CN109837499A - A kind of surface treatment method improving corrosion resistance of aluminum alloy - Google Patents
A kind of surface treatment method improving corrosion resistance of aluminum alloy Download PDFInfo
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- CN109837499A CN109837499A CN201711204784.XA CN201711204784A CN109837499A CN 109837499 A CN109837499 A CN 109837499A CN 201711204784 A CN201711204784 A CN 201711204784A CN 109837499 A CN109837499 A CN 109837499A
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Abstract
The invention discloses a kind of surface treatment methods for improving corrosion resistance of aluminum alloy, blasting treatment, the foreign matter of removal aluminum alloy surface adherency and un-densified oxide skin are carried out to aluminum alloy surface first, so that aluminium alloy exposes fresh surface；Secondly the oxygen-enriched ion processing in high-temperature plasma surface is carried out to aluminum alloy surface using plasma spraying method, i.e., sprayed in conventional plasma with Ar and H2For O is added on the basis of plasma gas2, O2It ionization and reacts at high temperature with aluminium alloy, so that aluminum alloy surface forms fine and close corrosion-resistant Al2O3Film, to improve the corrosion resistance of aluminium alloy, the more traditional corrosion of aluminium alloy guard technology of the present invention has many advantages, such as efficient, low cost, pollutes without waste water and gas.
Description
Technical field
The present invention relates to a kind of aluminium alloy surface treatment methods, obtain densification Al especially for surface is enabled aluminum alloy to2O3Oxygen
Change the surface treatment method that film improves corrosion resistance of aluminum alloy.
Background technique
After aluminium content only occupy oxygen and element silicon in the earth's crust, account for about 8% of crust materials or more, is in non-ferrous metal
Usage amount is maximum, yield is most, most widely used metal material.China is aluminium production and consumption big country.Aluminium because have than
The advantages that weight is small, thermal conductivity is good, easy to process, cheap, is widely used to aerospace, communications and transportation, light industry building materials
Equal fields.However, three electronic structures that aluminium outer layer is unstable, make it embody active metallicity in corrosive medium.Though aluminium
It can so be acted on by self-passivation and to form oxidation film but the passivating film is more loose, be difficult to play the advantage of its corrosion resistance, this makes
Aluminium alloy potential danger in use is obtained to increase.
China has a vast territory, and coastline is up to tens of thousands of kilometers, Development of Marine economy, and exploitation marine resources build China's economy
Setting tool has great strategic significance.Aluminium alloy is with a wide range of applications in sea traffic, outer shell, yacht such as ship
Kayak body bottom, torpedo shell and torpedo water vat etc..Aluminium is more active one of the metal of chemical property, change of the environment for aluminium
Effect has an important influence the general corrosion of aluminium.In marine environment, since there are different degrees of sulfate, sulfurous acid
The pollutants such as salt and chloride, strengthen the corrosion reaction of aluminium and alloy.There are many forms for corrosion of the aluminium in marine atmosphere, such as
Stress corrosion, galvanic corrosion, crevice corrosion, local corrosion etc. are especially strong to the destruction of matrix.Due to being deposited in chloride ion
Marine environment in aluminum alloy surface easily corrode, this greatly limits the application ranges of aluminium alloy, so, how
Improving corrosion resistance of the aluminium alloy in the media such as seawater is always one of the important subject in relation to aluminium alloy.
Currently, being directed to aluminum alloy surface existing defect in terms of corrosive nature, surface treatment is one effective
Safeguard measure.The industrialized surface protection processing technique of aluminium alloy with most widely have chemical conversion, anodic oxidation, plating,
Chemical plating and organic polymer painting treatment etc..(1) chemical oxidization method: at a certain temperature, make metallic aluminium and oxidation solution
It chemically reacts, the technique of the insoluble oxidation film of passivation is generated in aluminum alloy surface, at chromic acid salt treatment, phosphorus chromate
Reason, but there are Cr VIs to the adverse effect of environment in the technology, it is more difficult to meet the requirement of environmental protection.(2) anodizing:
Anodic oxidation is the surface treatment of one kind " omnipotent " of aluminium, is using aluminum or aluminum alloy as anode in electrolytic process, in its table
Face generates the process of oxidation film, and aluminium surface generates porous anodic film after anodic oxidation, and oxidation film can be coloured
Processing usually carries out the sealing pores of perforated membrane, to obtain different functionalities and decoration to meet corrosion resisting property requirement
Property, but this method power consumption is huge, and it is at high cost.(3) organic matter painting treatment: application techniques includes brushing, dip-coating, spraying and electricity
The techniques such as swimming, but this method is easy to appear marine microorganism adherency in marine environment, increases the frictional force of hull and seawater.
