation method thereof of the invention, MAO coating have simultaneously excellent bearing capacity,
Anti-friction performance and corrosion resistance provide new thinking for the design of lightweight magnesium alloy surface High performance protective coating, close to magnesium
The engineer application of golden components has important impetus；
(5) Mg alloy surface composite coating and preparation method thereof of the invention, using introducing compression aluminum metal layer as corrosion
Media isolation barrier and stress buffer area reduce corrosive medium basal body interface and spread probability, alleviate coating interface tensile stress state,
Its surface abrasion and corrosion resistance are improved, and successfully constructs Al-MAO using cold spraying aluminium and differential arc oxidation complex technique and answers
Coating is closed, gained coating surface is smooth, consistency is high, and it is high with substrate combinating strength, and non-environmental-pollution；Composite coating
Step is simple, economical and practical, can be used for industrialized production.
Detailed description of the invention
Fig. 1 is the pure magnesium metal of the present invention and prepares functional coating surface microhardness.
Fig. 2 is the pure magnesium metal of the present invention and prepares functional coating friction curve (load -2N).
Fig. 3 is the pure magnesium metal of the present invention and prepares fretting wear scratch surface topography of the functional coating under 2N load.
Fig. 4 is the single MAO coating grinding defect morphology of the present invention and EDS map (load -2N).
Fig. 5 is Al-MAO composite coating grinding defect morphology of the present invention and EDS map (load -2N).
Fig. 6 is the pure magnesium metal of the present invention and prepares functional coating surface corrosion polarization curve.
Fig. 7 is the pure magnesium metal of the present invention and prepares functional coating surface corrosion pattern.
Fig. 8 is the pure magnesium metal of the present invention and prepares erosion corrosion curve (load-under the brine media environment of functional coating surface
2N).
Fig. 9 is the pure magnesium metal of the present invention and prepares functional coating surface abrasion corrosion grinding defect morphology (load -2N).
Figure 10 is the pure magnesium metal of the present invention and prepares functional coating erosion corrosion trace pattern and EDS map (load -2N).
W0(a in the figures above): pure magnesium metal；W1(b): pure Al coating；W2(c): MAO ceramic coating；W3(d): Al/
MAO composite coating.
Specific embodiment
A specific embodiment of the invention is further illustrated with reference to the accompanying drawing.
Mg alloy surface composite coating of the invention, it is characterised in that including the use of cold spray technique in magnesium alloy substrate table
Face spraying aluminum metal layer, using differential arc oxidization technique the aluminum metal layer growth in situ arc differential oxide ceramic coating.
Based on cold spraying aluminium-differential arc oxidation complex technique preparation high-performance Al-MAO composite coating design, first with cold spray technique
There are high speed impact energy in magnesium alloy matrix surface spraying raffinal metal layer, cold spray process, supercritical state is lured
It sends out the strong elastic-plastic deformation of aluminium gold metal particles and realizes fine and close combination, aluminum metal layer is well combined with magnesium alloy substrate.Foundation
Electrode potential phase approximately principle, aluminum metal layer can effectively obstruct corrosive medium, the coating failure for avoiding basal body interface degradation from inducing, and
The bed boundary MAO stress can be effectively relieved in cold spraying compressive stress state, improve its fatigue life；Secondly, utilizing differential arc oxidization technique
In the high chemical inertness of aluminum metal layer growth in situ and mechanical characteristic ceramic coating, acquisition Strengthening and Toughening is wear-resisting to imitate with corrosion-resistant protection
Fruit.
As a preference of the present invention, the aluminum metal layer is with a thickness of 300 μm -500 μm.
As a preference of the present invention, the arc differential oxide ceramic coating layer thickness is 8 μm -12 μm.
