CN109763159A - 2024 aluminium alloy anode oxide films of one kind and preparation method - Google Patents
2024 aluminium alloy anode oxide films of one kind and preparation method Download PDFInfo
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- CN109763159A CN109763159A CN201910204940.5A CN201910204940A CN109763159A CN 109763159 A CN109763159 A CN 109763159A CN 201910204940 A CN201910204940 A CN 201910204940A CN 109763159 A CN109763159 A CN 109763159A
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- aluminium alloy
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Abstract
The invention discloses a kind of 2024 aluminium alloy anode oxide films and preparation methods.The oxidation film is made of the porous layer continuously to become smaller close to the barrier layer of aluminum alloy surface and the aperture of critical electrolyte, and object is mutually by α-Al2O3With γ-Al2O3Structure composition.The present invention has the advantage that (1) 2024 aluminium alloy anode oxide film is by α-Al by the oxidation film that the pretreatment of 2024 aluminium alloys and anodic oxidation obtain2O3With γ-Al2O3Structure composition enhances the hardness and wearability of oxidation film；(2) porous layer of oxidation film be by aperture continuously become smaller it is porous constitute, the porosity of oxidation film is reduced, to increase its corrosion resistance；(3) preparation method of the invention is easy to operate, and environmental protection is friendly, at low cost, is easy to industrialize.
Description
Technical field
The present invention relates to electrochemical fields, and in particular to 2024 aluminium alloy anode oxide films of one kind and preparation method.
Background technique
2024 aluminium alloys have excellent mechanical strength, thermal conductivity, plasticity and formability, are widely used in automobile work
The fields such as industry, aerospace, electronic device, telecommunications.Aluminium is a kind of lower active metal of standard electrode potential, in air very
It is easy to oxidize, one layer of aluminum oxide film is formed, protects matrix not corroded to a certain extent.However, obtain in air
Aluminum oxide film is very thin and loose, directly results in poor antiseptic property.Therefore, in order to improve the corrosion resistance of aluminium alloy,
Surface treatment appropriate must be carried out to it.Currently, some surface modifying methods, such as anodized, electroplating technology, ion
Injection method etc. is very effective the mechanical property and corrosion resistance that improve aluminium alloy.In these techniques, anodic oxidation
Technology is considered as the most frequently used, most economical one of method.In anode oxidation process, aluminium alloy is made in corresponding electrolyte
For anode, under the action of impressed current, aluminum alloy surface forms layer oxide film, effectively improves the corrosion resistance of aluminium alloy
And mechanical property.The electrolyte of aluminium alloy anode oxide can use a variety of acid, such as sulfuric acid, chromic acid, oxalic acid.In these electrolyte
In, sulphuric acid anodizing is to prepare one of most common method of Process on Aluminum Alloy Oxidation Film.Anodizing process with sulfuric acid as major salt is simple, stablize,
It is easy to operate, 5 ~ 20 microns thick of colorless and transparent oxidation film can be obtained.However, the oxidation film that sulphuric acid anodizing technology obtains
Wearability is poor and porosity is higher, leads to relatively poor corrosion resistance.Compared with sulphuric acid anodizing, oxalic acid anodizing
Film has better wearability and lower porosity.However, the cost of oxalic acid anodizing technology is very expensive, generally compare sulphur
Acid is 3 ~ 5 times high.Chromic acid anodizing film is thinner than sulphuric acid oxidation coating, and piece surface can be made to keep original roughness.But chromic acid oxygen
Workpiece surface after change is softer, and wearability is poor, and chromic acid is harmful to environment and health.Meanwhile aluminium anode oxide film has very
High porosity and adsorption capacity are easy contaminated and corrosive medium and corrode.
Summary of the invention
In order to overcome the deficiencies in the prior art described above, the present invention provides a kind of 2024 aluminium alloy anode oxide films, the oxygen
Change film to be made of the porous layer continuously to become smaller close to the barrier layer of aluminum alloy surface and the aperture of critical electrolyte, object is mutually by α-
Al2O3With γ-Al2O3Structure composition；Meanwhile the present invention provides a kind of preparation methods for preparing the oxidation film.
