CN105350052A - Preparation method for golden aluminum alloy conductive oxidation film - Google Patents
Preparation method for golden aluminum alloy conductive oxidation film Download PDFInfo
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- CN105350052A CN105350052A CN201510843843.2A CN201510843843A CN105350052A CN 105350052 A CN105350052 A CN 105350052A CN 201510843843 A CN201510843843 A CN 201510843843A CN 105350052 A CN105350052 A CN 105350052A
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- aluminum alloy
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- oxide film
- golden yellow
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Abstract
The invention relates to the technical field of aluminum alloy conductive oxidation films, in particular to a preparation method for a golden aluminum alloy conductive oxidation film. The preparation method comprises the steps that impurities are removed through gasoline; soaking is conducted through a sodium hydroxide solution for degreasing; washing is conducted, and soaking is conducted through a nitric acid solution for bright dipping; washing is conducted, and then anodic oxidation is conducted; and washing, dyeing, washing, drying, packaging and the like are conducted, and the compact protecting film is formed on the surface of an aluminum alloy material. Oxidation film holes are formed in the film, so that the color of the surface of the dyed aluminum alloy material is uniform, and the dyeing consistency of the aluminum alloy material is improved; in addition, the thickness of the oxidation film is 0.005-0.008 micrometer, the corrosion resistance of the aluminum alloy material is effectively improved, and it is guaranteed to the greatest extent that the conductivity of the aluminum alloy material is good, so that the surface contact resistance of the aluminum alloy material is 21.7-22.1 m omega.
Description
Technical field
The present invention relates to aluminium alloy electric conductive oxidation technical field of membrane, the preparation method of the golden yellow conductive oxide film of especially a kind of aluminium alloy.
Background technology
Aluminium is more active metal, and its standard potential is-1.706V, corrosion-resistant in atmospheric environment.In space industry is produced, be need aluminum to be added the strengthening effect that some micro-metalss improve aluminum, after increasing the intensity of aluminum, then it can be used as raw material to use; But along with the hardness of aluminum increases, its corrosion resistance nature reduces greatly, and then causes the work-ing life of aluminum shorter, affects the performance of equipment, causes potential safety hazard.
At present, under ensureing that aluminum alloy materials has enough intensity, there is higher corrosion resistance again, then need to carry out oxide treatment to aluminum alloy materials.
In prior art, chemical oxidation treatment and electrochemicial oxidation are divided into for the oxide treatment of aluminium alloy; And for the aluminum alloy materials applied in space industry, need to obtain aluminium alloy conductive protection, that is make the rete after processing namely want conductive energy, again in golden yellow, and color and luster needs uniformity.
But, the technology adopted according to prior art and oxidized aluminum alloy process producer and the product produced, it is all by after carrying out chemical oxidation treatment to aluminum alloy surface, makes the color and luster of film surface be rendered as irised rete; And also there is investigator to pass through to adopt electrochemicial oxidation to aluminum alloy surface, carried out dyeing process again, but due to treatment process Raw is chosen and the restriction of parameter inaccurate, cause the surface effect of the alloy product obtained poor, especially color and luster is poor, makes to need aluminum alloy material surface to be again processed into the difficulty of flavous conductive film layer larger.
In addition, oxidized aluminum alloy of the prior art, dyeing process, its due to the process in oxidized aluminum alloy treating processes incorrect, cause the thickness of the oxide film formed in aluminum alloy surface larger, and then make the resistance of aluminum alloy surface larger, make to level off to state of insulation, lose aluminium alloy conductivity; Moreover; in oxide film treating processes of the prior art; owing to not forming the dense porous state of uniformity at aluminium alloy protective layer; cause in dyeing course; be difficult to the color forming uniformity on surface; and then cause the color forming many color bands at aluminum alloy material surface, reduce the attractive in appearance of the aluminum alloy surface after dyeing process.
Based on this, this investigator is in conjunction with long-term exploration practice and constantly attempt, by the employing of electrochemicial oxidation mode, and the restriction to the physical and chemical parameter condition before electrochemicial oxidation, in process, after process, the aluminum alloy surface after processing is made to be flavous conducting film, reduce difficulty aluminum alloy material surface being prepared into flavous conducting film, for aluminum alloy material surface conductive protection provides a kind of new approaches.
