CN101693986A - Process for preparing compact thick protection layers on magnesium alloy surfaces - Google Patents
Process for preparing compact thick protection layers on magnesium alloy surfaces Download PDFInfo
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- CN101693986A CN101693986A CN200910232935A CN200910232935A CN101693986A CN 101693986 A CN101693986 A CN 101693986A CN 200910232935 A CN200910232935 A CN 200910232935A CN 200910232935 A CN200910232935 A CN 200910232935A CN 101693986 A CN101693986 A CN 101693986A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 238000007747 plating Methods 0.000 claims abstract description 24
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000011241 protective layer Substances 0.000 claims description 44
- 239000010410 layer Substances 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 20
- 238000002360 preparation method Methods 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 14
- 239000011248 coating agent 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
- 229960002050 hydrofluoric acid Drugs 0.000 claims description 10
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical class [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 10
- 235000009529 zinc sulphate Nutrition 0.000 claims description 10
- 229910000676 Si alloy Inorganic materials 0.000 claims description 9
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 8
- 238000007788 roughening Methods 0.000 claims description 8
- 230000004913 activation Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 238000010410 dusting Methods 0.000 claims description 4
- 238000010285 flame spraying Methods 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000010405 reoxidation reaction Methods 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 239000000758 substrate Substances 0.000 abstract description 2
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- RZLVQBNCHSJZPX-UHFFFAOYSA-L zinc sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Zn+2].[O-]S([O-])(=O)=O RZLVQBNCHSJZPX-UHFFFAOYSA-L 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 239000007921 spray Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 229910018125 Al-Si Inorganic materials 0.000 description 4
- 229910018520 Al—Si Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 4
- 239000011863 silicon-based powder Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
A process for preparing compact thick protection layers on magnesium alloy surfaces, which includes steps of surface pretreatment, flame plating alloy powder, laser remelting and the like, is added with a surface pretreatment procedure of deoxidation galvanization, and reasonably determines key process parameters. The process is particularly characterized in that solution of the deoxidation galvanization is water solution prepared by hydrofluoric acid (50ml/L) and zinc sulfate heptahydrate (50g/L), time of the deoxidation galvanization procedure ranges from 15 seconds to 20 seconds, preheating temperatures of primary plating and secondary plating of the flame plating are respectively 60-120 DEG C and 150-200 DEG C, laser power of the laser remelting ranges from 1250 W to 1500 W, scanning speed thereof is 500mm/min, and light spot diameter thereof is 4mm. The thickness of a protection layer obtained by preparing flame plating aluminium-silicon alloy powder and laser remelting achieves over 1.5mm, the protection layer is compact in structure without shortages of pores and the like, rigidity of the protection layer ranges from 225HV to 270 HV( which is 4.5-4.9 times of that of a substrate, the thickness direction of the protection layer seldom changes, the component (by mass percentage) of the protection layer is 33.77-53.35Al-62.04-40.76Mg-4.19-5.89Si, and boundaries of the protection layers are in alloy combination.
Description
Technical field
The present invention relates to a kind of surface treatment method of magnesium alloy, especially a kind of preparation method, specifically a kind of preparation method of compact thick protection layers on magnesium alloy surfaces at the fine and close and thick protective layer of Mg alloy surface formation one deck.
Background technology
As everyone knows, magnesium alloy has light weight, the specific tenacity height, the specific rigidity height, damping absorbing performance is good, electromagnetic shielding is good, heat conductivility is superior, machinability is good, easily casting, good biocompatibility, excellent properties such as can utilize ad infinitum again, in aerospace, weaponry, the vehicles (comprise automobile, aircraft, motorcycle, bike etc.), 3C, fields such as medicine equipment have broad application prospects, but its hardness is low, wear resistance and erosion resistance are relatively poor, seriously affect its use, the surface modification of therefore all attaching great importance to magnesium alloy in recent years both at home and abroad is the exploitation of surface protection technique.
The process for modifying surface of magnesium alloy is more, as plating, electroless plating, ion implantation, vapour deposition, differential arc oxidation etc., but the protective layer of these technology preparations be not too thin be exactly not fine and close.Up to the present, there still do not have a kind of modification technology to obtain the surface protecting layer of fine and close, thick (having enough surpluses to be used for follow-up mechanical cutting processing to improve surface quality such as surface smoothness) at Mg alloy surface to be available.