(4) plating or chemical plating: plating or the available beautiful metal appearance of chemical deposit, but this method can not obtain large scale work
Part protection.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of surface treatment method for improving corrosion resistance of aluminum alloy,
Include the following steps:
(1) aluminum alloy surface is pre-processed, the foreign matter of removal aluminum alloy surface adherency and un-densified oxide skin；
(2) aluminium alloy for handling step (1) well carries out high-temperature plasma to aluminum alloy surface using plasma spraying method
The oxygen-enriched ion processing in surface；
Wherein, in the step (2), Plasma Spray Parameters are as follows: 60~120mm of spray distance, electric current 630~680A, Ar
Flow 45~65L/min, H2Flow 4~8L/min, O22~6L/min of flow, spray gun 300~600mm/s of rate travel, spraying
2000 DEG C of instantaneous high-temperature >.
In above-mentioned technical proposal, the step (1) pre-processes aluminum alloy surface, refers specifically to close aluminium with No. 46 emergies
Gold surface carries out blasting treatment.
Raising aluminum alloy corrosion resistant method employed in the present invention is high-temperature plasma process for treating surface, sprays wink
Between 2000 DEG C of high temperature >, using the active particle (charged particle, ultraviolet photon etc.) generated in plasma to aluminium alloy
Surface carries out Bombardment and cleaning, several atomic layers of adsorption is removed, to improve aluminum alloy surface chemical activity.Due to it is equal from
Sub- spray gun power is big, and plasma temperature is high, Conventional cryogenic plasma surface treatment is different from, in order not to damage aluminium alloy
Matrix, it is very fast that plasma gun is surface-treated rate travel.In the present invention, due to being filled with O2, make in high-temperature plasma
With lower O2Ionization occurs and reacts with aluminum alloy surface high activity Al atom, fine and close Al is formed in situ2O3Film.Due to high temperature
Contain a large amount of high-energy active particle in plasma, compared with conventional method, there is efficient, low cost, polluted without waste water and gas
The advantages that.
Detailed description of the invention
The aluminium alloy cross sectional scanning electron microscope photo of the Surface Treatment with Plasma of Fig. 1 embodiment 1；
In figure: 1. alloy matrix aluminums；2. the Al being formed in situ2O3Film；3. epoxy resin inlays sample object.
Specific embodiment
Preparation method of the invention is described further combined with specific embodiments below.
Embodiment 1
Blasting treatment, the foreign matter and un-densified oxygen of removal aluminum alloy surface adherency are carried out to aluminum alloy surface using No. 46 emergies
Change skin, so that aluminium alloy exposes fresh surface；It is rich that high-temperature plasma is carried out to aluminum alloy surface using plasma spraying technology
Oxonium ion surface treatment, surface treatment parameter are as follows: spray distance 60mm, electric current 630A, Ar flow 45L/min, H2Flow 4L/
Min, O2Flow 2L/min, spray gun rate travel 600mm/s.
Embodiment 2
Blasting treatment, the foreign matter and un-densified oxygen of removal aluminum alloy surface adherency are carried out to aluminum alloy surface using No. 46 emergies
Change skin, so that aluminium alloy exposes fresh surface；It is rich that high-temperature plasma is carried out to aluminum alloy surface using plasma spraying technology
Oxonium ion surface treatment, surface treatment parameter are as follows: spray distance 120mm, electric current 680A, Ar flow 65L/min, H2Flow
8L/min, O2Flow 6L/min, spray gun rate travel 300mm/s.
Embodiment 3
Blasting treatment, the foreign matter and un-densified oxygen of removal aluminum alloy surface adherency are carried out to aluminum alloy surface using No. 46 emergies
Change skin, so that aluminium alloy exposes fresh surface；It is rich that high-temperature plasma is carried out to aluminum alloy surface using plasma spraying technology
Oxonium ion surface treatment, surface treatment parameter are as follows: spray distance 70mm, electric current 640A, Ar flow 50L/min, H2Flow 5L/
Min, O2Flow 3L/min, spray gun rate travel 400mm/s.