A kind of preparation method of Mg alloy surface composite coating, it is characterised in that include the following steps:
1) sample sanding and polishing is removed oxide on surface and pollutant, is cleaned sample ultrasonic with alcohol using abrasive paper for metallograph
It is dried for standby after 10min；
2) sample need to carry out blasting treatment before spraying, and sand size is 30 mesh；
3) metallic aluminum is equipped using low pressure supersonic spray coating, is not needed the metallic that will be sprayed fusing, is sprayed matrix surface
The temperature of generation is no more than 150 DEG C；
Main spray parameters are as follows: -400 mesh of 200 mesh of aluminum particle degree, voltage 220V, pressure 0.7Pa -0.9Pa.
4) arc differential oxide ceramic coating, arc differential oxide ceramic are grown in aluminum metal layer surface in situ using differential arc oxidization technique
Coating preparation process is as follows: reaction solution is sodium phosphate and sodium metasilicate, 4 A/dm of electric current2-6A/dm2, frequency 500Hz, when electric discharge
Between 180 μ s-220 μ s, arc differential oxide ceramic coating prepare deposition reaction time 35min-45min, arc differential oxide ceramic coating system
Solution temperature is maintained at 30 degree or less during standby.
Embodiment 1:
Following embodiment will disclose a kind of Mg alloy surface gradient composite coating, including bottom cold spraying middle layer, as corrosion
Media isolation barrier and stress buffer area, surface is using differential arc oxidization technique in the high chemical inertness of middle layer growth in situ and mechanics
It is wear-resisting with corrosion-resistant protection effect to obtain Strengthening and Toughening for characteristic ceramic coating.
As the preferred of Mg alloy surface gradient composite coating of the present invention, the bottom middle layer is cold spraying pure metallic aluminum
Layer, with a thickness of 300 μm -500 μm.
As the preferred of Mg alloy surface gradient composite coating of the present invention, the surface bearing bed is differential arc oxidation layer,
With a thickness of 8 μm -12 μm.
The method that the present embodiment prepares Mg alloy surface gradient composite coating, comprising the following steps:
A, cold spraying pure metal aluminium layer is prepared in situ in Mg alloy surface, comprising:
A) substrate prepares: taking pure magnesium metal, removes table using abrasive paper for metallograph sample sanding and polishing having a size of Φ 45mm × 6mm
Face oxide and pollutant are dried for standby after sample ultrasonic is cleaned 10min with alcohol；
B) blasting treatment: sample need to carry out blasting treatment, 30 mesh of sand size before spraying.
C) cold spraying aluminium: metallic aluminum is equipped using low pressure supersonic spray coating, does not need the metallic that will be sprayed fusing,
The temperature that spraying matrix surface generates does not exceed 150 DEG C generally；
The present embodiment is as follows using main cold spraying parameter: 300 mesh of high purity aluminum powder granularity, voltage 220V, pressure 0.8Pa.
B, differential arc oxidation bearing bed is prepared on cold spraying pure metal aluminium layer:
Ceramic coating is grown in aluminum metal layer surface in situ using differential arc oxidization technique, coating preparation process is as follows: reaction solution
For sodium phosphate and sodium metasilicate, electric current 5A/dm2, frequency 500Hz, 200 μ s of discharge time, coating preparation deposition reaction time
40min, solution temperature is maintained at 30 degree or less in coating preparation process.
Performance detection:
The fretting wear under hardness, friction curve, load is carried out to pure magnesium metal made from embodiment 1 and functional coating surface to draw
Erosion corrosion curve, abrasion under trace surface topography, grinding defect morphology, corrosion polarization curve, surface corrosion pattern, brine media environment
Corrode the performance detections such as grinding defect morphology, erosion corrosion pattern and EDS map, as a result as Figure 1-10 shows.