Flame spray welding is a kind ofly commonly used ferrous materials to be carried out process for modifying surface, it has characteristics such as inexpensive, energy-conservation, efficient, flexible, the protection bed thickness that obtained and densification, but relevant report is not seen in the application on Mg alloy surface as yet, and it is generally acknowledged and be not suitable for adopting the flame spray welding technology to carry out surface modification on the magnesium alloy substrate.Cause the major cause of above-mentioned situation to be: (1) Mg alloy surface is active high, very strong with the avidity of oxygen, very high at its negative free energy of the formed magnesium oxide of Mg alloy surface, other elements are difficult to its reduction in the protective layer, in implementing the flame spray welding process, be difficult to obtain clean Surface, having a strong impact on the bonding properties of matrix and protective layer; (2) because the energy density of flame remolten is low, surface action is little, before the alloying element of matrix and coating took place fully to spread with the metallurgical binding that obtains, the magnesium alloy base material can be because too high generation severe oxidation of temperature rise even burning.So the flame spray welding technology is that flame plating+flame remolten technology can not obtain fine and close and thick protective layer.But different with flame remolten, therefore remarkable characteristic such as laser remolten has the energy density height, surface action is big, rate of heating is fast, adopts laser remolten to prepare thick and fine and close protective layer at Mg alloy surface after flame plating.Simultaneously,, before flame plating, Mg alloy surface is carried out activation treatment, also can overcome the deficiency that the easy oxidation of Mg alloy surface is difficult to obtain clean interface if can pass through certain technological measure.
Summary of the invention
The objective of the invention is to be difficult to form fine and close and thick protective layer and to influence the problem of its performance and purposes, invent a kind of preparation method of thickness that existing various surface treatment methods are organically combined and finally can obtain at the fine and close protective layer more than 1.5 millimeters at present Mg alloy surface.
Technical scheme of the present invention is:
A kind of preparation method of compact thick protection layers on magnesium alloy surfaces is characterized in that it mainly may further comprise the steps:
(1) surface preparation;
(2) flame plating powdered alloy;
(3) laser remolten sprayed coating;
Described surface preparation comprises roughening treatment and two steps of the zinc-plated activation treatment of deoxidation, roughening treatment is to adopt the method for machinery to make Mg alloy surface satisfy the requirement of roughness Ra 25～12.5, thereby improves both snap-in forces with the contact surface that increases protective layer and magnesium alloy; The zinc-plated activation treatment of described deoxidation is meant that the aqueous solution that places hydrofluoric acid and six water zinc sulphates to be made in the magnesium alloy through roughening treatment embathes operation 15～25 seconds, also the aqueous solution that is made into of available hydrogen fluoric acid and six water zinc sulphates is cleaned the Mg alloy surface at least one time after the alligatoring, so that remove the magnesium oxide of Mg alloy surface, and form the zinc film of the magnesium alloy reoxidation after preventing to clean, the film formed oxide compound of this layer zinc is other element reductions (as silicon etc.) in the preparation process of protective layer subsequently can be by protective layer, thereby have guaranteed that magnesium alloy and protective layer have the bonding interface of cleaning;
After being meant and will being heated to 60～120 ℃ through pretreated magnesium alloy earlier, described flame plating powdered alloy utilize flame spraying at its surface spraying aluminum silicon alloy protective layer; And then after the magnesium alloy that will have the aluminum silicon alloy protective layer is heated to 150～200 ℃ once more, utilizes flame spraying to carry out secondary aluminum silicon alloy powder spraying again and reach more than the 1.5mm up to sprayed coating thickness;
Described laser remolten sprayed coating is meant and utilizes laser apparatus that described flame spray coating is carried out laser remolten that the spot diameter of laser apparatus is 3-5mm, sweep velocity 0.1～1m/min, power 1250～1500W.
In the laser scanning remelting, small amount of nitrogen can be fed or argon gas is protected.
The content of hydrofluoric acid and six water zinc sulphates is that hydrofluoric acid six 40-60ml/L, six water zinc sulphates are 40-60g/L in the described aqueous solution, and surplus is a pure water.
