CN107893251A - A kind of pre-treating method of 7 line aluminium alloy anodic oxidation - Google Patents
A kind of pre-treating method of 7 line aluminium alloy anodic oxidation Download PDFInfo
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- CN107893251A CN107893251A CN201711265215.6A CN201711265215A CN107893251A CN 107893251 A CN107893251 A CN 107893251A CN 201711265215 A CN201711265215 A CN 201711265215A CN 107893251 A CN107893251 A CN 107893251A
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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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/02—Light metals
- C23F3/03—Light metals with acidic solutions
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- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Disclosed by the invention is a kind of pre-treating method of 7 line aluminium alloy anodic oxidation, is comprised the following steps：A, pretreated aluminium alloy is passed through into degreasing；B, the progress throwing in the mixed solution of phosphoric acid (75% 80%) and sulfuric acid (20% 25%)；C, it is positioned in 30 DEG C 40 DEG C of 40 60g/L sodium hydroxide solution and cleans 10 20S；D, in and in solution carry out ash disposal in and；E, anodic oxidation is carried out in 180 200g/L sulfuric acid electrolytes, obtains the alloy matrix aluminum that surface forms uniform alumina film.Due to including high content zinc, magnesium, copper etc. in 7 line aluminium alloys, thicker dust can be produced after throwing by changing, and the dust of aluminum alloy surface can be eliminated using the method, prevent pollutionization from throwing solution and electrolytic solution, reduce loss, economical environment-protective.
Description
Technical field
The present invention relates to a kind of anodic oxidation preparation technology, more particularly, refers to a kind of 7 line aluminium alloy anodic oxidation
Pre-treating method, mainly for 7 series alloys higher with copper content.
Background technology
With the fast development of electronic casing product, intensity requirement more and more higher of the user for casing product.Traditional 6
The intensity of line aluminium alloy can not meet to require, develop 7 line aluminium alloys and have become trend as electronic casing.But high intensity
7 line aluminium alloys contain the elements such as the magnesium, zinc, copper of high content, according to three acid solution progress throwings, caused dust stratification is dissolved in
Change and throw in groove, influence the quality of product, also reductionization throws the service life of groove；According to two traditional acidifying throwing+sulfuric acid solutions
Ash disposal, effect is poor, and sulfuric acid solution is difficult to eliminate the dust stratification on surface, pollutes follow-up anode oxidation groove liquid.
For above technical problem, it is necessary to develop a kind of pre-treating method for the anodic oxidation for being directed to 7 line aluminium alloys, drop
The low pollution that solution and oxidation solution are thrown to changing, reduces production cost and environmental pollution.
The content of the invention
Caused dust stratification can have a strong impact on product quality and problem of environmental pollution during being thrown for 7 line aluminium alloyizations, this
The purpose of invention be propose a kind of environment-friendly type, low-cost type 7 line aluminium alloy anodic oxidations pre-treating method.In the present invention
Dust stratification is eliminated by adding alkali cleaning and neutralization step, it is reduced to changing the pollution thrown solution and aoxidize solution, avoids frequently more
Changing throws solution and oxidation solution, reduces production cost and environmental pollution.
To realize goal of the invention, the technical scheme is that：
A kind of pre-treating method of 7 line aluminium alloy anodic oxidation, comprises the following steps：
A, pretreated alloy matrix aluminum is passed through into ungrease treatment；The alloy matrix aluminum is 7 line aluminium alloy matrixes；
B, being positioned over of alloy matrix aluminum after ungrease treatment is thrown into progress throwing in solution, describedization, which throws solution, is：Phosphorus
Acid：Sulfuric acid=(75%-80%)：(20%-25%), change and throw temperature：95-100 DEG C, change and throw the time：80-100s, change throwing process
Alloy matrix aluminum is rotated along same direction；
C, 10-20S is cleaned in the alkali lye for the 40-60g/L that the alloy matrix aluminum changed after throwing is positioned over into 30 DEG C -40 DEG C；
D, the alloy matrix aluminum after cleaning is placed in neutralize in solution and neutralized, the neutralization solution is nitric acid：Sulfuric acid：
Water=(1.5-2.5):(2.5-3.5):(4.5-5.5), neutral temperature：20 DEG C -30 DEG C, neutralize the time：60-80s；
E, the alloy matrix aluminum after neutralization is subjected to anodic oxidation in sulfuric acid electrolyte, obtains surface and form uniform alumina
The alloy matrix aluminum of film.
Preferred scheme, the alkali lye are sodium hydroxide solutions.
Preferred scheme, the neutralization solution is nitric acid：Sulfuric acid：Water=2:3:5.
Preferred scheme, the concentration of the sulfuric acid electrolyte is 180-200g/L.
Preferred scheme, the content of the copper alloy of 7 line aluminium alloy is 0.8%-2%.
The present invention will be further explained below：
The present invention will not dissolve caused ash during 7 aluminium alloyings are thrown, pollutionization using sulfuric acid and phosphoric acid mixed solution
Throw solution.
It is the dust stratification of cupric caused by the present inventionization is main during throwing, can be quickly eliminated, made using high-temperature alkali solution
Aluminium alloy matrix surface cleans.