Summary of the invention
In order to solve the above-mentioned technical problem existed in prior art, the invention provides the preparation method of the golden yellow conductive oxide film of a kind of aluminium alloy.
Be achieved particular by following technical scheme:
Gasoline decontamination, sodium hydroxide solution soaks degrease, and bright dipping is soaked in flushing, salpeter solution, rinses, carries out anodic oxidation again, and flushing, dyeing, rinse, dry up packaging;
Carrying out in treating processes, is adopt 120# gasoline as cleaning agent, after carrying out removing process to the greasy dirt of aluminum alloy surface; Be in the sodium hydroxide solution of 60 ~ 65g/l again at mass body volume concentrations by it, controlling sodium hydroxide temperature is after 60-70 DEG C of process 0.5-1min, then adopts the clean water of flowing clean; Be placed on after soaking 0.5-1min in salpeter solution again, adopt the clean water of flowing clean; It can be used as anode again, and carry out electrolytic oxidation process, the sulphuric acid soln of electrolytic solution to be mass body volume concentrations be 180-200g/l, the temperature of electrolytic solution is 13-15 DEG C, and the current density in electrolytic process is (0.5 ~ 0.8) A/dm
2, voltage is 13-15V, and electrolytic processing time is 4-6min; After electrolysis terminates, taken out, adopt the clear water of flowing to rinse well; Carried out dyeing process again, the temperature of staining fluid is 55-60 DEG C, and the treatment time is 1-2min, after having dyeed, adopts the clear water of flowing to rinse well, then is adopted pressurized air to be dried up on surface, packaging.The speed that pressurized air is produced by boasting is 1.5-3.7m
3/ h.
The salpeter solution of above-mentioned employing is 1: 1 mixing solutions mixed by nitric acid and water according to mass ratio.
Above-mentioned staining fluid be adopt concentration to be the sodium p-nitrobenzene-azo-salicylate of 0.25 ~ 0.3g/l and concentration to be the sodium alizarinsulfonate of 0.1 ~ 0.15g/l according to etc. mixing solutions after mass mixing; Anode aluminium alloy material flitch electrolysis completed during described dyeing process puts into staining fluid immersion treatment.
In the electrochemicial oxidation process of carrying out aluminum alloy materials, in fact the generation of the oxide film of aluminum alloy surface and the process of dissolving, in energising moment, because oxygen and aluminium have very large avidity, form rapidly aluminium sesquioxide oxide film at aluminum alloy material surface; Electrolyte solution again in conjunction with employing is sulphuric acid soln, and sulphuric acid soln all has the effect of dissolving to metallic aluminium and aluminium sesquioxide oxidation film layer, and then in whole electrochemicial oxidation process, there is following chemical reaction:
2Al+3H
2SO
4→Al
2(SO
4)
3+3H
2↑
Al
2O
3+3H
2SO
4→Al
2(SO
4)
3+3H
2O
Visible, in whole electrolytic process, there are electrochemical reaction and chemical reaction two processes.By the dissolution process of the oxide film in the generative process of the oxide film in electrochemical reaction and chemical reaction, make in the preparation process of aluminium alloy conductive shield, guarantee that the speed of growth is greater than dissolution rate, such conductive shield just can generate in aluminum alloy surface, and when the conductive shield of aluminum alloy surface reaches more than 0.02 micron, there are insulating property, and then cause the factor be selected in order to key of oxidation treatment time and treatment condition and raw material, its reason is: in chemical reaction, the environment be in for the concentration between each raw material, raw material is different, the time of process is different, it is in electrochemical oxidation reactions process, is all different in the speed of aluminum alloy surface formation aluminium sesquioxide oxide film and the thickness of generation, simultaneously, the oxidation film layer thickness formed in aluminum alloy surface is lower, the erosion resistance of aluminium alloy will be caused more weak, shorten the work-ing life of aluminum alloy materials equipment, based on this, this investigator is by generating the reaction of aluminium sesquioxide oxidation film layer and sulfuric acid dissolution aluminium sesquioxide oxidation film layer in electrochemical reaction, by the controlled oxidization time, the condition of electrochemical reaction and raw material choose with electrochemistry before, after treatment step, making to be formed thick at aluminum alloy material surface is 0.005 ~ 0.008 micron, aluminum alloy surface oxidation film layer is made to form porous state, and form comparatively fine and close oxide film protection layer in aluminum alloy surface, and then follow-up dyeing process can be adsorbed by aperture, by dye adsorption in aperture, and then obtain the color of required aluminum alloy materials.Make the uniform color at aluminum alloy material surface, improve the conductivity of aluminum alloy surface, prevent oxidation film layer to form the insulating property caused, make the contact resistance of aluminum alloy surface be 22m Ω; In addition, it according to the different demands of color, and then can also produce the product of different colours, improves the color diversification after aluminium alloy conductive protection.