Oxygen pressure during described flame plating is that 0.4～0.5MPa, oxygen flow are 0.65～0.70m
3/ h, acetylene gas pressure are that 0.07～0.08MPa, acetylene gas flow are 0.55～0.65m
3Powder sending quantity 1.0～the 1.4kg/h of/h, aluminum silicon alloy powder, the distance of dusting are 100～120mm.
Beneficial effect of the present invention:
(1) the invention provides a kind of processing method for preparing compact thick protection layers at Mg alloy surface, its thickness reaches more than the 1.5mm, hardness reaches 225～270HV (for 4.5～4.9 times of base material), tangible Elements Diffusion takes place between base material and protective layer, the composition of protective layer (mass percent) is 33.77～53.35 Al-62.04～40.76 Mg-4.19～5.89 Si, and the interface is metallurgical binding completely.
(2) the invention provides a kind of in the zinc-plated technology that unites two into one of Mg alloy surface deoxidation, promptly in the aqueous solution that hydrofluoric acid (50ml/L), six water zinc sulphates (50g/L) are made into, carry out deoxidation and zinc-plated processing simultaneously, avoided deoxidation and the zinc-plated reoxidation midway that Mg alloy surface occurs when separately carrying out.Deoxidation is zinc-plated to have improved resistance of oxidation and the interface combination of magnesium alloy when flame plating greatly.
(3) the present invention is by rationally determining the key process parameter in the spraying process, promptly adopted the preheating temperature that sprays than the low once spraying of general spraying coating process and secondary, controlled the temperature rise and the oxidation of magnesium alloy effectively.
(4) the present invention makes an amount of magnesium of base material element enter coating, thereby when guaranteeing that protective layer has little solidification temperature range to make its dense structure, has improved the hardness of protective layer greatly by alloying by rationally controlling the laser remolten processing parameter.
Description of drawings
Fig. 1 is the metallograph of gained protective layer behind Mg alloy surface flame plating Al-Si powder metallurgy of the present invention, the 1500W laser remolten, and Fig. 1 (a) square section pattern and alloying element are along the layer depth distribution situation; The upper layer tissue topography and the composition of Fig. 1 (b) protective layer; The hardness of Fig. 1 (c) protective layer is with the variation of layer depth.
Fig. 2 is the metallograph of gained protective layer behind Mg alloy surface flame plating Al-Si powder metallurgy of the present invention, the 1250W laser remolten, and Fig. 2 (a) square section pattern and alloying element are along the layer depth distribution situation; The upper layer tissue topography and the composition of Fig. 2 (b) protective layer; The hardness of Fig. 2 (c) protective layer is with the variation of layer depth.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Embodiment one.
Shown in Fig. 1-2.
A kind of preparation method of compact thick protection layers on magnesium alloy surfaces, it mainly may further comprise the steps:
(1) workpiece surface pre-treatment
Roughening treatment.Adopt sand paper, sandblast, mechanical cutting or other method of roughening to make the roughness on surface to be painted reach required suitable crude rugosity (Ra 25～12.5), thereby to increase the snap-in force that contact surface between coating and workpiece improves protective layer and base material, the flowability when guaranteeing the wettability of workpiece surface and protective layer alloy remelting simultaneously.
The zinc-plated activation treatment of deoxidation.In the aqueous solution that the pure water (three's cumulative volume is 1 liter) of hydrofluoric acid (40-60ml/L), six water zinc sulphates (40-60g/L) and surplus is made into, carry out the zinc-plated activation treatment of deoxidation, time is 15～25 seconds, if because condition restriction is inconvenient to embathe operation, can adopt absorbent cotton to be stained with corresponding solution and carry out wiping, for flame plating is got ready.
(2) flame plating
Spray protective layer (once spraying) after will being preheating to 60～120 ℃ through pretreated workpiece earlier, spray powdered alloy (secondary spraying) behind second-heating to 150～200 ℃ then.The thickness of the sprayed coating of secondary spraying gained is not less than 1.5mm.
(3) laser remolten
Adopt the carbon dioxide laser remelting; its basic technology parameter is: spot diameter 3-5mm; sweep velocity 0.5-1m/min; power 1250～1500W; feeding small amount of nitrogen or argon gas protects; make surface protecting layer more fine and close by remelting on the one hand; solved the compactness problem of insurmountable protective layer for a long time; quicken magnesium on the other hand and form transition layer to the infiltration of protective layer; improve the bonding force of protective layer and base material, obtain the aluminum silicon alloy coating that high thickness, high bond strength and highdensity surface seepage have magnesium.