Neutralized using the neutralization solution of the present invention, can both eliminate remaining dust stratification during step c, can also rise
To the effect of neutralization, prevent from polluting anodic oxidation electrolyte.
Present invention is generally directed to the aluminium alloy of 7 serial cuprics, using this method can reduction throw dust stratification and throw solution to changing
With the pollution of oxidation tank liquor, ensure product quality, save production cost, reduce environmental pollution.
Compared with prior art, advantage of the invention is that：
The present invention uses two acid solution progress throwings, high-temperature alkali solution ash disposal, and sulfuric acid solution neutralizes, and the dust stratification on surface is complete
Remove it is clean, both will not pollution throwing tank liquor, do not interfere with the anodic oxidation quality of product yet.Therefore, carried out using the method
Processing, the quality of product can not only be improved, moreover it is possible to which raisingization throws the service life of tank liquor and anode oxidation groove liquid, reduces production
Cost and environmental pollution.
Embodiment
With reference to embodiment, the present invention is described further.
Changing caused dust stratification during throwing for 7 line aluminium alloys (wherein copper content is 1.2%-1.5%) can have a strong impact on
Product quality and problem of environmental pollution, the purpose of the present invention is to propose to a kind of environment-friendly type, low-cost type 7 line aluminium alloy anode
Method for oxidation.By the contrasts of three kinds of specific implementation cases, the advantages of determining this method and innovation.Three kinds of cases are both needed to obtain light
Damp degree is 20, and thickness is 15um product.
It is a kind of series alloys anode oxidation method of environment-friendly type 7 that the present invention, which provides, and its oxidation step is：
(1) substrate pretreated：
After alloy matrix aluminum mechanical grinding, polishing, sandblasting, ungrease treatment is carried out in degreasant solution；
(2) change and throw：
Alloy matrix aluminum is positioned over progress throwing in the mixed solution of phosphoric acid and sulfuric acid, changes and throws solution：Phosphoric acid：Sulfuric acid=
(75%-80%)：(20%-25%), change and throw temperature：95-100 DEG C, change and throw the time：80-100s, change throwing process along same side
To rotation alloy matrix aluminum；
(3) alkali cleaning：
Thicker dust stratification can be produced during throwing by changing, and be placed in high temperature sodium hydroxide solution and cleaned, can be with
The quick dust stratification for eliminating aluminium alloy matrix surface, concentration of sodium hydroxide solution：40-60g/L, temperature：30-40 DEG C, time 10-
20s.After having cleaned, the dust stratification on surface substantially eliminates totally；
(4) neutralize：
Alloy matrix aluminum after alkali cleaning is placed in neutralize and neutralized in solution, can both neutralize the alkali of matrix surface, also may be used
To eliminate remaining dust stratification, neutralization solution is nitric acid：Sulfuric acid：Water=2:3:5, temperature：Normal temperature, time：60-80s；
(5) anodic oxidation, sealing of hole
Alloy matrix aluminum after neutralization carries out anodized in sulfuric acid electrolyte, enters in the hole sealing solution of high temperature
Row sealing of hole, obtain the uniform matrix of anode oxide film.
Comparative example 1
Alloy product is polished, and -- mechanical polishing -- degreasing --- is placed on 95 DEG C, sulfuric acid after processing：Phosphoric acid：Nitric acid=
17:77:6 change, which throws to change in solution, throws 80-85S, and after washing, product surface is bright and clean, no dust stratification residual.Change the product after throwing to pass through
After anodized, it is 20 to obtain glossiness, and thickness is 15um product.After the lasting use of two weeks, discoveryization
Throw bottom land and obvious dust stratification layer be present.To avoid this dust stratification layer from influenceing the quality of product, it need to be changed, and will be acid molten
Liquid is handled, and cost is high and pollutes environment.
Comparative example 2
Alloy product is polished, and -- mechanical polishing -- degreasing --- is placed on 95 DEG C, sulfuric acid after processing：Phosphoric acid=1:4
Change to throw to change in solution and throw 110-120S, after washing, product surface has a thick layer dust stratification, then molten by 300g/L sulfuric acid
Liquid carries out neutralisation treatment, and the dust stratification of only fraction is eliminated, and product surface still dust stratification is serious.Neutralize the product warp after washing
After crossing anodized, it is 20 to obtain glossiness, and thickness is 15um product.After the lasting use of one month, find
Obvious dust stratification layer be present in anodic oxidation bottom land.To avoid this dust stratification layer from influenceing the quality of product, it need to be changed, and will
Acid solution is handled, and cost is high and pollutes environment.
Embodiment 1
Alloy product is polished, and -- mechanical polishing -- degreasing --- is placed on 95 DEG C, sulfuric acid after processing：Phosphoric acid=1:4
Change to throw to change in solution and throw 90S-100S, after washing, product surface has a thick layer dust stratification, then is positioned over 40 DEG C, 80g/L
Alkali cleaning 5-10S in sodium hydroxide solution, the dust stratification on surface is cleaned up.Neutralized, produced using 300g/L sulfuric acid solution
Product clean surface is bright, does not remain dust stratification.The product after washing is neutralized after anodized, obtaining glossiness is
20, thickness is 15um product.Using the method, caused dust stratification is dissolved into sodium hydroxide solution, to the quality of product
Influence unobvious.Therefore, this method both will not pollution throw solution, will not also pollute anode oxidation groove liquid, save environmental protection again.
