CN114277366A - Magnesium alloy composite structure and manufacturing method thereof - Google Patents
Magnesium alloy composite structure and manufacturing method thereof Download PDFInfo
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- CN114277366A CN114277366A CN202011031462.1A CN202011031462A CN114277366A CN 114277366 A CN114277366 A CN 114277366A CN 202011031462 A CN202011031462 A CN 202011031462A CN 114277366 A CN114277366 A CN 114277366A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 73
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims abstract description 137
- 238000002161 passivation Methods 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 41
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 239000011247 coating layer Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 10
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 24
- 229910052749 magnesium Inorganic materials 0.000 claims description 24
- 239000011777 magnesium Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000009713 electroplating Methods 0.000 claims description 10
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical group [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- 229910052755 nonmetal Inorganic materials 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 229910021392 nanocarbon Inorganic materials 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 2
- -1 sputtering Substances 0.000 claims description 2
- 238000010119 thixomolding Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 230000017525 heat dissipation Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000001962 electrophoresis Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 230000000873 masking effect Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003922 charged colloid Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- Other Surface Treatments For Metallic Materials (AREA)
Abstract
A magnesium alloy composite structure comprises a substrate, a porous passivation layer, a hole sealing layer, a conductive layer and a coating layer. The base material is composed of magnesium alloy, the porous passivation layer is formed on the surface of the base material and is composed of metal oxide formed by oxidizing magnesium alloy, the hole sealing layer is formed on the porous passivation layer, the conducting layer is composed of conducting material and is formed on the hole sealing layer, and the coating layer covers the surface of the conducting layer. The hole sealing layer can improve the problem of uneven surface of the porous passivation layer and reduce the peeling of the conductive layer and the coating layer. In addition, the conductive layer with conductivity is used as a medium, which is more beneficial to the formation of the coating layer and improves the adherence and the flatness of the coating layer. In addition, the invention also provides a manufacturing method of the magnesium alloy composite structure.
Description
Technical Field
The present invention relates to a composite structure and a method for manufacturing the same, and more particularly, to a magnesium alloy composite structure and a method for manufacturing the same.
Background
Since the portable electronic products are mainly demanded to be light, thin, short and small, light metals (such as titanium, magnesium and aluminum) with good mechanical strength and small specific gravity become common choices for manufacturing the portable electronic product housings, wherein magnesium alloy materials are emphasized by their excellent thermal conductivity and shock resistance.
Because the magnesium alloy has high activity and is easy to react with water vapor to generate local erosion, an oxide layer is usually formed on the surface of the magnesium alloy substrate, and the salt spray resistance of the magnesium alloy substrate is improved by utilizing the oxide layer, and meanwhile, the contact of the water vapor is avoided. However, since the oxide layer itself has a porous characteristic, the surface of the magnesium alloy substrate is visually lack of metallic luster and is not beautiful enough, so a masking layer is generally formed on the oxide layer to improve the appearance of the oxide layer, and the masking layer may be a paint layer or a metal layer formed by electrophoretic painting (ED).
However, the porous and uneven surface of the oxide layer results in poor adhesion between the oxide layer and the mask layer, and the non-conductive property of the oxide layer is not conducive to the formation of the mask layer by electroplating or electrophoresis. Therefore, it is one of the important points in the related industry to improve the problem of magnesium alloy that is easily corroded due to high activity and improve the adhesion between the shielding layer and the oxide layer to achieve the product appearance.
Disclosure of Invention
The invention aims to provide a magnesium alloy composite structure capable of reducing the influence of corrosion on a magnesium alloy.
The invention relates to a magnesium alloy composite structure. Comprises a substrate, a porous passivation layer, a hole sealing layer, a conductive layer and a coating layer.
The substrate is composed of magnesium or a magnesium alloy.
The porous passivation layer is provided with a body formed on the surface of the substrate and a plurality of holes formed downwards from one surface of the body far away from the substrate, and the body is made of metal oxide oxidized by magnesium or magnesium alloy.
The hole sealing layer is formed on the porous passivation layer.
The conductive layer is formed on the hole sealing layer and is made of a conductive material.
The coating layer is coated on the surface of the conducting layer and is selected from metal or nonmetal materials.
Preferably, the magnesium alloy composite structure of the present invention, wherein the total thickness of the porous passivation layer, the hole sealing layer, the conductive layer and the coating layer is 25 μm to 40 μm.
Preferably, the magnesium alloy composite structure of the present invention, wherein the conductive layer comprises at least one of graphene, a nanocarbon material or a metal.
Preferably, the magnesium alloy composite structure of the present invention, wherein the sealing layer is selected from siloxane resins, and the sealing layer is further filled in at least part of the pores.
Another objective of the present invention is to provide a method for manufacturing a magnesium alloy composite structure.