A kind of preparation method of 2024 aluminium alloy anode oxide film, which is characterized in that specifically includes the following steps: one, it is pre-
Processing: 2024 aluminum alloy plate materials are polished, with 15% NaOH solution at 50 DEG C to plate degreasing 15 minutes, then 50%
Hydrofluoric acid clean 5 minutes, then through wash air-dry after it is spare；Two, anodic oxidation: being sun with pretreated 2024 aluminium alloy
Pole, pure aluminum plate are cathode, are stirred at 20 ~ 60 DEG C using compressed air, apply voltage in the electrolytic solution and carry out anodic oxidation；Its
Middle electrolyte are as follows: the concentrated sulfuric acid of 20 ~ 40 g/L, the tartaric acid of 80 ~ 100 g/L, the additive of 5 ~ 10 g/L；Apply alive side
Formula are as follows: first plus 2 ~ 10 min of DC voltage of 10 ~ 30 V, then voltage reduced with certain rate linear.
Compared with prior art, beneficial effects of the present invention are as follows:
(1) 2024 aluminium alloy anode oxide film is by α-Al2O3With γ-Al2O3Structure composition, enhance oxidation film hardness and
Wearability；
(2) porous layer of oxidation film be by aperture continuously become smaller it is porous constitute, the porosity of oxidation film is reduced, to increase
Its corrosion resistance；
(3) preparation method of the invention is easy to operate, environmentally friendly close friend, at low cost, is easy to industrialize.
The microcosmic knot of 2024 aluminium alloy anode oxide film prepared by the present invention is characterized using scanning electron microscope (SEM)
Structure is analyzed the object phase of oxidation film prepared by the present invention using X-ray diffraction technology (XRD), determines 5% using method of polarization curve
The antiseptic property of oxidation film in sodium chloride solution.
Detailed description of the invention
Fig. 1 is the SEM figure of oxidation film prepared by embodiment one, and oxidation film prepared by the present invention is by leaning on as shown in Figure 1
The porous layer composition that the nearly barrier layer of aluminum alloy surface and the aperture of critical electrolyte continuously become smaller.
Fig. 2 is the XRD curve graph of oxidation film prepared by embodiment one, it was demonstrated that the oxidation film of preparation is by α-Al2O3With γ-
Al2O3Phase structure composition.
Fig. 3 is the polarization curve of oxidation film prepared by embodiment one, as shown in Figure 3 oxidation film prepared by the present invention
Corrosion resistance it is strong.
Specific embodiment
Here is that in conjunction with specific embodiments, the present invention is further explained.These embodiments are merely to illustrate the present invention, but not
For limiting the scope of the invention.
Specific embodiment 1: a kind of preparation method of 2024 aluminium alloy anode oxide films, which is characterized in that specifically include
Following steps: one, it pre-processes: 2024 aluminum alloy plate materials being polished, with 15% NaOH solution at 50 DEG C to plate degreasing
15 minutes, then at hydrofluoric acid clean 5 minutes of 50%, then after washing and air-drying it is spare；Two, anodic oxidation: with pretreated
2024 aluminium alloys are anode, and pure aluminum plate is cathode, are stirred at 40 DEG C using compressed air, apply voltage in the electrolytic solution and carry out
Anodic oxidation；Wherein electrolyte are as follows: the concentrated sulfuric acid of 30 g/L, the tartaric acid of 90 g/L, the additive of 5 g/L；It applies alive
Mode are as follows: first plus 5 min of DC voltage of 18 V, then voltage 15min reduced with the rate linear of 1 V/min.
Specific embodiment 2: a kind of preparation method of 2024 aluminium alloy anode oxide films, which is characterized in that specifically include
Following steps: one, it pre-processes: 2024 aluminum alloy plate materials being polished, with 15% NaOH solution at 50 DEG C to plate degreasing
15 minutes, then at hydrofluoric acid clean 5 minutes of 50%, then after washing and air-drying it is spare；Two, anodic oxidation: with pretreated
2024 aluminium alloys are anode, and pure aluminum plate is cathode, are stirred at 20 DEG C using compressed air, apply voltage in the electrolytic solution and carry out
Anodic oxidation；Wherein electrolyte are as follows: the concentrated sulfuric acid of 20 g/L, the tartaric acid of 80 g/L, the additive of 5 g/L；It applies alive
Mode are as follows: first plus 2 min of DC voltage of 10 V, then 8 min of voltage reduced with the rate linear of 1 V/min.
