CN106399899A - Wear-resisting corrosion-resisting magnesium alloy and preparation method thereof - Google Patents
Wear-resisting corrosion-resisting magnesium alloy and preparation method thereof Download PDFInfo
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- CN106399899A CN106399899A CN201611015128.0A CN201611015128A CN106399899A CN 106399899 A CN106399899 A CN 106399899A CN 201611015128 A CN201611015128 A CN 201611015128A CN 106399899 A CN106399899 A CN 106399899A
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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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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Abstract
The invention discloses wear-resisting corrosion-resisting magnesium alloy. The wear-resisting corrosion-resisting magnesium alloy comprises a NiCrAl bonding bottom layer attached to the surface of magnesium alloy and an Al2O3/WC ceramic coating layer attached to the NiCrAl bonding bottom layer, wherein the thickness of the NiCrAl bonding bottom layer is 150-200 micrometers, and the thickness of the Al2O3/WC ceramic coating layer is 350-700 micrometers. The wear-resisting corrosion-resisting magnesium alloy prepared through a preparation method is high in hardness, resistant to wear and corrosion and excellent in performance.
Description
Technical field
The present invention relates to field of material technology, more particularly, to a kind of wear resistant corrosion resistant magnesium alloy and preparation method thereof.
Background technology
Because magnesium alloy has specific strength, specific stiffness height, heat conductivity, machinability are good, and electromagnetic shielding capability waits by force special
Point is so that magnesium alloy has important application in automobile, electronics, electrical equipment, traffic, space flight, aviation and national defense and military industrial circle
It is worth and application prospect.
In recent years, magnesium alloy application improves year by year, but some problems to be resolved make the application cost of magnesium alloy still
Very high.Because the chemical property of magnesium is very active, easily with oxygen, nitrogen gas and water, CO2、SO2Generate consistency etc. reacting
One layer of relatively low non-metallic film of coefficient, this tunic can not play, to metallic matrix, the effect of being effectively protected.In addition, the standard electric of magnesium
Electrode potential is -2.34eV, is minimum in common metal structural material, when contacting with other metals, galvanic corrosion easily occurs
And accelerate to dissolve.Further, the burning-point of magnesium alloy is low, and in fusion process, easily burning is it is therefore necessary to take protective measure, industrial
Mainly adopt saline flux or gas shield in production, the former easily causes foundry goods and is mingled with, affect product quality, HCl of release etc.
Gaseous contamination environment；Or adopt SF more6Gas, harmless, but due to SF6It is the greenhouse gases making terrestrial climate warm,
Its greenhouse effect is CO223900 times.And the hardness of magnesium conjunction is relatively low, this results in it and wears no resistance.These all become restriction
The key issue of magnesium alloy application.
Content of the invention
It is an object of the invention to proposing a kind of wear resistant corrosion resistant magnesium alloy and preparation method thereof, can be in Mg alloy surface
Prepared bond strength is high, anti-corrosion, wearability is good coating.Can minimize cost simultaneously again, reduce the pollution to environment.
For reaching this purpose, the present invention employs the following technical solutions：
A kind of wear resistant corrosion resistant magnesium alloy, it includes the NiCrAl bond coating being attached to Mg alloy surface, and attachment
Al on this NiCrAl bond coating2O3/ WC ceramic coating, wherein NiCrAl bond coating thickness are 150-200 μm,
Al2O3/ WC thickness of ceramic coating is 350-700 μm.
The present invention also provides the preparation method of described wear resistant corrosion resistant magnesium alloy, and methods described includes：
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is simultaneously dried；
(3) be dried magnesium alloy matrix surface flame-spraying NiCrAl bond coating, spray distance be 100mm～
150mm, between spray angle is 60 °～90 °, powder feeding throughput is 0.6～0.8m3/ h, coating layer thickness is 150-200 μm；
(4) spray Al in NiCrAl bond coating upper plasma2O3/ WC ceramic coating, spray distance be 100mm～
150mm, plasma flame flow axis and be sprayed-on specimen surface angle be no less than 45 °, spray angle between 45 °～90 °,
Powder feeding throughput is 0.6～0.8m3/h, and coating layer thickness is 350-700 μm.
NiCrAl of the present invention, between its each composition, ratio does not do specific restriction, as long as each composition reaches effectively
Measure, for example, its atomic ratio ratio can be 1:1:2:0.3,1:1.5:3:0.5.
