CN102392208B - Method for spraying aluminum coating on surface of magnesium alloy - Google Patents
Method for spraying aluminum coating on surface of magnesium alloy Download PDFInfo
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- CN102392208B CN102392208B CN2011104179905A CN201110417990A CN102392208B CN 102392208 B CN102392208 B CN 102392208B CN 2011104179905 A CN2011104179905 A CN 2011104179905A CN 201110417990 A CN201110417990 A CN 201110417990A CN 102392208 B CN102392208 B CN 102392208B
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- magnesium alloy
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- 238000000576 coating method Methods 0.000 title claims abstract description 50
- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 40
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 35
- 238000005507 spraying Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003350 kerosene Substances 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000004411 aluminium Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 4
- 239000012159 carrier gas Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 230000008021 deposition Effects 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 239000011777 magnesium Substances 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract 1
- 239000002932 luster Substances 0.000 abstract 1
- 239000004576 sand Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 238000010288 cold spraying Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000010285 flame spraying Methods 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910007570 Zn-Al Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- -1 and flow is 11~13L/h Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 229910021652 non-ferrous alloy Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The invention relates to a method for spraying an aluminum coating on the surface of a magnesium alloy. The method is characterized in that: acetone is used to remove oil, and the magnesium alloy to be sprayed undergoes sand blowing treatment until the surface is uniformly rough and has no metal luster; the caliber of the jet orifice of a combustion chamber is phi5.0mm, and the oxygen inlet pressure is 18-25bar; the inner dimension of a spray tube*the length of the spray tube is phi11.5mm*96mm, the pressure in the combustion chamber is 13-15bar, and the kerosene flow is 11-13L/h; the oxygen flow is 700-900L/h; the spray powder is industrial aluminum powder with the purity of equal to or more than 99% and the granularity of -100-+300 meshes, nitrogen is adopted as a powder supply carrier, and the aluminum coating is sprayed on the surface of the magnesium alloy under conditions that the powder supply rate is 15-30g/min, the spray distance is 80-300mm, the ejection speed is 800-1200mm/s, and the matrix temperature is lower than 150DEG C. According to the method of the invention, the flame flow rate is large, the content of oxygen in the flame is low, and the aluminum coating containing equal to or less than 0.5 wt% of oxygen on the surface of the magnesium surface can be obtained; the combined strength between the aluminum coating and the magnesium alloy matrix is more than 25MPa, the structure is compact, and the corrosion resistance is excellent; and the coating deposition efficiency is high, the coating deposition speed is fast, and the coating thickness is uniform.
Description
Technical field
The present invention relates to a kind of method of spraying aluminum coating on surface of magnesium alloy, belong to field of metal surface treatment technology.
Background technology
Magnesium alloy has the advantages such as density is little, specific tenacity is high, capability of electromagnetic shielding is good, be described as 21 century green engineering metal, have broad application prospects in fields such as automobile, aviation and electronic industries, however the practical ranges of shortcoming greatly the limited magnesium alloy such as the chemically reactive of magnesium is high, perishable.For making magnesium alloy materials be applied to comparatively harsh Service Environment, develop corresponding process for treating surface very necessary, the sufacing that exists at present comprises chemical conversion, anodic oxidation (and differential arc oxidation), metal plating etc.
In the design to surface protective coating for magnesium alloy, people are devoted to develop a kind of protective coating that satisfies the multiple requirements such as corrosion-resistant, easy recovery, environmental protection, wherein be considered to satisfy the desirable protective layer of these requirements at its surface-coated aluminum coating, reason has: 1) electropotential of aluminium and magnesium are more or less the same, and can not cause serious galvanic corrosion to magnesium alloy; 2) surface treatment of aluminium with respect to the magnesium alloy maturation many, make further subsequent disposal, can obtain the compound coating that hardness is high, corrosion-proof wear is good such as chemical conversion, anodic oxidation, differential arc oxidation etc.; 3) aluminium is the important alloying element of magnesium alloy, and the existence of aluminum coating has no adverse effect to the recycling of magnesium alloy.
Spraying technology is the effective ways of fast deposition aluminum coating, and electric arc spraying is the conventional spraying technology of the low melting point metals such as aluminium, zinc.The people such as Zhang Jin (Zhang Jin, the aluminium-plated coating research [J] of the rich .AZ91D Mg alloy surface heat of Sun Zhi. " China Mechanical Engineering ", 2002 (23), p2057-2059) adopt the earliest electric arc spraying at spraying aluminum coating on surface of magnesium alloy, can strengthen bonding strength between aluminum coating and the magnesium alloy substrate by the subsequent thermal DIFFUSION TREATMENT, corrosion resistance of magnesium alloy has obtained good improvement.Cold air power spraying and coating (cold spraying) is a kind of novel spraying technique that developed recently gets up, (300～1000m/s) bump matrixes are by occuring to form coating after the viscous deformation deposition with higher speed far below spray material fusing point solid-state lower in temperature for particle.In recent years, Liu Yanxue (Liu Yanxue etc., the research [J] of Mg alloy surface cold spraying Rapidly Solidified Zn-Al Alloy Powder, " Special Processes of Metal Castings and non-ferrous alloy ", 2006 (26), p204-207), Dong Caichang (Dong Caichang, cold spraying aluminum coating surface property characterizes and corrosion behavior research. Chinese Marine University's master thesis) etc. attempt in coatings such as magnesium alloy and the spraying of other metallic surfaces Al, Zn-Al, the result shows, the coating oxygen level is few, compact structure, excellent corrosion resistance.The former bonding strength of Mg alloy surface cold spraying Zn-Al coating is 14.4MPa, and the bonding strength of latter's cold spraying aluminum coating is 8.5MPa.