Embodiment
Below in conjunction with concrete embodiment, further restriction is done to technical scheme of the present invention, but claimed scope is not only confined to done description.
Embodiment 1
The preparation method of the golden yellow conductive oxide film of a kind of aluminium alloy, after adopting gasoline to be cleaned up by the greasy dirt of aluminum alloy material surface, again aluminum alloy materials is placed in sodium hydroxide solution, the temperature controlling sodium hydroxide solution is 60 DEG C, after immersion treatment 0.5min, then adopted the clean water of flowing clean; After being adopted salpeter solution to soak 0.5min again, adopt the clean water of flowing clean; Carried out electrolytic oxidation process again, the positive terminal being placed in electrolyzer by aluminum alloy materials carries out electrolysis treatment, and the electrolytic solution in electrolytic process is sulfuric acid, and its concentration is 180g/l, and temperature is 13 DEG C, and current density is 0.5A/dm
2, voltage is 13V, and the treatment time is 4min; After having processed, then adopted the clean water of flowing clean; Adopted staining fluid to be 55 DEG C in temperature again and soaked 1min, then adopted the clean water of flowing clean, and adopted pressurized air to dry up packaging behind surface, can product be obtained.The speed that pressurized air is produced by boasting is 1.5-3.7m
3/ h.
The sodium p-nitrobenzene-azo-salicylate of described staining fluid to be concentration be 0.25g/l and concentration are the mixed solution after the mass mixings such as the sodium alizarinsulfonate of 0.1g/l.
Detect the surface contacted resistance of this product, it is 21.7m Ω, and the thickness of oxidation film layer is 0.005 micron.
Embodiment 2
A preparation method for the golden yellow conductive oxide film of aluminium alloy, adopts gasoline by aluminum alloy materials 1m
2after surperficial greasy dirt cleans up, then aluminum alloy materials is placed in sodium hydroxide solution, the temperature controlling sodium hydroxide solution is 70 DEG C, after immersion treatment 1min, then is adopted the clean water of flowing clean; After being adopted salpeter solution to soak 1min again, adopt the clean water of flowing clean; Carried out electrolytic oxidation process again, the positive terminal being placed in electrolyzer by aluminum alloy materials carries out electrolysis treatment, and the electrolytic solution in electrolytic process is sulfuric acid, and its concentration is 200g/l, and temperature is 15 DEG C, and current density is 0.8A/dm
2, voltage is 15V, and the treatment time is 6min; After having processed, then adopted the clean water of flowing clean; Adopted staining fluid to be 60 DEG C in temperature again and soaked 2min, then adopted the clean water of flowing clean, and adopted pressurized air to dry up packaging behind surface, can product be obtained.The speed that pressurized air is produced by boasting is 1.5-3.7m
3/ h.
Above-mentioned sodium hydroxide solution, its concentration is 60g/l; The mass percent of above-mentioned salpeter solution is 50%.
The sodium p-nitrobenzene-azo-salicylate of described staining fluid to be concentration be 0.3g/l and concentration are the mixed solution after the mass mixings such as the sodium alizarinsulfonate of 0.15g/l.
Detect the surface contacted resistance of this product, it is 22m Ω, and the thickness of oxidation film layer is 0.008 micron.Electronic Speculum figure observes, the uniform color on its surface, in golden yellow.