Described Al2O3In/WC ceramic coating, Al2O3With the ratio of WC, be equally each composition in effective dose scope,
Such as Al2O3:WC mol ratio is 7-3:1.
Preferably, the present invention, before magnesium alloy matrix surface sandblasting roughening treatment, magnesium alloy substrate is heated to 80-
100℃.Before spraying, matrix material is suitably preheated, moisture and the dampness of specimen surface can be eliminated, improved spraying particle
With interface temperature during substrate contact, reduce the painting leading to because of the stress that the thermal dilation difference of matrix material and coating material causes
Layer cracking, thus improve the bond strength of coating and matrix.
The present invention selects NiCrAl alloy powder as gradient ceramic coating intermediate layer.NiCrAl alloy powder is using temperature
The alloy powder that degree is higher, high-temperature comprehensive property is excellent.Al is strong deoxidizer, and therefore Al2O3 can suppress external agency to mother
The corrosion further of material metal.And the hardness of Ni is high, the Cr2O3 oxide-film of generation can not only stop gas further to coating
Oxidation, can also strengthen the wearability of coating simultaneously.There is the α-Al of protectiveness2O3The formation of film, improves Ni-Cr-Al alloy oxygen
Change the adhesiveness of film and matrix, prevent the peeling of oxide-film；The antioxygenic property increasing bond strength and improving coating.
As in the NiCrAl alloy of bond coating containing the alloying element that Al and Cr both corrosion resisting properties are very outstanding,
Form one layer of fine and close oxide-film in alloy surface, stop interface oxygen atom by oxide-film to internal diffusion, and aoxidize
Film being capable of intactly covering alloy surface.Plasma spraying ceramic coat has played good covering protection effect again to bottom, enters
One step improves the corrosion resisting property of alloy.
The coating microhardness of the present invention be more than 1020HV, significantly larger than magnesium alloy substrate microhardness (less than
100HV), substantially increase its anti-wear performance.
Using salt water immersion test, also referred to as immersion corrosion test.After 24h, result is as follows, does not spray sample corrosion acutely, rotten
Erosion is serious, and surface forms a large amount of black point corrosion pits, and it is uneven that surface becomes, and has a large amount of corrosion products to produce.And spray sample
Corrosion is slow, is substantially not affected by corroding.
The magnesium alloy that the preparation method of the present invention prepares, its hardness is high, wear-resisting and corrosion-resistant, excellent performance.
Specific embodiment
To further illustrate technical scheme below by specific embodiment.
Embodiment 1
Prepare wear resistant corrosion resistant magnesium alloy according to following processing steps：
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is simultaneously dried；
(3) in the magnesium alloy matrix surface flame-spraying NiCrAl bond coating being dried, spray distance is 100mm, spray
Apply angle for, between 60 °, powder feeding throughput is 0.6m3/ h, coating layer thickness is 150 μm；
(4) spray Al in NiCrAl bond coating upper plasma2O3/ WC ceramic coating, spray distance is 100mm, plasma
Flame stream axis is no less than 45 ° with the angle being sprayed-on specimen surface, and at 45 °, powder feeding throughput is 0.6m to spray angle3/ h,
Coating layer thickness is 350 μm.
The wear resistant corrosion resistant magnesium alloy that methods described obtains, including the NiCrAl bond coating being attached to Mg alloy surface,
And it is attached to the Al on this NiCrAl bond coating2O3/ WC ceramic coating.
Embodiment 2
Prepare wear resistant corrosion resistant magnesium alloy according to following processing steps：
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is simultaneously dried；
(3) in the magnesium alloy matrix surface flame-spraying NiCrAl bond coating being dried, spray distance is 150mm, spray
Apply angle and be 90 °, powder feeding throughput is 0.8m3/ h, coating layer thickness is 200 μm；
(4) spray Al in NiCrAl bond coating upper plasma2O3/ WC ceramic coating, spray distance is 150mm, plasma
Flame stream axis is no less than 45 ° with the angle being sprayed-on specimen surface, and at 90 °, powder feeding throughput is 0.8m to spray angle3/ h,
Coating layer thickness is 700 μm.
The wear resistant corrosion resistant magnesium alloy that methods described obtains, including the NiCrAl bond coating being attached to Mg alloy surface,
And it is attached to the Al on this NiCrAl bond coating2O3/ WC ceramic coating.