The bonding properties of spray-on coating is one of key index that affects the coating use, and magnesium alloy is high owing to chemically reactive, easily oxidation of surface, and the coating high in its surface deposition bonding strength is difficult especially.The flight velocity that the electric arc spraying molten aluminum drips is slower, easily oxidation, and local oxygen level reaches 13wt%, and the coating porosity of formation is large, uneven components, and is not good with the bonding properties of matrix.Pertinent literature shows, behind the aluminum coating process optimization of electric arc spraying bonding strength be to the maximum 11.12MPa (Qu Ming, the research of Mg alloy surface arc spraying aluminium zinc technology and coating performance. Liaoning Project Technology University's master thesis).Although cold spraying can effectively be avoided the oxidation of coated material and form the coating of compact structure, material fails to be heated to molten state, and spraying particle spreading area on matrix is little, and the bonding strength of coating also has much room for improvement.
Hypersonic flame spraying has that flying speed of partcles is high, powder is heated evenly, good with the matrix bonding properties after the powder particle cladding, the advantages such as coating structure densification that form are often made the hot-spraying techniques of higher melt (1000～2500 ℃) coated materials such as oxide ceramics, carbide metal-ceramic.Utilize the high velocity characteristic of hypersonic flame spraying, the direct spraying aluminum coating is conducive to obtain compact structure, aluminum coating that bonding properties is good, have the performance advantage of cold spraying, but the hypersonic flame spraying technology is more ripe, simple operation, with low cost.Different from oxide compound and inert metal, how low-melting aluminium (660 ℃) easier oxidation in supersonic spray coating atmosphere guarantees that aluminum particulate fully melts and the not oxidized key that becomes the technology realization in spraying process.
Summary of the invention
The object of the invention is to fully excavate the advantage of hypersonic flame spraying technology, spraying method is improved, a kind of method in Mg alloy surface deposition of aluminum coating is provided, makes the aluminum coating of preparation have the advantages such as oxygen level is low, bonding strength is high, and solidity to corrosion is good.
The present invention implements by following technical proposal: concrete spraying method is as follows: use the acetone oil removing, blast is processed magnesium alloy member to be sprayed, and is coarse to surface uniform, without metalluster; Be Φ 5.0mm at combustion chamber jet orifice bore, oxygen intake pressure 18～25bar, jet pipe internal diameter size * length is Φ 11.5mm * 96mm, internal pressure of combustion chamber is 13～15bar, kerosene oil flow is 11～13L/h, oxygen flow is 700～900L/h, dusty spray is the industrial aluminium powder of purity 〉=99%, granularity-100～+ 300 orders, adopting nitrogen is the powder feeding carrier gas, powder feeding rate is 15～30g/min, the spray distance is 80～300mm, walking rifle speed is 800～1200mm/s, under the condition that substrate temperature control is＜150 ℃, to spraying aluminum coating on surface of magnesium alloy.
For realizing purpose of the present invention, conventional hypersonic flame spraying system is made transformation.Combustion chamber jet orifice bore is transform as the small-bore Φ 5.0mm of spraying low melting point aluminium by the Φ 7.8mm of spraying refractory metal; Increase the intake pressure of combustion-supporting oxygen more than 18～25bar; Adopting short jet pipe internal diameter size is Φ 11.5mm * 96mm.Above measure can keep internal pressure of combustion chamber at 13～15bar, reduces flame a fluid stream diameter, is conducive to increase flame a fluid stream speed, reduces temperature, reduces particle flight heated time.Aviation kerosene is fuel, and flow is 11～13L/h, and oxygen is combustion-supporting gas, and flow is 700～900L/min, has guaranteed full combustion of fuel, and oxygen level is few in the spraying flame, avoids molten aluminum oxidized.Dusty spray is the industrial aluminium powder of purity 〉=99%, and granularity is at-100～+ 300 orders, and adopting nitrogen is the powder feeding carrier gas, and powder feeding rate is 15～30g/min.For guaranteeing the homogeneity of coat-thickness, with robot is armed base material is sprayed, spray is apart from being 80～300mm, walking rifle speed is 800～1200mm/s,＜150 ℃ of substrate temperature controls.