Embodiment 3
A preparation method for the golden yellow conductive oxide film of aluminium alloy, adopts gasoline by aluminum alloy materials 5m
2after surperficial greasy dirt cleans up, then aluminum alloy materials is placed in sodium hydroxide solution, the temperature controlling sodium hydroxide solution is 65 DEG C, after immersion treatment 0.8min, then is adopted clean water clean; After being adopted salpeter solution to soak 0.7min again, adopt clean water clean; Carried out electrolytic oxidation process again, the positive terminal being placed in electrolyzer by aluminum alloy materials carries out electrolysis treatment, and the electrolytic solution in electrolytic process is sulfuric acid, its concentration is 190g/l, and temperature is 14 DEG C, and current density is 0.7A/dm2, voltage is 14V, and the treatment time is 5min; After having processed, then adopted clean water clean; Adopted staining fluid to be 58 DEG C in temperature again and soaked 1.5min, then adopted clean water clean, and adopted pressurized air to dry up packaging behind surface, can product be obtained.
The sodium p-nitrobenzene-azo-salicylate of described staining fluid to be concentration be 0.28g/l and concentration are the mixed solution after the mass mixings such as the sodium alizarinsulfonate of 0.13g/l.
What above-mentioned gasoline adopted is 120# gasoline.
Above-mentioned sodium hydroxide solution, its concentration is 65g/l; The mass percent of above-mentioned salpeter solution is 50%.
Detect the surface contacted resistance of this product, it is 22.1m Ω, and the thickness of oxidation film layer is 0.007 micron.Adopt Electronic Speculum figure to observe, its surface color is consistent, in golden yellow.
Embodiment 4
A preparation method for the golden yellow conductive oxide film of aluminium alloy, adopts gasoline by aluminum alloy materials 10m
2after surperficial greasy dirt cleans up, then aluminum alloy materials is placed in sodium hydroxide solution, the temperature controlling sodium hydroxide solution is 60 DEG C, after immersion treatment 1min, then is adopted the clean water of flowing clean; After being adopted salpeter solution to soak 0.5min again, adopt the clean water of flowing clean; Carried out electrolytic oxidation process again, the positive terminal being placed in electrolyzer by aluminum alloy materials carries out electrolysis treatment, and the electrolytic solution in electrolytic process is sulfuric acid, its concentration is 180g/l, and temperature is 15 DEG C, and current density is 0.5A/dm2, voltage is 15V, and the treatment time is 4min; After having processed, then adopted the clean water of flowing clean; Adopted staining fluid to be 55 DEG C in temperature again and soaked 2min, then adopted the clean water of flowing clean, and packed after being adopted air blow drying surface, can product be obtained.
The sodium p-nitrobenzene-azo-salicylate of described staining fluid to be concentration be 0.25g/l and concentration are the mixed solution after the mass mixings such as the sodium alizarinsulfonate of 0.13g/l.
What above-mentioned gasoline adopted is 120# gasoline.
Above-mentioned sodium hydroxide solution, its concentration is 63g/l; The mass percent of above-mentioned salpeter solution is 50%.
Detect the surface contacted resistance of this product, it is 22.1m Ω, and the thickness of oxidation film layer is 0.006 micron.Adopt Electronic Speculum figure to observe, its surface color is consistent, in golden yellow.
Embodiment 5
The preparation method of the golden yellow conductive oxide film of a kind of aluminium alloy, after adopting gasoline to be cleaned up by the greasy dirt of aluminum alloy material surface, again aluminum alloy materials is placed in sodium hydroxide solution, the temperature controlling sodium hydroxide solution is 70 DEG C, after immersion treatment 0.5min, then adopted the clean water of flowing clean; After being adopted salpeter solution to soak 1min again, adopt the clean water of flowing clean; Carried out electrolytic oxidation process again, the positive terminal being placed in electrolyzer by aluminum alloy materials carries out electrolysis treatment, and the electrolytic solution in electrolytic process is sulfuric acid, its concentration is 200g/l, and temperature is 13 DEG C, and current density is 0.8A/dm2, voltage is 13V, and the treatment time is 4-6min; After having processed, then adopted the clean water of flowing clean; Adopted staining fluid to be 55 DEG C in temperature again and soaked 1min, then adopted the clean water of flowing clean, and packed after being adopted air blow drying surface, can product be obtained.