The manufacturing method of the magnesium alloy composite structure comprises a passivation step, a hole sealing step, a conductive layer forming step and a coating step.
The passivation step is to oxidize a substrate made of magnesium or magnesium alloy, and oxidize the substrate from the surface downwards through oxidation reaction to obtain a base material made of unreacted magnesium or magnesium alloy, and a porous passivation layer formed on the surface of the base material and made of metal oxide after magnesium or magnesium alloy is oxidized.
The hole sealing step is to coat a solution containing siloxane resin on the surface of the porous passivation layer to form a hole sealing layer.
The conductive layer forming step forms a conductive layer on the via sealing layer with a conductive material.
The coating step is to form a coating layer made of metal or nonmetal material on the conductive layer.
Preferably, the method for manufacturing a magnesium alloy composite structure of the present invention further includes a step of forming the substrate, wherein the substrate is formed by thixoinjection molding.
Preferably, in the manufacturing method of the magnesium alloy composite structure according to the present invention, the passivation step is to form the porous passivation layer by a micro-arc oxidation method.
Preferably, in the manufacturing method of the magnesium alloy composite structure of the present invention, the conductive layer is formed by coating, sputtering, chemical plating or electroplating.
Preferably, in the manufacturing method of the magnesium alloy composite structure according to the present invention, the coating step is to form the coating layer by electrophoretic coating or electroplating.
The invention has the beneficial effects that: the hole sealing layer is used for improving the problem of uneven surface of the porous passivation layer, and the conductive layer with conductivity and heat dissipation is used as a heat dissipation and conductive medium, so that the heat dissipation of the magnesium alloy composite structure can be improved, the formation of the coating layer can be facilitated, and the adherence and the flatness of the coating layer can be improved.
Drawings
FIG. 1 is a schematic view illustrating one embodiment of a magnesium alloy composite structure according to the present invention; and
FIG. 2 is a flowchart illustrating a method for fabricating a magnesium alloy composite structure according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of a magnesium alloy composite structure according to the present invention includes a substrate 1, a porous passivation layer 2, a hole sealing layer 3, a conductive layer 4 and a coating layer 5.
The substrate 1 is made of magnesium or magnesium alloy, in this embodiment, the substrate 1 is made of magnesium alloy selected from AZ31B magnesium alloy or AZ91D magnesium alloy, but not limited thereto.
The porous passivation layer 2 has a body 21 formed on the surface of the substrate 1 and a plurality of holes 22 formed downward from the surface of the body 21 away from the substrate 1, and the body 21 is made of a metal oxide oxidized by magnesium or magnesium alloy. The porous passivation layer 2 prevents the substrate 1 from being corroded by moisture from the air, and has salt fog resistance. The thickness of the porous passivation layer 2 is between 1 μm and 10 μm. Preferably, the thickness of the porous passivation layer 2 is between 4 μm and 8 μm. Alternatively, it is preferable that the thickness of the porous passivation layer 2 is between 1 μm and 2 μm, wherein the thinner the thickness of the porous passivation layer 2, the less the influence on the metallic luster of the substrate 1 caused by the surface irregularity.
The hole sealing layer 3 is selected from siloxane resin, is formed on the porous passivation layer 2, and is filled in at least part of the holes 22 of the porous passivation layer 2, so as to prevent acidic or alkaline solution from penetrating from the holes 22 to corrode the substrate 1 made of magnesium alloy, thereby providing further protection for the substrate 1. In some embodiments, the thickness of the sealing layer 3 is between 0.5 μm and 3 μm.
The conductive layer 4 is formed on the hole sealing layer 3 and is made of a conductive material. The conductive material comprises at least one of graphene, nano carbon material or metal, and the like, and has a thickness of 0.5-3 μm. Preferably, the conductive layer 4 is mainly made of graphene, and has good electrical and thermal conductivity.
The coating layer 5 is coated on the surface of the conductive layer 4, and the surface is smooth and the thickness is between 10 μm and 30 μm. In some embodiments, the coating layer 5 may be a metallic layer or a non-metallic layer, which may be a paint layer, for example, made of an electrophoretic paint.
In the embodiment, the total thickness of the porous passivation layer 2, the hole sealing layer 3, the conductive layer 4 and the coating layer 5 can be controlled within 25 μm to 40 μm, so that the magnesium alloy composite structure has a metal feeling and can improve salt spray resistance and heat dissipation.
Referring to fig. 2, the method for manufacturing the magnesium alloy composite structure of the embodiment sequentially includes a substrate forming step 61, a passivation step 62, a hole sealing step 63, a conductive layer forming step 64, and a coating step 65.
The substrate forming step 61 is to form the substrate with a predetermined shape and thickness by using magnesium or magnesium alloy (such as AZ31B magnesium alloy or AZ91D magnesium alloy) as a material and using injection molding or the like.
