CN202278782U - Corrosion-resistant composite coating on surface of magnesium alloy - Google Patents
Corrosion-resistant composite coating on surface of magnesium alloy Download PDFInfo
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- CN202278782U CN202278782U CN2011204354789U CN201120435478U CN202278782U CN 202278782 U CN202278782 U CN 202278782U CN 2011204354789 U CN2011204354789 U CN 2011204354789U CN 201120435478 U CN201120435478 U CN 201120435478U CN 202278782 U CN202278782 U CN 202278782U
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- magnesium alloy
- thermal spraying
- corrosion
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Abstract
The utility model discloses a corrosion-resistant composite coating on the surface of a magnesium alloy. The corrosion-resistant composite coating is arranged on a magnesium alloy substrate, wherein a thermal spraying metal or metal oxide coating is arranged on the outer surface of the magnesium alloy substrate; a silane modified organic coating is arranged on the surface of the metal or metal oxide coating; and a siloxane closing layer and a siloxane surface layer are arranged between the metal or metal oxide coating and the organic coating. According to the corrosion-resistant composite coating disclosed by the utility model, the problems of pore closing of the thermal spraying metal or metal oxide coating of the magnesium alloy as well as poor bonding force between the organic coating and the thermal spraying metal or metal oxide coating are solved; due to pretreatment by siloxane for multiple times, the porosity of the thermal spraying coating is effectively reduced and the bonding force between the organic coating as an outer layer and the metal or metal oxide coating as an inner layer is increased; and the silane modified organic coating forms a semi-interpenetrating network structure, so that the bonding force between the organic coating and the intermediate siloxane closing layer is further increased. The composite coating of the magnesium alloy has favorable corrosion resistance, wear resistance and weather resistance.
Description
Technical field
The utility model relates to a kind of magnesium alloy surface protective treatment technology, the composite coating of specifically a kind of Mg alloy surface metal or metal oxide hot-spraying coating and organic coating.
Background technology
Magnesium alloy is a lightest a kind of engineering structure metal material, have proportion is little, specific strength is high, good capability of electromagnetic shielding, vibration damping and damping capacity good, be easy to characteristics such as recycling.Magnesium alloy can be applicable to fields such as automobile, Aero-Space and 3C Product.But the chemical property of magnesium is active, and is anti-corrosion, wearability is relatively poor, needs usually can use after its surface forms layer of protecting coating through surface treatment.
Aluminium, zinc, allumen are easy to form the oxide-film with protectiveness in atmosphere and are widely used as the steel surface corrosion protective coating, like hydro-structure part, bridge, ocean engineering etc.In addition, the magnesium alloy wearability is poor, TiO
2, ZrO
2Can improve the anti-wear performance of magnesium alloy Deng coating of metal oxides.Adopt that thermal spraying comprises that plasma spraying, electric arc spraying, flame-spraying are ceramic coated in the metal surface, alloy, oxide etc. form wear-resistant coating.
But; The Mg alloy surface thermally sprayed coating contains higher porosity; There is bigger potential difference between coating and the matrix; In corrosive environment, be prone to produce galvanic corrosion and can not directly use, need carry out the surface-sealing processing and use the organic coating protection, to reach purpose anti-corrosion, wear-resisting, practical, attractive in appearance.
Present various organic coating has been widely used in metallic surface like alkyd, epoxy, acrylic acid, acid polyethylene and fluorocarbon coating etc. and has handled.For example, acrylic acid, fluorocarbon coating have good outdoor durable and corrosion resistance, have been applied to vehicle, bridge, steel construction, building etc.Yet the metal of organic coating and porous or metal oxide surface adhesion are relatively poor.