The sodium p-nitrobenzene-azo-salicylate of described staining fluid to be concentration be 0.28g/l and concentration are the mixed solution after the mass mixings such as the sodium alizarinsulfonate of 0.1g/l.
What above-mentioned gasoline adopted is 120# gasoline.
Above-mentioned sodium hydroxide solution, its concentration is 64g/l; The mass percent of above-mentioned salpeter solution is 50%.
Detect the surface contacted resistance of this product, it is 22.05m Ω, and the thickness of oxidation film layer is 0.0075 micron.Adopt Electronic Speculum figure to observe, its surface color is even, in golden yellow.
In addition, above-mentioned staining fluid is also replaced to the raw material of other color and lusters by this investigator, and then show that the color and luster of dyeing aluminum alloy material surface is out homogeneous, there will not be and have many color ribbons, namely can not present rainbow color, make the even dyeing of aluminum alloy material surface, quality is more excellent, especially through time that electrochemical reaction and chemical reaction balance each other a little, the concentration of temperature and electrolytic solution and voltage, the control of electric current, make to form some homogeneous spaces at aluminum alloy material surface, by the absorption in space, reach the object of even dyeing, but also be aluminum alloy material surface formed layer protecting film, this protective membrane is aluminium sesquioxide oxidation film layer, its thickness is between 0.005-0.008 micron, make when the corrosion preventing aluminum alloy materials, ensure that the conductivity of aluminum alloy materials, its surface contacted resistance is 21.7 ~ 22.1m Ω, conductivity is good.
Claims (10)
1. a preparation method for the golden yellow conductive oxide film of aluminium alloy, is characterized in that, by aluminum alloy materials by after gasoline degreasing, and clean water; After being placed on onium hydroxide solution degrease again, clean water; Be placed on after soaking 0.5-1min in salpeter solution again, clean water; It can be used as anode to be placed in electrolytic tank electrolysis oxidation again, the concentration of electrolyte in electrolyzer is the sulphuric acid soln of 180-200g/l, and its temperature is 13-15 DEG C, and electrolytic processing time is 4-6min, and electrolysis voltage is 13-15V, and electrolytic current density is 0.5-0.8A/dm
2, after electrolysis completes, clean water; Being placed on temperature is again soak 1-2min, clean water in the staining fluid of 55-60 DEG C; Dry up, packaging.
2. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, is characterized in that, described gasoline degreasing adopts 120# gasoline to carry out clean to the surface of aluminum alloy materials.
3. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, is characterized in that, described clean water, and it adopts the clear water of flowing to carry out clean.
4. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, it is characterized in that, described sodium hydroxide solution, its concentration is 60-65g/l.
5. the preparation method of the golden yellow conductive oxide film of the aluminium alloy as described in claim 1 or 4, it is characterized in that, described sodium hydroxide solution, its temperature is 60-70 DEG C.
6. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, it is characterized in that, described onium hydroxide solution degrease, it is that aluminum alloy materials is placed in sodium hydroxide solution immersion treatment 0.5-1min.
7. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, it is characterized in that, described salpeter solution, its mass percent is 50%.
8. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, it is characterized in that, described staining fluid, the sodium p-nitrobenzene-azo-salicylate of its composition of raw materials to be concentration be 0.25-0.3g/l is that the sodium alizarinsulfonate of 0.1-0.15g/l is according to the mixed solution waiting mass ratio to mix with concentration.
9. the preparation method of the golden yellow conductive oxide film of aluminium alloy as claimed in claim 1, it is characterized in that, described dries up, and it adopts the surface of air blow drying aluminum alloy materials.
10. the golden yellow conductive oxide film of aluminium alloy prepared by the preparation method of the golden yellow conductive oxide film of aluminium alloy as described in any one of claim 1-9, it is characterized in that, thickness is 0.005-0.008 micron, and surface contacted resistance is 21.7-22.1m Ω.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593377A (en) * | 2020-06-28 | 2020-08-28 | 宁波革创新材料科技有限公司 | Metallic silver elemental antibacterial aluminum alloy material and preparation method thereof |
| CN112695358A (en) * | 2020-11-25 | 2021-04-23 | 云南昆船机械制造有限公司 | Electrochemical conductive oxidation process method for aluminum and aluminum alloy |
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