CN109680328A - A method of electrophoretic coating and oxidation film are removed from aluminum or aluminum alloy product surface - Google Patents
A method of electrophoretic coating and oxidation film are removed from aluminum or aluminum alloy product surface Download PDFInfo
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- CN109680328A CN109680328A CN201910027295.4A CN201910027295A CN109680328A CN 109680328 A CN109680328 A CN 109680328A CN 201910027295 A CN201910027295 A CN 201910027295A CN 109680328 A CN109680328 A CN 109680328A
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- aluminum
- alloy product
- electrophoretic coating
- aluminum alloy
- oxidation film
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F5/00—Electrolytic stripping of metallic layers or coatings
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Paints Or Removers (AREA)
Abstract
The present invention relates to a kind of methods for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface, belong to electrophoretic techniques field.The purpose of the present invention is realized by following technical solution: a method of electrophoretic coating and oxidation film are removed from aluminum or aluminum alloy product surface, described method includes following steps: aluminum or aluminum alloy product is as cathode, stainless steel applies the electrophoretic coating of external direct current power supply removal aluminum or aluminum alloy product surface as anode in stripping paint bath liquid；Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, it is then that aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminum or aluminum alloy product of electrophoretic coating and oxidation film is completely exfoliated out.The present invention can not only reduce removing electrophoretic coating liquid medicine cost, moreover it is possible to improve the efficiency of removing electrophoretic coating, shortening is done over again the time.
Description
Invention field
The present invention relates to a kind of methods for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface, belong to electrophoresis
Technical field.
Background technique
Aluminium alloy has specific strength high, good thermally conductive and electric conductivity, reflective is strong, moulding is good, good moldability, without low temperature
The advantages that brittleness, processing performance are good, weather-resistance is strong, easy to form, cheap, is widely used in Hyundai Motor
Manufacturing industry and building material industry.After being especially surface-treated to aluminium and aluminum alloy electrophoresis, aluminium and Al alloy parts are provided with opposite biography
The stronger wearability of system anodic oxidation, corrosion resistance, alkali resistance.Electrophoresis process generates after being introduced into automobile exterior trimming parts industry
First anodic oxidation is coated with the novel process of one layer of electrodeposited paint film so that aluminum and aluminum alloy mateial not only have it is stronger acidproof
Alkalinity, while being also provided with that conventional oxidation is equally highlighted, gorgeous appearance.
Summary of the invention
The present invention in view of the above-mentioned problems existing in the prior art, proposes a kind of aluminum or aluminum alloy product done over again from needs
The method of sur-face peeling electrophoretic coating and oxidation film, this method can not only reduce removing electrophoretic coating liquid medicine cost, moreover it is possible to mention
The efficiency of height removing electrophoretic coating, shortening are done over again the time.
The purpose of the present invention is realized by following technical solution: a kind of to apply from aluminum or aluminum alloy product surface removing electrophoresis
The method of layer and oxidation film, described method includes following steps:
Aluminum or aluminum alloy product applies external direct current power supply in stripping paint bath liquid and goes as cathode, stainless steel as anode
Except the electrophoretic coating of aluminum or aluminum alloy product surface；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then
Aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Or Al-alloy products.
In process of production, the aluminium after electrophoresis and aluminium alloy part can have quality problems, and there are quality problems for these
Product is in the electrophoretic coating and oxidation film for return man-hour requirement removal surface.And surface is raw in process of production for full aluminium hanger
At electrophoretic coating and oxidation film must also remove, to reuse.At this stage with the liquid medicine for the release coating adopted mainly with acid
It is at high cost based on property solution, environment is polluted since solution concentration height be easy to cause acid mist.Therefore suitable removing electrophoresis is selected
The method of coating is particularly important to improve removing electrophoretic coating efficiency, reduce pollution and save the cost.Therefore this hair
It is bright using in anodic oxidation process electrochemical polish generate waste liquid as stripping paint bath liquid, on the one hand saved stripping paint liquid medicine at
This, on the other hand eliminates the processing cost of electrochemical polish waste liquid, so that production cost be greatly reduced.