In summary, for being also easy to produce dust stratification in 7 line aluminium alloy anodic oxidation pretreatment process the problem of, using the present invention
In preparation method, can significantly reduce dust stratification influences to caused by product quality and environmental pollution, both reduces production cost
With the utilization rate for improving tank liquor, also reduce and frequently change pollution of the tank liquor to environment.
Claims (5)
1. a kind of pre-treating method of 7 line aluminium alloy anodic oxidation, it is characterized in that, comprise the following steps：
A, pretreated alloy matrix aluminum is passed through into ungrease treatment；The alloy matrix aluminum is 7 line aluminium alloy matrixes；
B, being positioned over of alloy matrix aluminum after ungrease treatment is thrown into progress throwing in solution, describedization, which throws solution, is：Phosphoric acid：Sulphur
Acid=(75%-80%)：(20%-25%), change and throw temperature：95-100 DEG C, change and throw the time：80-100s, change throwing process along same
Individual direction rotates alloy matrix aluminum；
C, 10-20S is cleaned in the alkali lye for the 40-60g/L that the alloy matrix aluminum changed after throwing is positioned over into 30 DEG C -40 DEG C；
D, the alloy matrix aluminum after cleaning is placed in neutralize in solution and neutralized, the neutralization solution is nitric acid：Sulfuric acid：Water=
(1.5-2.5):(2.5-3.5):(4.5-5.5), neutral temperature：20 DEG C -30 DEG C, neutralize the time：60-80s；
E, the alloy matrix aluminum after neutralization is subjected to anodic oxidation in sulfuric acid electrolyte, obtains surface and form uniform alumina film
Alloy matrix aluminum.
2. the pre-treating method of 7 line aluminium alloy anodic oxidations according to claim 1, it is characterized in that, the alkali lye is hydrogen-oxygen
Change sodium solution.
3. the pre-treating method of 7 line aluminium alloy anodic oxidations according to claim 1, it is characterized in that, the neutralization solution is
Nitric acid：Sulfuric acid：Water=2:3:5.
4. the pre-treating method of 7 line aluminium alloy anodic oxidations according to claim 1, it is characterized in that, the sulfuric acid electrolyte
Concentration be 180-200g/L.
5. the pre-treating method of 7 line aluminium alloy anodic oxidations according to claim 1, it is characterized in that, 7 line aluminium alloy
The content of copper alloy is 0.8%-2%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711265215.6A CN107893251A (en) | 2017-12-05 | 2017-12-05 | A kind of pre-treating method of 7 line aluminium alloy anodic oxidation |
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| CN201711265215.6A CN107893251A (en) | 2017-12-05 | 2017-12-05 | A kind of pre-treating method of 7 line aluminium alloy anodic oxidation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023476A (en) * | 2018-08-17 | 2018-12-18 | 天长市京发铝业有限公司 | The method of aluminum substrate surface anodization processing |
| CN114959828A (en) * | 2022-06-16 | 2022-08-30 | 东莞市新东明科技有限公司 | Aluminum alloy anode process |
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| CN101845656A (en) * | 2009-11-24 | 2010-09-29 | 福建省闽发铝业股份有限公司 | Surface treatment process for high-gloss aluminum alloy drawing profiles |
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| CN106702456A (en) * | 2016-12-12 | 2017-05-24 | 惠州市至德精密部件有限公司 | Aluminum and aluminum alloy anodic oxidation nickel removing and hole sealing process |
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Patent Citations (8)
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| CN101649478A (en) * | 2008-08-14 | 2010-02-17 | 比亚迪股份有限公司 | Method and equipment for preparing material with multi-color oxide film on surface |
| CN101676439A (en) * | 2008-09-18 | 2010-03-24 | 浙江帝龙新材料股份有限公司 | Aluminum strip continuous anodic oxidation automatic production line |
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| CN104562136A (en) * | 2013-10-21 | 2015-04-29 | 广东澳美铝业有限公司 | Frosting process for aluminum profile |
| CN104975318A (en) * | 2014-04-02 | 2015-10-14 | 汉达精密电子(昆山)有限公司 | Die casting treatment method and product thereof |
| CN105525326A (en) * | 2014-12-22 | 2016-04-27 | 比亚迪股份有限公司 | Preparation method for aluminum alloy shell and aluminum alloy shell |
| CN106702456A (en) * | 2016-12-12 | 2017-05-24 | 惠州市至德精密部件有限公司 | Aluminum and aluminum alloy anodic oxidation nickel removing and hole sealing process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023476A (en) * | 2018-08-17 | 2018-12-18 | 天长市京发铝业有限公司 | The method of aluminum substrate surface anodization processing |
| CN114959828A (en) * | 2022-06-16 | 2022-08-30 | 东莞市新东明科技有限公司 | Aluminum alloy anode process |
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Application publication date: 20180410 |
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