Wherein, the detection method of hardness is the Vickers hardness using HV-1000 type microhardness testers testing coating；Friction
Polishing machine detection uses MS-T3000 type friction wear testing machine, chooses diameter 6mmSi3N4Ceramic Balls friction is secondary, experimental test
Parameter are as follows: rotation speed 200 rap/min, rotating diameter 3mm, load-up condition 2N, friction testing time 60min；Erosion corrosion
Performance detection uses MFT-EC4000 Dynamic wear-electrochemical corrosion coupling test instrument；It is penetrated using X'Pert Powder type X-
Line diffractometer analyzes coating phase structure；Using Zeiss- Σ IGMAHD type field emission microscope observation coating surface and interface with
Fractography pattern, fretting wear, corrosion and the abrasion pattern of qualitative/semi-quantitative analysis coating；Using Keyemce optical microphotograph
Mirror VHX-600K observes Fine Texture of Material row structure and morphology and fretting wear, corrosion and abrasion.
As shown in Figure 1: pure magnesium matrix hardness is 51.8625HV；The hardness of pure aluminum coating is 88.4HV, and single MAO is applied
Layer hardness is 118.45HV；Al-MAO composite coating hardness is 130.275HV.
As shown in Figure 2: the coefficient of friction of pure magnesium matrix is about 0.55.The coefficient of friction of pure aluminum coating is 0.5, entire to rub
Process variation is very big, and friction process is not perfectly flat steady.There is the trend being gradually increasing at the beginning in single MAO coating friction, and
When friction is to 15min, coefficient of friction is up to 0.93, and coefficient of friction is mutated later, and coefficient of friction is presented decline and becomes after 20min
Gesture, friction are fluctuated, and show that coating has worn out failure.Compound Al-MAO coating friction process is always maintained at steady state,
Stable friction factor is 0.6, and showing coating, there is no wear-out failures.Described in synthesis, friction curve test result shows: compound
Al-MAO coating shows the lower coefficient of waste compared to single MAO coating, and the wearability of matrix is significantly improved.
As shown in Figure 3: pure Mg alloy surface wear scar width is 1680 μm；There is the sheet of aluminum metal in single pure aluminum coating trace ditch
Body brilliant white, wear scar width are about 1512 μm；Single MAO coating wear scar width is about 1130 μm；Compound Al-MAO coating phase
Than in single MAO coating, wear scar width is wider, about 1681 μm, apparent transition zone aluminium gold is not presented at polishing scratch zanjon
Belong to color, flawless.
As shown in Figure 4: worn-out surface EDS power spectrum shows the strong peak of Mg, Al element, and O constituent content is seldom, shows coating
Sharp wear fails.
As shown in Figure 5: worn-out surface EDS power spectrum proves that coating worn-out surface is mainly O, Al element, it was demonstrated that coating top layer
MAO layers there is no wear-out failures, illustrate to be prepared for compound Al-MAO coating in pure Mg alloy surface, the wearability of matrix obtains
It is obviously improved.
As shown in Figure 6: pure magnesium metal corrosion potential and electric current are respectively -1.52V and 9.21 × 10-3A/cm-2；It is single pure
Aluminized coating corrosion potential and electric current are respectively -1.31V and 2.17 × 10-4A/cm-2, in Mg alloy surface spray aluminum metal coating
Significantly improve its corrosion resisting property；Single MAO coating corrosion current potential and electric current are respectively -1.49V and 5.25 × 10-5A/cm-2；With
Single MAO coating is compared, and Al-MAO composite coating corrosion electric current density is increased slightly, but electrode potential is obvious with disruptive potential
Better than single MAO coating, corrosion potential and electric current are respectively -1.33V and 6.31 × 10-5A/cm-2。
As shown in Figure 7: heavy corrosion degradation occurs for pure magnesium metal base body, and there are a large amount of corrosion crackings and holes on surface；It is single
One pure aluminum coating shows good corrosion protection effect, and surface keeps complete pattern, is formed without obvious corrosion hole with crackle；
Single MAO and Al-MAO composite coating has splendid anticorrosive performance, and coating surface is smooth, corrosion-free defect (hole
Or crackle etc.) formed, show good corrosion resistance.