In above-mentioned a kind of from the method that aluminum or aluminum alloy product surface removes electrophoretic coating and oxidation film, the stripping paint bath
Liquid is the waste liquid after electrochemical polish production, includes the component of following concentration: sulfuric acid: 300-500g/L in the stripping paint bath liquid,
Phosphoric acid: 700-900g/L, Al3+: 20-30g/L.By the aluminium, aluminium alloy and hanger of electrophoresis curing process, surface has one layer
The electrophoretic paint coating of acid and alkali-resistance, since it is with certain resistance to acid and alkali, so low voltage and high current is needed to puncture this tunic,
To which evolving hydrogen reaction occur at its surface defect, by it from product and hanger sur-face peeling, moreover, electrophoretic paint coating thickness is got over
Greatly, the processing time is longer, and voltage is higher.
In above-mentioned a kind of from the method that aluminum or aluminum alloy product surface removes electrophoretic coating and oxidation film, removal electrophoresis painting
External exhausting system when layer.Due to applying the effect of additional power source, evolving hydrogen reaction occurs on matrix to shell surface covering
From, but a large amount of hydrogen can be generated in cathode plate, so the hydrogen of generation is discharged using exhausting system, prevent density of hydrogen mistake
Gao Yuhuo explodes.
In above-mentioned a kind of from the method that aluminum or aluminum alloy product surface removes electrophoretic coating and oxidation film, removal electrophoresis painting
Applied voltage when layer is 30-40V, and time 7-10min, temperature is 80-90 DEG C.Apply voltage and time and temperature be by
What the coating layer thickness of aluminium, aluminium alloy and hanger determined, for specific matrix, different processing factors may be selected.
In above-mentioned a kind of from the method that aluminum or aluminum alloy product surface removes electrophoretic coating and oxidation film, the hydroxide
The concentration of sodium solution is 40-60g/L, and soaking time 2-3min, soaking temperature is 70-80 DEG C.It is attached on product surface
Oxidation film poorly conductive needs base extraction to remove it, product surface is exposed, and can just do over again.Hydrogen-oxygen
Change sodium tank liquor using the striping waste liquid in former anodic oxidation, is made a return journey oxide film dissolving using existing tank liquor, be effectively saved cost
And the time.When the temperature is low, it is enough to destroy the energy of hydrogen bond since molecule can not obtain, it can not extending and removing the time yet
Higher removal effect is obtained, as the temperature rises, molecule obtains enough energy, while molecular thermalmotion aggravates, and promotes
Hydrogen bond destroys, and the extension time can get higher removal rate, but temperature is excessively high, accelerates the volatilization of solvent, and destructible alkalinity is molten
The proportion of solvent in liquid, reduces the processing capacity of alkaline solution.
Preferably, also three second of the ethyl alcohol containing 0.25-0.35% and 0.12-0.20% in the sodium hydroxide solution
Hydramine.Ethyl alcohol and triethanolamine is added in the present invention in sodium hydroxide solution, if individually allowing waste magnesium alloy surface covering and hydrogen
Sodium hydroxide solution contact, the crosslinking curing due to coating Jing Guo height have formed fine and close space network, even if hydroxide
The penetration of sodium is extremely strong, it is also difficult to pass through this layer of fine and close reticular structure coating.The more high and low carbochain of ethyl alcohol boiling point and have pole
Property group, swelling appropriate can be carried out to coating, the segment appropriateness that swelling action asks dense coating reticular structure crosslinking points
Expanded, when space, which reaches sodium hydroxide, to be permeated into, since sodium hydroxide has stronger permeability and oxidation
Effect, can destroy the hydrogen bond action between coating and magnesium alloy substrates, and after the effect between coating and substrate is eliminated, coating just holds very much
Easily removed with substrate.And the triethanolamine in alkaline solution is a kind of basic nucleophilic solvent, is used as emulsifier, its energy
So that sodium hydroxide solution and ethanol solution is formed stable emulsion, it is preferably molten with alkalinity to facilitate waste magnesium alloy surface covering
Liquid contact, promotes the removal of coating.Meanwhile triethanolamine can participate in destroying the macromolecular chain of magnesium alloy substrates surface covering,
Accelerate the infiltration and swelling to coating.