The substrate molding step 61 is described by way of example as a thixoinjection molding (thixomolding). When the substrate is formed in a thixotropic injection molding mode, heating and screw shearing are carried out on magnesium or magnesium alloy raw materials at the same time, so that the magnesium or magnesium alloy raw materials are in semisolid viscous slurry; then, the substrate with the predetermined shape and thickness can be obtained by injection molding, it should be noted that conditions of the related process parameters of thixo-injection molding are different according to different raw materials, and the adjustment of the process parameters is well known by those skilled in the related art, so that further description is omitted here. In addition, the substrate may have various shapes in terms of thickness, shape, etc. according to design requirements, and is not particularly limited.
The passivation step 62 is to oxidize the substrate from the surface to the bottom by oxidation reaction to obtain a base material 1 made of unreacted magnesium or magnesium alloy and a porous passivation layer 2 formed on the surface of the base material 1 and made of metal oxide of magnesium or magnesium alloy after oxidation.
Specifically, the passivation step 62 is to form the porous passivation layer 2 by a micro-arc oxidation method. In the implementation, the substrate is used as an anode end and is immersed into an electrolyte containing silicate, and then a continuous voltage with gradually increased voltage value is introduced to generate continuous discharge plasma reaction on the surface of the substrate, so that magnesium or magnesium alloy on the surface layer of the substrate is oxidized to form metal oxide, and the base material 1 which is formed by taking unreacted magnesium or magnesium alloy as a material and the porous passivation layer 2 which is formed on the surface of the base material 1 and is formed by metal oxide after magnesium or magnesium alloy is oxidized are obtained. Since the porous passivation layer 2 is a metal oxide formed by oxidizing magnesium or a magnesium alloy, and has insulation and excellent wear resistance, the wear resistance and insulation of the surface of the substrate 1 can be improved by using the porous passivation layer 2.
The sealing step 63 is to coat a solution containing siloxane resin on the surface of the porous passivation layer 2 to form the sealing layer 3. In the step 63 of sealing the pores, the solution containing the siloxane resin is formed on the porous passivation layer 2 by coating (for example, dip coating), and a part of the solution enters the pores 22; then baking at 120-150 ℃ to dry and harden to obtain the hole sealing layer 3.
The conductive layer forming step 64 is to form the conductive layer 4 made of a conductive material on the hole sealing layer 3.
In detail, the step 64 is to form the conductive layer 4 made of a conductive material on the hole sealing layer 3 by coating, sputtering, electroplating or electroless plating, wherein the conductive material includes at least one of graphene, nanocarbon material or metal.
The coating step 65 is to form the coating layer 5 made of a metal or non-metal material on the conductive layer 4.
In detail, the coating step 65 can be formed by depositing a conductive material or a charged colloid solution on the conductive layer 4 by electroplating or electrophoretic coating, so as to form the coating layer 5. In the present embodiment, the coating step 65 is to form the coating layer 5 by means of electrophoretic coating (ED). In the implementation, an electrophoretic fluid with charged colloid carrying pigment is prepared; and applying a voltage to deposit the colloid with charges in the electrophoretic solution on the surface of the conductive layer 4 under the action of the electric field, thereby obtaining the coating layer 5 with a smooth surface. It should be noted that the types of the coatings selected by the electrophoretic coating, the related process parameters, and the like are known in the related art, and are not described herein again.
The existing magnesium or magnesium alloy material can form a passivation coating (namely an oxidation layer carried by the background technology of the scheme or the porous passivation layer 2 of the scheme) for protecting the magnesium or magnesium alloy material through oxidation reaction so as to improve the salt fog resistance of the magnesium alloy base material and avoid the contact of water and gas. However, the passivation film has an uneven surface due to its porous characteristic, so that when a masking layer for improving the appearance is formed on the passivation film in the prior art, the masking layer is easily peeled off from the surface of the passivation film due to the uneven surface of the passivation film. Therefore, the present invention is utilized to dispose the sealing layer 3 on the porous passivation layer 2 to make the surface smoother. In addition, the sealing layer 3 can provide further protection to prevent the substrate 1 from decreasing in corrosion resistance due to the penetration of acidic or alkaline chemicals (e.g., electrolyte or electrophoretic fluid) from the holes 22 in the subsequent processes. In addition, since the porous passivation layer 2 and the hole sealing layer 3 have no conductivity, it is not favorable for the subsequent formation of the coating layer 5 by electrophoresis or electroplating. Therefore, the conductive layer 4 with conductivity is further formed on the hole sealing layer 3 as a medium, so that the coating layer 5 can be more easily formed by coating methods such as electroplating or electrophoresis, and the adhesion between the coating layer 5 and the conductive layer 4 is good. In addition, since the conductive layer 4 can provide good thermal conductivity, the magnesium alloy composite structure of the present invention can provide excellent heat dissipation efficiency when used as a housing of an electronic product.
