CN110484953A - A kind of preparation method of the high anti-corrosion differential arc oxidation film layer of aluminum alloy surface - Google Patents
A kind of preparation method of the high anti-corrosion differential arc oxidation film layer of aluminum alloy surface Download PDFInfo
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- CN110484953A CN110484953A CN201910783460.9A CN201910783460A CN110484953A CN 110484953 A CN110484953 A CN 110484953A CN 201910783460 A CN201910783460 A CN 201910783460A CN 110484953 A CN110484953 A CN 110484953A
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- Prior art keywords
- arc oxidation
- differential arc
- preparation
- film layer
- aluminum alloy
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
Abstract
The invention belongs to piece surface processing technology fields, more particularly to a kind of preparation method of the high anti-corrosion differential arc oxidation film layer of aluminum alloy surface, including preparing aluminum alloy differential arc oxidation solution, the organic oil removing of alloy product, differential arc oxidation is carried out using constant current-limited-voltage control mode, and cleaning drying is carried out to film surface.The present invention can generate one layer corrosion resistance is good, wearability is high, hardness is high etc. the good film layer of comprehensive performances in aluminium alloy outer surface, thicknesses of layers can be different with performance requirement and be controlled.The present invention carries out differential arc oxidation under constant current-pressure limiting mode, and the differential arc oxidation film layer consistency and corrosion resistance prepared are relatively high.Tank liquor formula proposed by the present invention is alkalescent, and environmental pollution is smaller.
Description
Technical field
The invention belongs to piece surface processing technology fields, and in particular to a kind of high anti-corrosion micro-arc oxidation films of aluminum alloy surface
The preparation method of layer.
Background technique
Since density is small, easy processing is widely used in type product aluminum alloy materials.In recent years, type product is high
Effect, highly reliable, long-life design fast development propose more corrosion-resistant, wear resistance of the key member under complex environment
Carry out higher requirement.Conventional fabrication processes mostly use hard anodising technique to handle the surface of aluminium alloy element, but
It is that the technical matters process is complicated, film layer need to can be only achieved corrosion resistant use demand by filling processing, and fill solution
In contain hexavalent chromium, do not meet the thinking of development of national environmental protection policy.Also have part by thermal spraying zirconium dioxide,
Titanium oxide film layer improves wear-resistant, corrosion resisting property, but the technique process is cumbersome, efficiency is lower and is limited by aluminium alloy fusing point
Narrow process window processed, also generally existing bond strength is low for made film layer, defect of easy damaged, to cannot play well
Wear-resistant anti-corrosion efficiency.It can be seen that traditional process for treating surface is improved, prepares efficient anticorrosion antiwear film layer,
Have become the key technology bottleneck that aluminium alloy element is reliably on active service in complex environment.
Differential arc oxidization technique is adjusted by the matching of electrolyte and electrical parameter, in the TRANSIENT HIGH TEMPERATURE high pressure that micro-arc discharge generates
Under effect, the ceramics for based on matrix element oxide, being aided with electrolyte component are grown in valve metal or its composite material surface
Film layer.Differential arc oxidization technique is grown up on the basis of anodizing technology, has the following characteristics that (1) workpiece surface produces
Raw arc discharge carries out high temperature, the HIGH PRESSURE TREATMENT of microplasma to oxide layer generated, to make amorphous oxide layer
It undergoes phase transition, optimize microstructure；(2) it can produce infiltration oxidation, i.e. oxygen ion permeation is into substrate, therefore oxide layer and substrate
Between exist thicker transition zone, both be in metallurgical bonding, oxidated layer thickness be much higher than hardening oxidation layer；(3) micro- electric arc participates in
Reaction makes oxide layer melting, is sintered and being formed has fine and close ceramic film；(4) ion added in solution may participate in film forming simultaneously
Change the performance of film, provides the flexibility of height for film performance regulation.It experienced local pyroreaction and molten process of quenching,
Ceramic coating formed by micro-arc oxidation hardness is high, consistency is high and is chemical inertness, therefore intrinsic with excellent wear-resisting, corrosion resisting property；This
Outside, since ceramic membrane is formed in situ in substrate, film substrate bond strength is high, and therefore, which is aluminium alloy element surfacecti proteon
Ideal chose.
Summary of the invention
(1) technical problems to be solved
The present invention proposes a kind of preparation method of high anti-corrosion differential arc oxidation film layer of aluminum alloy surface, micro- to solve how to improve
The technical issues of arc oxidation film layer performance.