As shown in Figure 8: pure magnesium alloy, the average friction coefficient about 0.23 of corrosive medium environment lower substrate, matrix open circuit electricity
Position keeps stablizing；Single pure aluminum coating, average friction coefficient about 0.63, there are larger fluctuation amplitude, open circuit potential for coefficient of friction
Also it keeps stablizing；Single MAO coating, the average friction coefficient about 0.41 of single MAO coating, coating open circuit potential is in friction moment
There is inflection point and is substantially reduced；Al-MAO composite coating average friction coefficient about 0.22, open circuit potential tends to be steady.
As shown in Figure 9: about 600 μm of pure magnesium metal wear scar width, worn-out surface are distributed a large amount of catabolites, and polishing scratch edge is deposited
In seriously degradation hole；About 300 μm of the wear scar width of pure aluminum coating, worn-out surface keeps smooth；The wear scar width of MAO coating is about
150 μm, surface is smooth, coating wear-out failure not yet；The frictionally damage trace of Al-MAO composite coating is not significant, coating
Still maintain complete, about 120 μm of wear scar width, in addition, coating surface adheres to one layer of abrasive dust material for being different from coating material.
As shown in Figure 10: there is clearly micro-crack in pure magnesium metal worn-out surface, and power spectrum confirms that worn-out surface contains largely
Cl element, the corrosion degradation for showing that Cl ion induces are serious；Aluminium gold metal surface there are pears ditch effect caused by obvious frictionally damage,
But Cl ion concentration is substantially reduced, it was demonstrated that the advantage in terms of inhibiting Cl ion etching；MAO coating surface still maintains porous micro-
Structure, EDS atlas analysis confirm coating wear-out failure not yet；The worn-out surface of Al-MAO composite coating exists along frictional direction
Pears ditch, EDS map confirms that coating contains the Si element of high-content, and the composition analysis result of control coatings may infer that adhesion
Material resource is in grinding ball material.
Preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, in fact, matrix in the present invention
The type of magnesium alloy is not limited to pure magnesium metal, and also there is no limit for concrete shape and size；
Mg alloy surface composite coating of the invention and preparation method thereof is prepared using cold spraying aluminium-differential arc oxidation complex technique
High-performance Al-MAO composite coating (cold spraying-differential arc oxidation gradient composite coating) design, Al-MAO composite coating show to compare
Single pure aluminum coating, the better hardness number of MAO coating, the mechanical property and bearing capacity of matrix are significantly improved, Ke Yiyou
The bearing capacity and anti-friction wear resistance, Al-MAO composite coating of the raising magnesium alloy of effect have higher hard bearing capacity
With better anti-friction wear resistance, the friction and wear characteristic raising of matrix is become apparent, show better reliability and
Service life introduces the comprehensive performance that pure aluminum metal layer improves composite coating among matrix and MAO coating；Magnesium of the invention
Alloy surface composite coating and preparation method thereof, single its corrosion resistance of MAO coating promotion is limited, and cold spray pure aluminum coating is significant
Corrosion resistance is improved, Al-MAO composite coating shows more preferably corrosion protection effect；Al-MAO composite coating is in magnesium-based
Cold spraying aluminum metal transition zone is introduced between body and MAO coating effectively avoids corrosive medium diffusion that from can effectively inhibiting galvanic couple
The generation of corrosion shows more preferably anti-erosion performance；MAO coating has excellent bearing capacity, anti-friction performance simultaneously
And corrosion resistance, new thinking is provided for the design of lightweight magnesium alloy surface High performance protective coating, to Magnesium Alloys Components
Engineer application has important impetus；The present invention using introduce compression aluminum metal layer as corrosive medium transfer barrier and
Stress buffer area reduces corrosive medium basal body interface and spreads probability, alleviates coating interface tensile stress state, improve its abrasion-resistant surface
Damage and corrosion resistance, and Al-MAO composite coating is successfully constructed using cold spraying aluminium and differential arc oxidation complex technique, gained applies
Layer surface is smooth, consistency is high, high with substrate combinating strength, and non-environmental-pollution；Composite coating step is simple, economical
It is practical, it can be used for industrialized production.