Specific embodiment 3: a kind of preparation method of 2024 aluminium alloy anode oxide films, which is characterized in that specifically include
Following steps: one, it pre-processes: 2024 aluminum alloy plate materials being polished, with 15% NaOH solution at 50 DEG C to plate degreasing
15 minutes, then at hydrofluoric acid clean 5 minutes of 50%, then after washing and air-drying it is spare；Two, anodic oxidation: with pretreated
2024 aluminium alloys are anode, and pure aluminum plate is cathode, are stirred at 50 DEG C using compressed air, apply voltage in the electrolytic solution and carry out
Anodic oxidation；Wherein electrolyte are as follows: the concentrated sulfuric acid of 40 g/L, the tartaric acid of 100 g/L, the additive of 10 g/L；Apply voltage
Mode are as follows: first plus 5 min of DC voltage of 30 V, then 10 min of voltage reduced with the rate linear of 2 V/min.
Specific embodiment 4: a kind of preparation method of 2024 aluminium alloy anode oxide films, which is characterized in that specifically include
Following steps: one, it pre-processes: 2024 aluminum alloy plate materials being polished, with 15% NaOH solution at 50 DEG C to plate degreasing
15 minutes, then at hydrofluoric acid clean 5 minutes of 50%, then after washing and air-drying it is spare；Two, anodic oxidation: with pretreated
2024 aluminium alloys are anode, and pure aluminum plate is cathode, are stirred at 60 DEG C using compressed air, apply voltage in the electrolytic solution and carry out
Anodic oxidation；Wherein electrolyte are as follows: the concentrated sulfuric acid of 30 g/L, the tartaric acid of 100 g/L, the additive of 10 g/L；Apply voltage
Mode are as follows: first plus 10 min of DC voltage of 20 V, then 10 min of voltage reduced with the rate linear of 1 V/min.
Claims (2)
1. a kind of 2024 aluminium alloy anode oxide films, which is characterized in that the oxidation film by close to the barrier layer of aluminum alloy surface and
The porous layer composition that the aperture of critical electrolyte continuously becomes smaller, object is mutually by α-Al2O3With γ-Al2O3Structure composition.
2. a kind of 2024 aluminium alloy anode oxide film according to claim 1, which is characterized in that preparation method specifically wraps
It includes following steps: one, pre-processing: 2024 aluminum alloy plate materials are polished, it is de- to plate at 50 DEG C with 15% NaOH solution
Rouge 15 minutes, then at hydrofluoric acid clean 5 minutes of 50%, then after washing and air-drying it is spare；Two, anodic oxidation: after pretreatment
2024 aluminium alloys be anode, pure aluminum plate is cathode, stirred at 20 ~ 60 DEG C using compressed air, in the electrolytic solution apply electricity
Pressure carries out anodic oxidation；Wherein electrolyte are as follows: the concentrated sulfuric acid of 20 ~ 40 g/L, the tartaric acid of 80 ~ 100 g/L, 5 ~ 10 g/L's adds
Add agent；Apply alive mode are as follows: first plus 2 ~ 10 min of DC voltage of 10 ~ 30 V, then electricity reduced with certain rate linear
Pressure.
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| CN108893715A (en) * | 2018-07-27 | 2018-11-27 | 中国科学院合肥物质科学研究院 | The method that staged changes oxidizing potential preparation nanocone battle array SERS substrate |
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2019
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| TW343238B (en) * | 1994-11-16 | 1998-10-21 | Kobe Steel Ltd | Aluminum or aluminum alloy member for vacuum chamber, method of processing the surface of the member and material for the member |
| CN104593727A (en) * | 2014-12-24 | 2015-05-06 | 西安神光安瑞光电科技有限公司 | Method for preparing nano patterned substrate by utilizing AAO template |
| CN108893715A (en) * | 2018-07-27 | 2018-11-27 | 中国科学院合肥物质科学研究院 | The method that staged changes oxidizing potential preparation nanocone battle array SERS substrate |
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Application publication date: 20190517 |