Above-mentioned a kind of from the method that aluminum or aluminum alloy product surface removes electrophoretic coating and oxidation film, the sulfuric acid is molten
The concentration of liquid is 160-190g/L, soaking time 2-3min.Sulfuric acid solution can be used not only for removing remaining sodium hydroxide molten
Liquid, and the dust of energy removal rate, aluminium alloy and hanger surface, keep it more easy to fall off.
Above-mentioned a kind of from the method that aluminum or aluminum alloy product surface removes electrophoretic coating and oxidation film, the dry ice
Temperature is-79-- 78 DEG C.Dry ice pellet impacts motor fouled surfaces by dry ice cleaner, and dirt is made to be refrigerated to brittle cracking, shadow
The mechanical performance for ringing machine winding surface adhesion dirt behind dry ice shot boring dirt crack, gasifies in several signas,
It 600~800 times of volume moment, forms minor effect and answers, dirt is removed into object surface.The principle for the cleaning for carefully having concluded dry ice has two
Point: first is that the distillation of carbon dioxide moment is realized by the transfer of energy, second is that freezing dirt Dry ice cleaning under low temperature environment.
Compared with prior art, the present invention has the advantage that
1, on the one hand the waste liquid that the present invention is generated using electrochemical polish in anodic oxidation process is saved as stripping paint bath liquid
Stripping paint liquid medicine cost, on the other hand eliminates the processing cost of electrochemical polish waste liquid, so that production be greatly reduced
Cost.
2, control voltage, tank liquor temperature and tank liquor concentration can the strict control stripping paint time, improve production efficiency, shortening is returned
The time difference that work and hanger utilize again effectively improves order storage quantity on time.
3, it avoids using strong acid release coating, to generate photochemical fog, causes environmental pollution.
Figure of description
Fig. 1 is the attached drawing that the present invention removes electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface
Specific embodiment
The following is specific embodiments of the present invention, is described with reference to the drawings and further retouches to technical solution of the present invention work
It states, however, the present invention is not limited to these examples.
Fig. 1 is flow chart of the present invention, and aluminum or aluminum alloy obtains aluminium after polishing, anodic oxidation, electrophoresis cover paint or aluminium closes
Golden hanger, after testing, qualified products packaging factory, substandard product is by applied voltage stripping paint, soaking with sodium hydroxide and acid
It washes the processing of after-blow dry ice and recycles to obtain aluminum or aluminum alloy, wherein stripping paint bath liquid when applied voltage stripping paint is electricity in anodic oxidation process
The waste liquid that chemical polishing generates.
Embodiment 1
Using production, underproof aluminum or aluminum alloy product is as cathode after detecting, and stainless steel is as anode, in stripping paint bath
Apply the electrophoretic coating of external direct current power supply removal aluminum or aluminum alloy product surface in liquid under external exhausting system；The stripping paint bath
It include the component of following concentration: sulfuric acid: 300g/L, phosphoric acid: 700g/L, Al in liquid3+: 20g/L；Applied voltage is 30V, and the time is
7min, temperature are 80 DEG C；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then
Aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Or Al-alloy products, the concentration of the sodium hydroxide solution are 40g/L, soaking time 2min, soaking temperature is 70 DEG C, described
Also containing 0.25% ethyl alcohol and 0.12% triethanolamine in sodium hydroxide solution, the concentration of the sulfuric acid solution is 160g/
L, soaking time 2min, the temperature of the dry ice are -79 DEG C.
Embodiment 2
Using production, underproof aluminum or aluminum alloy product is as cathode after detecting, and stainless steel is as anode, in stripping paint bath
Apply the electrophoretic coating of external direct current power supply removal aluminum or aluminum alloy product surface in liquid under external exhausting system；The stripping paint bath
It include the component of following concentration: sulfuric acid: 350g/L, phosphoric acid: 750g/L, Al in liquid3+: 22g/L；Applied voltage is 32V, and the time is
8min, temperature are 82 DEG C；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then
Aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Or Al-alloy products, the concentration of the sodium hydroxide solution are 45g/L, soaking time 2.2min, soaking temperature is 72 DEG C, institute
It states also containing 0.28% ethyl alcohol and 0.14% triethanolamine in sodium hydroxide solution, the concentration of the sulfuric acid solution is
170g/L, soaking time 2.2min, the temperature of the dry ice are -78.2 DEG C.