In order to improve the adhesion of organic coating and metal or metal oxide surface, often need carry out surface preparation to the metal surface.The siloxanes preliminary treatment has been applied to iron and steel, aluminium alloy or other metal material because can reinforcement metal and the combining of organic coating.In recent years, the siloxanes preliminary treatment also begins to be applied to Mg alloy surface.Zucchi etc. carry out silane pretreatment on magnesium alloy WE43 surface, form one deck and have the corrosion resistance protective layer.Patent (No.CN1936101A) points out that silane pretreatment can effectively reduce the corrosion rate of magnesium alloy.Patent (ZL200920294178.6) has been invented a kind of magnesium alloy anticorrosion new coating; This coating feature structure is: ground floor is a siloxanes preliminary treatment prime coat on magnesium alloy work-piece surface; The second layer also is a silicon coating, and the 3rd layer is polysiloxane-modified fluororine-carbon coating.Therefore, in order to improve anti-corrosion, the anti-wear performance of magnesium alloy in severe rugged environment, a kind of novel magnesium alloy composite coating of necessary research.
The utility model content
The purpose of the utility model is for corrosion resistance that improves Mg alloy surface and wearability; Improve the adhesion of organic coating and magnesium alloy thermal spraying metal or coating of metal oxides; A kind of Mg alloy surface metal or coating of metal oxides and organic coating composite coating are provided, to satisfy the aseptic technic needs of magnesium alloy in severe rugged environment.
The technical scheme of the utility model: a kind of Mg alloy surface anticorrosion composite coating; It is characterized in that; In the magnesium alloy substrate outside thermal spraying metal or coating of metal oxides are set; Be outside equipped with organic coating at metal or coating of metal oxides, siloxanes confining bed and siloxanes surface layer are set between metal or coating of metal oxides and organic coating.
Acrylic acid or fluororine-carbon coating have fabulous weatherability and corrosion resistance, through the silane-modified structure with semi-intercrossing network that forms, can improve the service life of magnesium alloy component open air.Thermal spraying metal or coating of metal oxides have loose structure, and the through hole in the coating is easy to cause magnesium alloy substrate and metal (like aluminium) or metal oxide (TiO
2) coating formation galvanic corrosion, quicken the corrosion of magnesium alloy on the contrary.Adopt dip-coating or brush metal or the coating of metal oxides that silane seals porous, on the one hand, improved the density of aluminium-plated coating surface, multiple tracks silane surface layer obviously improves corrosion resisting property; On the other hand, utilize silane coating and metal or metal oxide to form [Me
2O
3]
x[ySiO
2]
zStructure, silane coating can form good binding with silane-modified organic coating again.
When being provided with organic coating; Described organic coating is two roads or multiple tracks; Adopt the mode of brushing or spraying that organic coating is arranged on the Mg alloy surface outermost layer, further improved the adhesion and the corrosion resistance of organic coating and Mg alloy surface metal or coating of metal oxides.
The utility model has solved the problem that magnesium alloy thermal spraying metal or coating of metal oxides pore closure problem and organic coating combine difference with it; Reduced the porosity of thermal spraying metal or coating of metal oxides effectively through siloxanes preliminary treatment repeatedly; Improve the adhesion between outer organic coating and inner layer metal or the coating of metal oxides, improved the corrosion resistance and the wearability of magnesium alloy significantly.
With respect to prior art, the utlity model has following advantage:
1, corrosion resistance coating, weatherability, high abrasion resistance.Be provided with this composite coating of metal or coating of metal oxides and organic coating at Mg alloy surface; It is high to have overcome metal or coating of metal oxides porosity; The weakness that corrosion resistance is low has also overcome the shortcoming that the simple organic coating adhesion of Mg alloy surface is poor, intensity is low, the surface is prone to scratch destruction;
2, the whole adhesion of coating is good.Utilize magnesium and aluminium, zinc to be easy to the characteristics of counterdiffusion, formed metallurgical binding between magnesium alloy substrate and the metal coating; Utilize silane coating and silane-modified organic coating to improve the adhesion between organic coating and metal or the coating of metal oxides.