Below be two embodiment more specifically of the present invention, to those skilled in the art, can change relevant parameter according to the described method of embodiment and carry out the enforcement of multiple mode.
Embodiment two.
Base material---AZ91D magnesium alloy, the Al-Si powder metallurgy of spray material---si content 12% (mass percent), the SPH-2/h spray gun that spraying equipment---Shanghai Ruifa Spray Coating Machine Co., Ltd produces, the SLCF-X12*25 type laser apparatus that remelting device---Shanghai Unity Purui Laser Equipment Co., Ltd. produces.Carry out surface preparation earlier by the step described in the embodiment one, carry out flame plating and secondary flame plating then, carry out laser remolten at last, concrete spraying basic technology parameter is: oxygen pressure 0.4～0.5MPa, oxygen flow 0.65～0.70m
3/ h, acetylene gas pressure 0.07～0.08MPa, acetylene gas flow 0.55～0.65m
3/ h, powder sending quantity 1.0～1.4kg/h, the distance of dusting 100～120mm, once spray 150～200 ℃ of 60～120 ℃ of preheating temperatures, secondary spraying preheating temperatures.Laser remolten basic technology parameter: spot diameter 4mm, sweep velocity 0.5m/min, power 1250W feeds small amount of nitrogen and protects.
Adopt the protective layer of above-mentioned prepared gained: (Fig. 1 a), the element of dense structure (Fig. 1 a and Fig. 1 b), base material and coating obvious diffusion all takes place (Fig. 1 a) for thickness 1.7mm, the diffusion of base material magnesium elements is up to the protective layer top (Fig. 1 b), the composition of protective layer (mass percent) is that (its solidification temperature range of the alloy of composition correspondence is very little therewith for 53.35 Al-40.76 Mg-5.89 Si, guaranteed alloy compactness), protective layer hardness height (225HV is 4.5 times of base material) and change little in the overcoat thickness direction.
Embodiment three.
Base material---AZ91D magnesium alloy, the Al-Si powder metallurgy of spray material---si content 12% (mass percent), the SPH-2/h spray gun that spraying equipment---Shanghai Ruifa Spray Coating Machine Co., Ltd produces, the SLCF-X12*25 type laser apparatus that remelting device---Shanghai Unity Purui Laser Equipment Co., Ltd. produces.Carry out surface treatment earlier by the step described in the embodiment one, carry out flame plating and secondary flame plating then, carry out laser remolten at last, concrete spraying basic technology parameter is: oxygen pressure 0.4～0.5MPa, oxygen flow 0.65～0.70m
3/ h, acetylene gas pressure 0.07～0.08MPa, acetylene gas flow 0.55～0.65m
3/ h, powder sending quantity 1.0～1.4kg/h, the distance of dusting 100～120mm, once spray 150～200 ℃ of 60～120 ℃ of preheating temperatures, secondary spraying preheating temperatures.Laser remolten basic technology parameter: spot diameter 4mm, sweep velocity 0.5m/min, power 1500W feeds small amount of nitrogen and protects.