Embodiment 3
Using production, underproof aluminum or aluminum alloy product is as cathode after detecting, and stainless steel is as anode, in stripping paint bath
Apply the electrophoretic coating of external direct current power supply removal aluminum or aluminum alloy product surface in liquid under external exhausting system；The stripping paint bath
It include the component of following concentration: sulfuric acid: 400g/L, phosphoric acid: 800g/L, Al in liquid3+: 25g/L；Applied voltage is 35V, and the time is
8.5min, temperature are 85 DEG C；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then
Aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Or Al-alloy products, the concentration of the sodium hydroxide solution are 50g/L, soaking time 2.5min, soaking temperature is 75 DEG C, institute
It states also containing 0.3% ethyl alcohol and 0.16% triethanolamine in sodium hydroxide solution, the concentration of the sulfuric acid solution is 175g/
L, soaking time 2.5min, the temperature of the dry ice are -78.5 DEG C.
Embodiment 4
Using production, underproof aluminum or aluminum alloy product is as cathode after detecting, and stainless steel is as anode, in stripping paint bath
Apply the electrophoretic coating of external direct current power supply removal aluminum or aluminum alloy product surface in liquid under external exhausting system；The stripping paint bath
It include the component of following concentration: sulfuric acid: 450g/L, phosphoric acid: 850g/L, Al in liquid3+: 28g/L；Applied voltage is 38V, and the time is
9min, temperature are 88 DEG C；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then
Aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Or Al-alloy products, the concentration of the sodium hydroxide solution are 55g/L, soaking time 2.8min, soaking temperature is 78 DEG C, institute
It states also containing 0.32% ethyl alcohol and 0.18% triethanolamine in sodium hydroxide solution, the concentration of the sulfuric acid solution is
180g/L, soaking time 2.8min, the temperature of the dry ice are -78.8 DEG C.
Embodiment 5
Using production, underproof aluminum or aluminum alloy product is as cathode after detecting, and stainless steel is as anode, in stripping paint bath
Apply the electrophoretic coating of external direct current power supply removal aluminum or aluminum alloy product surface in liquid under external exhausting system；The stripping paint bath
It include the component of following concentration: sulfuric acid: 500g/L, phosphoric acid: 900g/L, Al in liquid3+: 30g/L；Applied voltage is 40V, and the time is
10min, temperature are 90 DEG C；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then
Aluminum or aluminum alloy product is dry, and ice is dried up on its surface, it obtains to surface and the aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Or Al-alloy products, the concentration of the sodium hydroxide solution are 60g/L, soaking time 3min, soaking temperature is 80 DEG C, described
Also containing 0.35% ethyl alcohol and 0.20% triethanolamine in sodium hydroxide solution, the concentration of the sulfuric acid solution is 190g/
L, soaking time 3min, the temperature of the dry ice are -79 DEG C.
Embodiment 6
Difference with embodiment 3 is only that do not have external exhausting system in the embodiment when removing removing coating, other and reality
Apply that example 3 is identical, and details are not described herein again.
Embodiment 7
Difference with embodiment 3 is only that, does not contain ethyl alcohol in the embodiment in sodium hydroxide solution, other and embodiment
3 is identical, and details are not described herein again.
Embodiment 8
Difference with embodiment 3 is only that, does not contain triethanolamine in the embodiment in sodium hydroxide solution, other and reality
Apply that example 3 is identical, and details are not described herein again.
Comparative example 1
Difference with embodiment 3 is only that the comparative example does not carry out sur-face peeling electrophoretic coating and oxidation film process,
He is same as Example 3, and details are not described herein again.
Comparative example 2
Difference with embodiment 3 is only that the comparative example does not carry out electrophoretic process, other are same as Example 3, herein
It repeats no more,
Comparative example 3
Difference with embodiment 3 is only that the comparative example does not carry out soaking with sodium hydroxide processing, other and embodiment 3
Identical, details are not described herein again.
Comparative example 4
Difference with embodiment 3 is only that the comparative example does not carry out sulfuric acid immersion treatment, other are same as Example 3,
Details are not described herein again.
Comparative example 5
Difference with embodiment 3 is only that the comparative example does not carry out drying ice processing, other are same as Example 3, this
Place repeats no more.