Embodiment 3
Prepare wear resistant corrosion resistant magnesium alloy according to following processing steps：
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is simultaneously dried；
(3) in the magnesium alloy matrix surface flame-spraying NiCrAl bond coating being dried, spray distance is 130mm, spray
Apply angle and be 70 °, powder feeding throughput is 0.7m3/ h, coating layer thickness is 170 μm；
(4) spray Al in NiCrAl bond coating upper plasma2O3/ WC ceramic coating, spray distance is 170mm, plasma
Flame stream axis is no less than 45 ° with the angle being sprayed-on specimen surface, and at 60 °, powder feeding throughput is 0.7m to spray angle3/ h,
Coating layer thickness is 500 μm.
The wear resistant corrosion resistant magnesium alloy that methods described obtains, including the NiCrAl bond coating being attached to Mg alloy surface,
And it is attached to the Al on this NiCrAl bond coating2O3/ WC ceramic coating.
Claims (3)
1. a kind of wear resistant corrosion resistant magnesium alloy, it includes the NiCrAl bond coating being attached to Mg alloy surface, and is attached to
Al on this NiCrAl bond coating2O3/ WC ceramic coating, wherein NiCrAl bond coating thickness are 150-200 μm, Al2O3/
WC thickness of ceramic coating is 350-700 μm.
2. the preparation method of wear resistant corrosion resistant magnesium alloy as claimed in claim 1, methods described includes：
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is simultaneously dried；
(3) in the magnesium alloy matrix surface flame-spraying NiCrAl bond coating being dried, spray distance is 100mm～150mm,
Between spray angle is 60 °～90 °, powder feeding throughput is 0.6～0.8m3/ h, coating layer thickness is 150-200 μm；
(4) spray Al in NiCrAl bond coating upper plasma2O3/ WC ceramic coating, spray distance is 100mm～150mm, etc.
Ion flame stream axis and be sprayed-on specimen surface angle be no less than 45 °, spray angle between 45 °～90 °, powder feeding air-flow
Measure as 0.6～0.8m3/h, coating layer thickness is 350-700 μm.
3. preparation method as claimed in claim 2 is it is characterised in that before magnesium alloy matrix surface sandblasting roughening treatment,
Magnesium alloy substrate is heated to 80-100 DEG C.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107312996A (en) * | 2017-06-26 | 2017-11-03 | 安徽雷萨重工机械有限公司 | A kind of low-cost aluminum alloy surface heat spraying method |
| CN109440053A (en) * | 2018-12-12 | 2019-03-08 | 中国人民解放军空军工程大学 | A kind of absorption coating material and preparation method thereof |
| CN110424004A (en) * | 2019-08-02 | 2019-11-08 | 燕山大学 | A kind of liner repair materials of steam powder machine and the restorative procedure of steam powder machine |
| CN111099476A (en) * | 2019-12-24 | 2020-05-05 | 绍兴顺泰机械科技有限公司 | Wear-resistant elevator safety clamp block |
| CN111363966A (en) * | 2020-04-09 | 2020-07-03 | 莆田学院 | Zinc liquid corrosion wear resistant high-boron alloy material and preparation method thereof |
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| CN1147565A (en) * | 1996-06-06 | 1997-04-16 | 西安交通大学 | Metal-carbide coating preventing superheater of power station boiler from heat corrosion |
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| CN1147565A (en) * | 1996-06-06 | 1997-04-16 | 西安交通大学 | Metal-carbide coating preventing superheater of power station boiler from heat corrosion |
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| CN105755422A (en) * | 2016-03-30 | 2016-07-13 | 中国人民解放军装甲兵工程学院 | Method and device for preparing gradient metal ceramic composite coating on surface of bias current plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107312996A (en) * | 2017-06-26 | 2017-11-03 | 安徽雷萨重工机械有限公司 | A kind of low-cost aluminum alloy surface heat spraying method |
| CN109440053A (en) * | 2018-12-12 | 2019-03-08 | 中国人民解放军空军工程大学 | A kind of absorption coating material and preparation method thereof |
| CN110424004A (en) * | 2019-08-02 | 2019-11-08 | 燕山大学 | A kind of liner repair materials of steam powder machine and the restorative procedure of steam powder machine |
| CN111099476A (en) * | 2019-12-24 | 2020-05-05 | 绍兴顺泰机械科技有限公司 | Wear-resistant elevator safety clamp block |
| CN111363966A (en) * | 2020-04-09 | 2020-07-03 | 莆田学院 | Zinc liquid corrosion wear resistant high-boron alloy material and preparation method thereof |
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