Adopt the protective layer of above-mentioned prepared: (Fig. 2 a), the element of dense structure (Fig. 2 a and Fig. 2 b), base material and coating obvious diffusion all takes place (Fig. 2 a) for thickness 2.0mm, the diffusion of base material magnesium elements is up to the protective layer top (Fig. 2 b), the composition of protective layer (mass percent) is that (its solidification temperature range of the alloy of composition correspondence is very little therewith for 33.77Al-62.04Mg-4.19Si, guaranteed alloy compactness), protective layer hardness height (270HV is 4.9 times of base material) and change little in the overcoat thickness direction.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (4)
1. the preparation method of a compact thick protection layers on magnesium alloy surfaces is characterized in that it mainly may further comprise the steps:
(1) surface preparation;
(2) flame plating powdered alloy;
(3) laser remolten sprayed coating;
Described surface preparation comprises roughening treatment and two steps of the zinc-plated activation treatment of deoxidation, roughening treatment is to adopt the method for machinery to make Mg alloy surface satisfy the requirement of roughness Ra 25～12.5, thereby improves both snap-in forces with the contact surface that increases protective layer and magnesium alloy; The zinc-plated activation treatment of described deoxidation is meant that the aqueous solution that places hydrofluoric acid and six water zinc sulphates to be made in the magnesium alloy through roughening treatment embathes operation 15～25 seconds, also the aqueous solution that is made into of available hydrogen fluoric acid and six water zinc sulphates is cleaned the Mg alloy surface at least one time after the alligatoring, so that remove the magnesium oxide of Mg alloy surface, and formation prevents the zinc film of magnesium alloy reoxidation, the film formed oxide compound of this layer zinc can be by the element reduction in the protective layer in the preparation process of protective layer subsequently, thereby has guaranteed that magnesium alloy and protective layer have the bonding interface of cleaning;
After being meant and will being heated to 60～120 ℃ through pretreated magnesium alloy earlier, described flame plating powdered alloy utilize flame spraying at its surface spraying aluminum silicon alloy protective layer; And then after the magnesium alloy that will have the aluminum silicon alloy protective layer is heated to 150～200 ℃ once more, utilizes flame spraying to carry out secondary aluminum silicon alloy powder spraying again and reach more than the 1.5mm up to sprayed coating thickness;
Described laser remolten sprayed coating is meant and utilizes laser apparatus that described flame spray coating is carried out laser remolten that the spot diameter of laser apparatus is 3-5m, sweep velocity 0.1～1m/min, power 1250～1500W.
2. the preparation method of compact thick protection layers on magnesium alloy surfaces according to claim 1 is characterized in that feeding small amount of nitrogen in the laser scanning remelting or argon gas is protected.
3. the preparation method of compact thick protection layers on magnesium alloy surfaces according to claim 1 is characterized in that the content of hydrofluoric acid and six water zinc sulphates is that hydrofluoric acid six 40-60ml/L, six water zinc sulphates are 40-60g/L in the described aqueous solution, and surplus is a pure water.
4. the preparation method of compact thick protection layers on magnesium alloy surfaces according to claim 1, the oxygen pressure when it is characterized in that described flame plating is that 0.4～0.5MPa, oxygen flow are 0.65～0.70m
3/ h, acetylene gas pressure are that 0.07～0.08MPa, acetylene gas flow are 0.55～0.65m
3Powder sending quantity 1.0～the 1.4kg/h of/h, aluminum silicon alloy powder, the distance of dusting are 100～120mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102443756A (en) * | 2011-11-16 | 2012-05-09 | 布雷尔利（北京）金属家居用品股份有限公司 | Method for preparing magnesium alloy |
| CN104213065A (en) * | 2014-09-15 | 2014-12-17 | 南华大学 | Method for preparing glass ceramic coating layer by thermal spraying-laser in-situ reaction compound technology |
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| CN1112460C (en) * | 1998-04-17 | 2003-06-25 | 清华大学 | Method of preparing ceramic coating by laser smelting coating after metal surface plasma spray |
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| CN101532134B (en) * | 2009-04-24 | 2010-11-17 | 太原理工大学 | Method for enhancing surface of magnesium aluminium alloy by laser remelting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102443756A (en) * | 2011-11-16 | 2012-05-09 | 布雷尔利（北京）金属家居用品股份有限公司 | Method for preparing magnesium alloy |
| CN104213065A (en) * | 2014-09-15 | 2014-12-17 | 南华大学 | Method for preparing glass ceramic coating layer by thermal spraying-laser in-situ reaction compound technology |
| CN104213065B (en) * | 2014-09-15 | 2019-02-22 | 南华大学 | A kind of method that thermal spraying-laser in-situ reaction combination process prepares glass ceramic coating |
| CN106544615A (en) * | 2016-11-18 | 2017-03-29 | 无锡明盛纺织机械有限公司 | A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof |
| CN108355939A (en) * | 2018-03-26 | 2018-08-03 | 重庆搏成防腐工程有限公司 | Steel structure surface anticorrosive construction technique based on laser technology |
| CN109652788A (en) * | 2019-01-15 | 2019-04-19 | 江阴六环合金线有限公司 | A kind of preparation method of nickel-plated mild steel line |
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| CN101693986B (en) | 2011-01-05 |
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