The aluminum or aluminum alloy product that above-described embodiment 1-8 and comparative example 1-5 are obtained carries out performance detection, and testing result is such as
Shown in table 1:
Table 1: the performance test results for the aluminum or aluminum alloy product surface that embodiment 1-8 and comparative example 1-5 are obtained.
It can be seen from the results above that the waste liquid that the present invention is generated using electrochemical polish in anodic oxidation process is as stripping
On the one hand paint bath liquid has saved stripping paint liquid medicine cost, the processing cost of electrochemical polish waste liquid has on the other hand been eliminated, thus greatly
Amplitude reduces production cost.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, but simultaneously
Spirit or beyond the scope defined by the appended claims of the invention is not deviated by.
It is skilled to this field although present invention has been described in detail and some specific embodiments have been cited
For technical staff, as long as it is obvious for can making various changes or correct without departing from the spirit and scope of the present invention.
Claims (8)
1. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface, which is characterized in that the method
Include the following steps:
Aluminum or aluminum alloy product applies external direct current power supply in stripping paint bath liquid and removes aluminium as cathode, stainless steel as anode
Or the electrophoretic coating of aluminum alloy product surface；
Aluminum or aluminum alloy product after removal electrophoretic coating is successively immersed in sodium hydroxide solution, sulfuric acid solution, then by aluminium
Or Al-alloy products are dry, and dry up ice on its surface, obtain to surface and the aluminium or aluminium of electrophoretic coating and oxidation film is completely exfoliated out
Alloy product.
2. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 1,
It is characterized in that, the component including following concentration in the stripping paint bath liquid: sulfuric acid: 300-500g/L, phosphoric acid: 700-900g/L,
Al3+: 20-30g/L.
3. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 1,
It is characterized in that, applied voltage when removal electrophoretic coating is 30-40V, time 7-10min, temperature is 80-90 DEG C.
4. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 1,
It is characterized in that, external exhausting system when removal electrophoretic coating.
5. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 1,
It is characterized in that, the concentration of the sodium hydroxide solution is 40-60g/L, soaking time 2-3min, soaking temperature 70-80
℃。
6. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 5,
It is characterized in that, the also triethanolamine of the ethyl alcohol containing 0.25-0.35% and 0.12-0.20% in the sodium hydroxide solution.
7. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 1,
It is characterized in that, the concentration of the sulfuric acid solution is 160-190g/L, soaking time 2-3min.
8. a kind of method for removing electrophoretic coating and oxidation film from aluminum or aluminum alloy product surface according to claim 1,
It is characterized in that, the temperature of the dry ice is-79-- 78 DEG C.
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| CN201910027295.4A CN109680328A (en) | 2019-01-11 | 2019-01-11 | A method of electrophoretic coating and oxidation film are removed from aluminum or aluminum alloy product surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910027295.4A CN109680328A (en) | 2019-01-11 | 2019-01-11 | A method of electrophoretic coating and oxidation film are removed from aluminum or aluminum alloy product surface |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769068A (en) * | 1986-12-24 | 1988-09-06 | Aluminum Company Of America | Process for production of aluminum by carbothermic production of alkaline earth metal aluminide and stripping of aluminum from alkaline earth metal aluminide with sulfurous stripping agent |
| CN101210337A (en) * | 2006-12-29 | 2008-07-02 | 新疆众和股份有限公司 | Method for stripping oxide film of nano aluminum anode |
| CN108624946A (en) * | 2017-03-21 | 2018-10-09 | 上海铝通化学科技有限公司 | A kind of electrolysis stripping paint agent and stripping paint method |
-
2019
- 2019-01-11 CN CN201910027295.4A patent/CN109680328A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769068A (en) * | 1986-12-24 | 1988-09-06 | Aluminum Company Of America | Process for production of aluminum by carbothermic production of alkaline earth metal aluminide and stripping of aluminum from alkaline earth metal aluminide with sulfurous stripping agent |
| CN101210337A (en) * | 2006-12-29 | 2008-07-02 | 新疆众和股份有限公司 | Method for stripping oxide film of nano aluminum anode |
| CN108624946A (en) * | 2017-03-21 | 2018-10-09 | 上海铝通化学科技有限公司 | A kind of electrolysis stripping paint agent and stripping paint method |
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