In summary, the sealing layer 3 of the magnesium alloy composite structure of the present invention improves the surface unevenness of the porous passivation layer 2, so that the conductive layer 4 and the coating layer 5 can be attached to the sealing layer, thereby reducing the occurrence of peeling from the surface. In addition, the conductive layer 4 with conductive and heat dissipation properties is used as a medium, which is beneficial to forming the coating layer 5 by electrophoresis or electroplating, so as to improve the overall appearance and heat dissipation of the magnesium alloy composite structure, thereby achieving the purpose of the present invention.
It should be understood that the above description is only exemplary of the present invention, and that the scope of the present invention should not be limited thereby, and that the invention is intended to cover all modifications and equivalents of the claims and their equivalents.
Claims (9)
1. A magnesium alloy composite structure characterized by: comprises the following steps:
a base material composed of magnesium or a magnesium alloy;
the porous passivation layer is provided with a body formed on the surface of the base material and a plurality of holes formed downwards from one surface of the body far away from the base material, and the body is formed by taking magnesium or magnesium alloy oxidized metal oxide as a material;
a hole sealing layer formed on the porous passivation layer;
a conductive layer formed on the hole sealing layer and made of a conductive material; and
and the coating layer is coated on the surface of the conducting layer and is selected from metal or nonmetal materials.
2. The magnesium alloy composite structure of claim 1, wherein: the total thickness of the porous passivation layer, the hole sealing layer, the conductive layer and the coating layer is 25 μm to 40 μm.
3. The magnesium alloy composite structure of claim 1, wherein: the conductive layer includes at least one of graphene, a nanocarbon material, or a metal.
4. The magnesium alloy composite structure of claim 1, wherein: the hole sealing layer is selected from siloxane resin, and the hole sealing layer is also filled in at least part of the holes.
5. The manufacturing method of the magnesium alloy composite structure is characterized by comprising the following steps of: comprises the following steps:
a passivation step, in which a substrate made of magnesium or magnesium alloy is subjected to oxidation treatment, and the substrate is oxidized from the surface downwards through oxidation reaction to obtain a base material made of unreacted magnesium or magnesium alloy and a porous passivation layer formed on the surface of the base material and made of metal oxide oxidized by magnesium or magnesium alloy;
a hole sealing step, wherein a solution containing siloxane resin is coated on the surface of the porous passivation layer to form a hole sealing layer;
a conductive layer forming step of forming a conductive layer on the hole sealing layer with a conductive material; and
and a coating step of forming a coating layer made of a metal or nonmetal material on the conductive layer.
6. The method of making a magnesium alloy composite structure according to claim 5, wherein: the method also comprises a substrate molding step, wherein the substrate is formed by a thixo-molding mode.
7. The method of making a magnesium alloy composite structure according to claim 5, wherein: the passivation step is to form the porous passivation layer by a micro-arc oxidation method.
8. The method of making a magnesium alloy composite structure according to claim 5, wherein: the conductive layer is formed by coating, sputtering, chemical plating or electroplating.
9. The method of making a magnesium alloy composite structure according to claim 5, wherein: the coating step is to form the coating layer by electrophoretic coating or electroplating.
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| CN202011031462.1A CN114277366A (en) | 2020-09-27 | 2020-09-27 | Magnesium alloy composite structure and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011031462.1A CN114277366A (en) | 2020-09-27 | 2020-09-27 | Magnesium alloy composite structure and manufacturing method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298200A (en) * | 2007-04-30 | 2008-11-05 | 比亚迪股份有限公司 | Magnesium alloy composite material and preparation thereof |
| CN101376973A (en) * | 2007-08-28 | 2009-03-04 | 汉达精密电子(昆山)有限公司 | Vacuum sputtering and electrophoresis combined coating technology for processing micro-arc oxidation workpiece |
| CN104975292A (en) * | 2014-04-08 | 2015-10-14 | 通用汽车环球科技运作有限责任公司 | Method of preparing coating being anti-corrosion, having glossy appearance and used for light metal workpieces |
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2020
- 2020-09-27 CN CN202011031462.1A patent/CN114277366A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298200A (en) * | 2007-04-30 | 2008-11-05 | 比亚迪股份有限公司 | Magnesium alloy composite material and preparation thereof |
| CN101376973A (en) * | 2007-08-28 | 2009-03-04 | 汉达精密电子(昆山)有限公司 | Vacuum sputtering and electrophoresis combined coating technology for processing micro-arc oxidation workpiece |
| CN104975292A (en) * | 2014-04-08 | 2015-10-14 | 通用汽车环球科技运作有限责任公司 | Method of preparing coating being anti-corrosion, having glossy appearance and used for light metal workpieces |
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