(2) technical solution
In order to solve the above-mentioned technical problem, the present invention proposes a kind of preparation of high anti-corrosion differential arc oxidation film layer of aluminum alloy surface
Method, the preparation method include the following steps:
S1, aluminum alloy differential arc oxidation solution is prepared
Solution formula are as follows: main film forming agent Na2SiO3, concentration is 5~8g/L；Modifying agent NaAlO2, concentration be 0.05~
0.3g/L；Conductive agent KOH, concentration are 1~3g/L；Additive Na2WO4With Na2EDTA, concentration be respectively 0.3~2g/L, 0.5~
3g/L；
S2, organic oil removing: alloy product surface wipes are clean, and product is cleaned using deionized water；
S3, differential arc oxidation: alloy product being put into prepared microarc oxidation solution and carries out differential arc oxidation, the first rank
Section takes current constant control mode, and second stage takes pressure limiting mode；
After S4, differential arc oxidation film layer preparation, film surface is cleaned using deionized water, with compression after cleaning
Air blow drying.
Further, in step s 2, to dip in acetone or gasoline with cotton yarn clean by alloy product surface wipes.
Further, in step s3, power parameter when differential arc oxidation are as follows: positive negative current ratio 1:1, frequency 100Hz,
Positive duty ratio and negative sense duty ratio are respectively 50%；Oxidization time is 90min.
Further, in step s3, the first stage takes current constant control mode, when voltage rises to 515V, second-order
Section takes pressure limiting mode, and control voltage does not continue to increase.
(3) beneficial effect
The preparation method of the high anti-corrosion differential arc oxidation film layer of aluminum alloy surface proposed by the present invention, including prepare aluminum alloy differential arc
Solution is aoxidized, the organic oil removing of alloy product carries out differential arc oxidation using constant current-limited-voltage control mode, and to film surface
Carry out cleaning drying.
Beneficial effects of the present invention specifically include:
(1) present invention be directed to aluminum alloy part carry out micro-arc oxidation treatment after, one layer of corrosion resistance of outer Surface Creation it is good,
The good film layers of comprehensive performances such as wearability height, hardness height, thicknesses of layers can be controlled with performance requirement difference.
(2) present invention realizes the preparation to differential arc oxidation film layer, constant current-limit using a kind of constant current-limited-voltage control mode
Current density of the differential arc oxidation film layer prepared under die pressing type under same potential is significantly smaller, illustrates that its consistency improves, resistance to
Corrosive nature is relatively high, which can achieve the purpose that thicknesses of layers and consistency collaboration improve, thus further
Improve the corrosion resisting property of differential arc oxidation film layer.
(3) this method is a kind of environment-friendly type surface treatment method that environmental pollution is small.Matched by tank liquor proposed by the present invention
For the film layer just prepared in addition to good military service performance, solution used in entire technical process is alkalescent, environmental pollution
It is smaller.
Detailed description of the invention
Fig. 1 is the differential arc oxidation film layer that is obtained using preparation method of the embodiment of the present invention under different electrical power control model
SEM pattern photo: (a) constant current mode, (b) constant current-pressure limiting mode；
Fig. 2 is the table of the differential arc oxidation film layer that is obtained using preparation method of the embodiment of the present invention before and after salt air corrosion experiment
Surface state: (a) before salt mist experiment, (b) after salt mist experiment；
Fig. 3 is the surface shape of the differential arc oxidation film layer that is obtained using preparation method of the embodiment of the present invention before and after damp and hot experiment
State: (a) before damp and hot experiment, (b) after damp and hot experiment.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to tool of the invention
Body embodiment is described in further detail.
The present embodiment proposes that a kind of preparation method of high anti-corrosion differential arc oxidation film layer of aluminum alloy surface, the preparation method are specific
Include the following steps:
S1, aluminum alloy differential arc oxidation solution is prepared
Solution formula are as follows: main film forming agent Na2SiO3, concentration is 5~8g/L；Modifying agent NaAlO2, concentration be 0.05~
0.3g/L；Conductive agent KOH, concentration are 1~3g/L；Additive Na2WO4With Na2EDTA, concentration be respectively 0.3~2g/L, 0.5~
3g/L。
Wherein, main film forming agent is used to promote the formation of the initial oxidation film of matrix surface, induces spark discharge；Modifying agent is used for
Adjustment and the microstructure for changing film layer, can improve the surface quality of micro-arc oxidation films, make the smooth densification of film layer；Conductive agent is used
In improving coating growth rate, the conductivity of solution can also be improved；Additive is used to significantly improve the compactness of film layer and hard
Degree improves the wearability of film layer, and EDTA complex compound has stronger activation polarization effect and preferable dispersibility, can
Disperse uniform ion, to keep Film color uniform, there is the equally distributed effect of each component in adjustment film layer.