Embodiment 4
Blasting treatment, the foreign matter and un-densified oxygen of removal aluminum alloy surface adherency are carried out to aluminum alloy surface using No. 46 emergies
Change skin, so that aluminium alloy exposes fresh surface；It is rich that high-temperature plasma is carried out to aluminum alloy surface using plasma spraying technology
Oxonium ion surface treatment, surface treatment parameter are as follows: spray distance 80mm, electric current 650A, Ar flow 55L/min, H2Flow 6L/
Min, O2Flow 4L/min, spray gun rate travel 500mm/s.
Embodiment 5
Blasting treatment, the foreign matter and un-densified oxygen of removal aluminum alloy surface adherency are carried out to aluminum alloy surface using No. 46 emergies
Change skin, so that aluminium alloy exposes fresh surface；It is rich that high-temperature plasma is carried out to aluminum alloy surface using plasma spraying technology
Oxonium ion surface treatment, surface treatment parameter are as follows: spray distance 100mm, electric current 660A, Ar flow 60L/min, H2Flow
7L/min, O2Flow 5L/min, spray gun rate travel 500mm/s.
Embodiment 6
Blasting treatment, the foreign matter and un-densified oxygen of removal aluminum alloy surface adherency are carried out to aluminum alloy surface using No. 46 emergies
Change skin, so that aluminium alloy exposes fresh surface；It is rich that high-temperature plasma is carried out to aluminum alloy surface using plasma spraying technology
Oxonium ion surface treatment, surface treatment parameter are as follows: spray distance 110mm, electric current 670A, Ar flow 60L/min, H2Flow
7L/min, O2Flow 6L/min, spray gun rate travel 600mm/s.
In above embodiments, using plasma spraying method to aluminum alloy surface carry out high-temperature plasma surface it is oxygen-enriched from
Subprocessing, spraying instantaneous high-temperature are greater than 2000 DEG C.
Claims (2)
1. a kind of surface treatment method for improving corrosion resistance of aluminum alloy obtains densification Al to enable aluminum alloy to surface2O3Oxidation
Film, which comprises the steps of:
Aluminum alloy surface is pre-processed, the foreign matter of removal aluminum alloy surface adherency and un-densified oxide skin；
The aluminium alloy that step (1) is handled well carries out high-temperature plasma body surface to aluminum alloy surface using plasma spraying method
The oxygen-enriched ion processing in face；
Wherein, in the step (2), Plasma Spray Parameters are as follows: 60~120mm of spray distance, electric current 630~680A, Ar
Flow 45~65L/min, H2Flow 4~8L/min, O22~6L/min of flow, spray gun 300~600mm/s of rate travel, spraying
2000 DEG C of instantaneous high-temperature >.
2. a kind of surface treatment method for improving corrosion resistance of aluminum alloy according to claim 1, which is characterized in that institute
It states step (1) to pre-process aluminum alloy surface, refers specifically to carry out blasting treatment to aluminum alloy surface with No. 46 emergies.
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| CN201711204784.XA CN109837499A (en) | 2017-11-27 | 2017-11-27 | A kind of surface treatment method improving corrosion resistance of aluminum alloy |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762321A (en) * | 2013-12-31 | 2014-04-30 | 刘键 | Organic device film encapsulation method and device |
| CN106319586A (en) * | 2015-06-17 | 2017-01-11 | 张家港华程机车精密制管有限公司 | Aluminum alloy hardened plating layer treatment process |
-
2017
- 2017-11-27 CN CN201711204784.XA patent/CN109837499A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762321A (en) * | 2013-12-31 | 2014-04-30 | 刘键 | Organic device film encapsulation method and device |
| CN106319586A (en) * | 2015-06-17 | 2017-01-11 | 张家港华程机车精密制管有限公司 | Aluminum alloy hardened plating layer treatment process |
Non-Patent Citations (2)
| Title |
|---|
| 刘爱国: "《低温等离子体表面强化技术》", 30 September 2015, 哈尔滨工业大学出版社 * |
| 李杨: "铝合金的等离子体氧化及其氧化层性能的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑(月刊)》 * |
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