Compared with prior art, the present invention has following significant advantage:
1. to after the hypersonic flame spraying system reform, the flame Flow Velocity is large, and oxygen level is low in the flame, can obtain at Mg alloy surface the fine aluminium coating of oxygen level≤0.5wt%.
2. aluminum coating and magnesium alloy base material bonding strength＞25MPa, compact structure, fine corrosion resistance.
3. the coating sedimentation effect is high, speed is fast, and approximately 35～45 μ m/ times, even thickness, less demanding to spraying raw material.
Description of drawings
The metallographic cross-section photograph of Fig. 1 aluminum coating;
Fig. 2 is without 48 hours post-etching patterns of aluminum coating AZ91D magnesium alloy salt-fog test;
Fig. 3 sprays 48 hours post-etching patterns of aluminum coating AZ91D magnesium alloy salt-fog test.
Embodiment
The present invention selects AZ91D and AZ31B magnesium alloy base material.After the oil removing of ultrasonic wave acetone, 120# white fused alumina or 24# palm fibre corundum blast, to be sprayed coarse by the surface uniform behind the blast, without metalluster; Combustion chamber jet orifice bore: Φ 5.0mm; Jet pipe internal diameter size * length: Φ 11.5mm * 96mm; Oxygen intake pressure 18～25bar.
The below elaborates to embodiments of the invention, and the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.Embodiment sees the following form 1.
Table 1
Testing method: the thickness of coating adopts Leica DMIRM metaloscope to measure; The oxygen level of coating adopts TC-600 oxygen nitrogen tester to measure; The bonding strength test of coating is abideed by GBT8642-88 " mensuration of metal thermal spraying layer bonding strength " and is carried out; The erosion resistance of coating is carried out in accordance with GBT10125-1997 " artificial atmosphere corrosion test salt-fog test " GBT 6461-2002 " metal and the sample of other inorganic cover layers after corrosion test and the grading of test specimen on the metallic matrix ", the results are shown in Table 2.
The test result of table 2 embodiment
Claims (1)
1. the method for a spraying aluminum coating on surface of magnesium alloy is characterized in that using the acetone oil removing, and blast is processed magnesium alloy member to be sprayed, and is coarse to surface uniform, without metalluster; Be Φ 5.0mm at combustion chamber jet orifice bore, oxygen intake pressure 18～25bar, jet pipe internal diameter size * length is Φ 11.5mm * 96mm, internal pressure of combustion chamber is 13～15bar, kerosene oil flow is 11～13L/h, oxygen flow is 700～900L/h, dusty spray is the industrial aluminium powder of purity 〉=99%, granularity-100～+ 300 orders, adopting nitrogen is the powder feeding carrier gas, powder feeding rate is 15～30g/min, the spray distance is 80～300mm, walking rifle speed is 800～1200mm/s, under the condition that substrate temperature control is＜150 ℃, to spraying aluminum coating on surface of magnesium alloy.
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| CN2011104179905A CN102392208B (en) | 2011-12-13 | 2011-12-13 | Method for spraying aluminum coating on surface of magnesium alloy |
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| CN2011104179905A CN102392208B (en) | 2011-12-13 | 2011-12-13 | Method for spraying aluminum coating on surface of magnesium alloy |
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| CN102817029B (en) * | 2012-06-14 | 2015-04-15 | 中国人民解放军装甲兵工程学院 | Preparation method of aluminium-based alloy thick coating for magnesium alloy surface |
| CN103255365B (en) * | 2013-05-22 | 2016-01-20 | 北京工业大学 | A kind of Mg alloy surface corrosion-proof wear coating and preparation method thereof |
| CN104010463A (en) * | 2014-06-03 | 2014-08-27 | 亚超特工业有限公司 | Integrated metal structural part forming method and integrated metal structural part |
| CN105908118B (en) * | 2016-06-20 | 2018-01-23 | 湖北工业大学 | It is a kind of to prepare Al Mg in Mg alloy surface3Sb2The method of composite coating |
| CN106544609B (en) * | 2016-11-25 | 2020-06-23 | 无锡福镁轻合金科技有限公司 | Extrusion forming process of high-strength magnesium alloy plate for high-speed train seat |
| CN107400842B (en) * | 2017-07-11 | 2019-06-11 | 深圳仕上电子科技有限公司 | The electric arc combined coat processing method of semiconductor device |
| CN111014652A (en) * | 2019-12-03 | 2020-04-17 | 中国航空制造技术研究院 | Aluminum alloy amorphous powder material, preparation method, application and coating preparation method |
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| US20080011813A1 (en) * | 2006-07-17 | 2008-01-17 | David Vincent Bucci | Repair process for coated articles |
| CN102071388A (en) * | 2009-11-19 | 2011-05-25 | 佳木斯大学 | Method for preparing anticorrosive coating for magnesium and lithium alloy |
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