S2, organic oil removing: acetone or gasoline are dipped in cotton yarn alloy product surface wipes are clean, and uses deionized water
Product is cleaned.
S3, differential arc oxidation: alloy product is put into above-mentioned prepared room temperature microarc oxidation solution, and power supply is set
Parameter, power parameter are as follows: set positive negative current ratio as 1:1, frequency 100Hz, positive duty ratio and negative sense duty ratio are respectively
50%, oxidization time 90min, the first stage takes current constant control mode, and when voltage rises to 515V, second stage takes limit
Die pressing type, that is, control voltage do not continue to increase.It is synchronous in micro-arc oxidation process to open slot liquid cooling apparatus and stirring dress
It sets, to prevent tank liquor in micro-arc oxidation process to be rapidly heated, and then product is caused ablation situation occur.
After S4, differential arc oxidation film layer preparation, film surface is cleaned using deionized water, with compression after cleaning
Air blow drying.
SEM shape of the differential arc oxidation film layer obtained using preparation method of the embodiment of the present invention under different electrical power control model
Looks photo, as shown in Figure 1.As seen from Figure 1, using the cause of constant current-pressure limiting mode preparation 5A06 aluminum alloy differential arc oxidation film layer
Density is higher.
Fig. 2 and 3 is respectively that the differential arc oxidation film layer obtained using preparation method of the embodiment of the present invention is tested in salt air corrosion
Surface state before and after front and back and damp and hot experiment.As seen from the figure, differential arc oxidation film layer prepared by the present invention has very high salt resistance
Mist and hygrothermal environment performance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of preparation method of the high anti-corrosion differential arc oxidation film layer of aluminum alloy surface, which is characterized in that the preparation method includes
Following steps:
S1, aluminum alloy differential arc oxidation solution is prepared
Solution formula are as follows: main film forming agent Na2SiO3, concentration is 5~8g/L；Modifying agent NaAlO2, concentration is 0.05~0.3g/L；
Conductive agent KOH, concentration are 1~3g/L；Additive Na2WO4With Na2EDTA, concentration are respectively 0.3~2g/L, 0.5~3g/L；
S2, organic oil removing: alloy product surface wipes are clean, and product is cleaned using deionized water；
S3, differential arc oxidation: alloy product being put into prepared microarc oxidation solution and carries out differential arc oxidation, and the first stage adopts
Current constant control mode is taken, second stage takes pressure limiting mode；
After S4, differential arc oxidation film layer preparation, film surface is cleaned using deionized water, compressed air is used after cleaning
Drying.
2. preparation method as described in claim 1, which is characterized in that in the step S2, dip in acetone or gasoline with cotton yarn
Alloy product surface wipes are clean.
3. preparation method as described in claim 1, which is characterized in that in the step S3, power supply ginseng when differential arc oxidation
Number are as follows: positive negative current ratio 1:1, frequency 100Hz, positive duty ratio and negative sense duty ratio are respectively 50%；Oxidization time is
90min。
4. preparation method as described in claim 1, which is characterized in that in the step S3, the first stage takes constant current control
Molding formula, when voltage rises to 515V, second stage takes pressure limiting mode, and control voltage does not continue to increase.
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| CN201910783460.9A CN110484953A (en) | 2019-08-23 | 2019-08-23 | A kind of preparation method of the high anti-corrosion differential arc oxidation film layer of aluminum alloy surface |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608332A (en) * | 2008-06-19 | 2009-12-23 | 深圳富泰宏精密工业有限公司 | Aluminium alloy of surface tool ceramic coating formed by micro-arc oxidation and preparation method thereof |
| CN204530005U (en) * | 2015-01-28 | 2015-08-05 | 昆明电器科学研究所 | Constant current voltage limiting differential arc oxidation pilot circuit |
| CN106637337A (en) * | 2016-11-21 | 2017-05-10 | 广西大学 | Method for improving compactness of aluminum alloy micro-arc oxide coating |
-
2019
- 2019-08-23 CN CN201910783460.9A patent/CN110484953A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608332A (en) * | 2008-06-19 | 2009-12-23 | 深圳富泰宏精密工业有限公司 | Aluminium alloy of surface tool ceramic coating formed by micro-arc oxidation and preparation method thereof |
| CN204530005U (en) * | 2015-01-28 | 2015-08-05 | 昆明电器科学研究所 | Constant current voltage limiting differential arc oxidation pilot circuit |
| CN106637337A (en) * | 2016-11-21 | 2017-05-10 | 广西大学 | Method for improving compactness of aluminum alloy micro-arc oxide coating |
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