3, the erosion shield construction technology of this structure is comparatively simple, production efficiency is high, be applicable to comparatively abominable environment for use, is fit to large-scale production and applies.
Description of drawings
Mg alloy surface thermal spraying metal or coating of metal oxides/organic coating composite coating sketch map for the utility model.
Among the figure, 1-magnesium alloy substrate, 2-Mg/Al (Zn) diffusion layer, 3-metal or coating of metal oxides, 4-silane confining bed, 5-silane surface layer, the silane-modified organic coating of 6-.
The specific embodiment
Specify the concrete technical scheme of the utility model below in conjunction with accompanying drawing.
Embodiment 1: a kind of Mg alloy surface anticorrosion composite coating; Comprise magnesium alloy substrate 1; Outer surface at matrix 1 is provided with thermal spraying aluminum coating 3 and diffusion layer 2; Through front and back secondary siloxane treated, form silane confining bed 4 and silane surface layer 5, apply two layers of silane-modified acrylic acid coatings 6 in silane surface layer outside with half interpenetrating network structure.
The utility model adopts extrusion plate AZ31 Mg alloy surface is handled, but utilizes the characteristics of Mg/Al counterdiffusion, through heating, makes aluminized coating and magnesium alloy substrate form metallurgical binding, improves the adhesion between the two; It is acid coated to apply modified propylene then, the coating sample that obtains through the 1000h salt spray corrosion test, sample surfaces does not have bubbling, peels off phenomenon.This coating improves closure, corrosion resistance and the weather resistance of hot aluminium-plated coating significantly.
Embodiment 2: a kind of Mg alloy surface anticorrosion composite coating; Be arranged on magnesium alloy substrate 1; Outer surface at magnesium alloy substrate 1 is provided with thermal spraying spelter coating 3 and diffusion layer 2 thereof; Through three siloxane treated, form silane confining bed 4 and silane surface layer 5, apply three layers of fluorocarbon modified coating 6 of polysilane in silane surface layer outside with inierpeneirating network structure.
Described silane confining bed 4 plays the sealing of hole operation, and repeatedly silane surface layer 5 is handled and further improved sealing effect, has improved the adhesion of spelter coating and outer surface organic coating.This coating improves the corrosion resistance and the weather resistance of hot spray painted zinc coating significantly.
Embodiment 3: a kind of Mg alloy surface anticorrosion composite coating, be arranged on magnesium alloy substrate 1, and at the outer surface of magnesium alloy substrate 1 thermal spraying TiO is set
2 Coating 3 through the secondary siloxane treated, forms silane confining bed 4 and silane surface layer 5, applies two layers of fluorocarbon modified coating 6 of polysilane with inierpeneirating network structure in silane surface layer outside.
TiO
2After the sealing of coating surface silane, corrosion resisting property has improved 2 one magnitude.This composite coating improves wear-resisting, the corrosion resisting property of magnesium alloy significantly.
In above embodiment, Mg alloy surface metal (aluminium, zinc etc.) coating, metal oxide (TiO
2, ZrO
2, Al
2O
3Deng) employing thermal spraying mode is arranged on the magnesium alloy substrate, silane-modified organic coating 6 all adopts brushing or spraying method to be arranged on metal or the coating of metal oxides, this technology preparation method belongs to conventional means, does not detail at this.After the main purpose of the utility model is thermal spraying or brushing; Form the protective layer of aforesaid layer structure at Mg alloy surface; This protective layer has characteristics wear-resisting, anti-corrosion, weather-proof and that adhesion is good, can form long-term and effectively protection to magnesium alloy substrate.
Need to prove at last; Above embodiment is only in order to technical scheme but not the restriction technologies scheme of explanation the utility model; Although the applicant specifies the utility model with reference to preferred embodiment, those of ordinary skill in the art should be appreciated that those technical schemes to the utility model make amendment or be equal to replacement; And do not break away from the aim and the scope of present technique scheme, all should be encompassed in the middle of the claim scope of the utility model.