Claims (4)
1. a kind of Mg alloy surface composite coating, it is characterised in that sprayed including the use of cold spray technique in magnesium alloy matrix surface
Aluminum metal layer, using differential arc oxidization technique the aluminum metal layer growth in situ arc differential oxide ceramic coating.
2. Mg alloy surface composite coating according to claim 1, it is characterised in that the aluminum metal layer is with a thickness of 300
μm -500μm。
3. Mg alloy surface composite coating according to claim 1, it is characterised in that the arc differential oxide ceramic coating
With a thickness of 8 μm -12 μm.
4. a kind of preparation method of Mg alloy surface composite coating, it is characterised in that include the following steps:
1) sample sanding and polishing is removed oxide on surface and pollutant, is cleaned sample ultrasonic with alcohol using abrasive paper for metallograph
It is dried for standby after 10min；
2) sample need to carry out blasting treatment before spraying, and sand size is 30 mesh；
3) metallic aluminum is equipped using low pressure supersonic spray coating, is not needed the metallic that will be sprayed fusing, is sprayed matrix surface
The temperature of generation is no more than 150 DEG C；
Main spray parameters are as follows: -400 mesh of 200 mesh of aluminum particle degree, voltage 220V, 0.7 Pa -0.9Pa of pressure；
4) arc differential oxide ceramic coating, arc differential oxide ceramic coating are grown in aluminum metal layer surface in situ using differential arc oxidization technique
Preparation process is as follows: reaction solution is sodium phosphate and sodium metasilicate, 4 A/dm of electric current2-6A/dm2, frequency 500Hz, discharge time
180 μ s-220 μ s, arc differential oxide ceramic coating prepare deposition reaction time 35min-45min, the preparation of arc differential oxide ceramic coating
Solution temperature is maintained at 30 degree or less in the process.
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| CN110923695A (en) * | 2019-12-10 | 2020-03-27 | 上海航天设备制造总厂有限公司 | Insulating corrosion-resistant coating for substrate surface and preparation method thereof |
| CN111276275A (en) * | 2020-03-10 | 2020-06-12 | 西比里电机技术(苏州)有限公司 | Novel high-temperature insulated wire, preparation method and coating equipment |
| CN111809176A (en) * | 2020-07-20 | 2020-10-23 | 辽宁科技大学 | Preparation method of protective coating based on cold spraying and high-current pulse electron beam irradiation |
| CN112458453A (en) * | 2020-11-24 | 2021-03-09 | 安徽盈锐优材科技有限公司 | High-bonding-strength ceramic insulating coating and preparation method thereof |
| CN115044859A (en) * | 2022-06-17 | 2022-09-13 | 中国船舶重工集团公司第七二五研究所 | Titanium alloy material surface treatment method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923695A (en) * | 2019-12-10 | 2020-03-27 | 上海航天设备制造总厂有限公司 | Insulating corrosion-resistant coating for substrate surface and preparation method thereof |
| CN111276275A (en) * | 2020-03-10 | 2020-06-12 | 西比里电机技术(苏州)有限公司 | Novel high-temperature insulated wire, preparation method and coating equipment |
| CN111809176A (en) * | 2020-07-20 | 2020-10-23 | 辽宁科技大学 | Preparation method of protective coating based on cold spraying and high-current pulse electron beam irradiation |
| CN112458453A (en) * | 2020-11-24 | 2021-03-09 | 安徽盈锐优材科技有限公司 | High-bonding-strength ceramic insulating coating and preparation method thereof |
| CN112458453B (en) * | 2020-11-24 | 2023-09-15 | 安徽盈锐优材科技有限公司 | Ceramic insulating coating with high bonding strength and preparation method thereof |
| CN115044859A (en) * | 2022-06-17 | 2022-09-13 | 中国船舶重工集团公司第七二五研究所 | Titanium alloy material surface treatment method |
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