Claims (5)
1. Mg alloy surface anticorrosion composite coating; It is characterized in that; In magnesium alloy substrate (1) outside thermal spraying metal or coating of metal oxides (3) are set; Heating diffuses to form diffusion layer (2) between magnesium alloy substrate and thermal spraying metal coating, between metal or coating of metal oxides (3) and organic coating (6), siloxanes confining bed (4) and siloxanes surface layer (5) is set.
2. a kind of Mg alloy surface anticorrosion composite coating according to claim 1 is characterized in that described silicon coating comprises siloxanes confining bed (4) and siloxanes surface layer (5); Siloxanes confining bed (4) is arranged at magnesium alloy thermal spraying metal or metal oxide surface (3).
3. a kind of Mg alloy surface anticorrosion composite coating according to claim 1 is characterized in that described magnesium alloy thermal spraying metal is Al, Zn etc. and alloy thereof, and metal oxide is TiO
2, A1
2O
3, ZrO
2Deng.
4. a kind of Mg alloy surface anticorrosion composite coating according to claim 1 is characterized in that described siloxanes surface layer is two roads or multiple tracks.
5. a kind of Mg alloy surface anticorrosion composite coating according to claim 1 is characterized in that organic coatings (6) such as described silicone-modified epoxy, acrylic acid or fluorine carbon are two roads or multiple tracks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204354789U CN202278782U (en) | 2011-11-07 | 2011-11-07 | Corrosion-resistant composite coating on surface of magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204354789U CN202278782U (en) | 2011-11-07 | 2011-11-07 | Corrosion-resistant composite coating on surface of magnesium alloy |
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| Publication Number | Publication Date |
|---|---|
| CN202278782U true CN202278782U (en) | 2012-06-20 |
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ID=46224962
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204354789U Expired - Fee Related CN202278782U (en) | 2011-11-07 | 2011-11-07 | Corrosion-resistant composite coating on surface of magnesium alloy |
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| CN (1) | CN202278782U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741126A (en) * | 2013-12-20 | 2014-04-23 | 山东科技大学 | Preparation method of surface self-stratifying composite coating of magnesium alloy |
| CN104757857A (en) * | 2014-01-07 | 2015-07-08 | 无锡新大中薄板有限公司 | Manufacturing method of flocked carpet for oceanographic engineering |
| CN107794489A (en) * | 2016-08-29 | 2018-03-13 | 中兴通讯股份有限公司 | Magnesium alloy anti-corrosion method and anti-corrosion magnesium alloy member |
| CN109686558A (en) * | 2018-12-25 | 2019-04-26 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of high-corrosion resistance Sintered NdFeB magnet |
-
2011
- 2011-11-07 CN CN2011204354789U patent/CN202278782U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741126A (en) * | 2013-12-20 | 2014-04-23 | 山东科技大学 | Preparation method of surface self-stratifying composite coating of magnesium alloy |
| CN103741126B (en) * | 2013-12-20 | 2016-04-20 | 山东科技大学 | A kind of preparation method of Mg alloy surface self demixing compound coating |
| CN104757857A (en) * | 2014-01-07 | 2015-07-08 | 无锡新大中薄板有限公司 | Manufacturing method of flocked carpet for oceanographic engineering |
| CN104757857B (en) * | 2014-01-07 | 2016-05-04 | 无锡新大中薄板有限公司 | Be used for the manufacture method of the flocked carpet of ocean engineering |
| CN107794489A (en) * | 2016-08-29 | 2018-03-13 | 中兴通讯股份有限公司 | Magnesium alloy anti-corrosion method and anti-corrosion magnesium alloy member |
| CN109686558A (en) * | 2018-12-25 | 2019-04-26 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of high-corrosion resistance Sintered NdFeB magnet |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120620 Termination date: 20161107 |
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| CF01 | Termination of patent right due to non-payment of annual fee |