CN1970844A - Aluminium basis material surface treatment method - Google Patents
Aluminium basis material surface treatment method Download PDFInfo
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- CN1970844A CN1970844A CN 200610172902 CN200610172902A CN1970844A CN 1970844 A CN1970844 A CN 1970844A CN 200610172902 CN200610172902 CN 200610172902 CN 200610172902 A CN200610172902 A CN 200610172902A CN 1970844 A CN1970844 A CN 1970844A
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Metallurgy (AREA)
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
As coating pretreatment of aluminiums base material, chemical conversion coating is usually process chromating. Whereas, Cr 6+ used in chromating is deemed to nocuousness in recent year, used unexpectly in environment, thereby needs seeking new method to replace chromating. As this replacement method, a non-chromating method is provided, but incapable of achieving the same sealant with coating and corrosion stability as chromating. Therefore, by improving surface cleanliness of aluminiums base material, even in non-chromating also capable of achieving the same or better sealant with coating and corrosion stability as chromating. This method is a aluminiums base material surface processing after coating pretreatment which has chemical conversion coating, using alkali aqueous solution or electrolyze water to process aluminiums base material before coating pretreatment.
Description
Technical field
The present invention relates to the surface treatment method of aluminium basis material.
Background technology
Tunicle, dirt, the wet goods that can adhere to aluminum oxide on the surface of aluminium base, it produces the adaptation of filming and hinders.Therefore, need remove above-mentioned tunicle or wet goods by the pre-treatment of coating before coating.
In addition, aluminium base is because erosion resistance is insufficient, if thereby exist to exist and scratch on the surface, then can produce filiform corrosion, form the shortcoming of oxide film on the surface easily, therefore need apply the processing that changes in the coating pre-treatment on the surface of aluminium base, thereby improve erosion resistance.In addition, change into processing, can improve aluminium base and the adaptation of filming by this.
Change into processing as this since with adaptation of filming and excellent corrosion resistance, therefore carry out chromate treating usually.Yet the 6 valency chromium ions that use in this chromate treating are considered to deleterious in recent years, and expectation is not used on environment.
Therefore, instead the non-chromate of above-mentioned chromate treating is handled, and has proposed for example pre-treatment of patent documentation 1 described coating.In the pre-treating process of this coating, the metal of 6 valency chromium ions has instead proposed the monometallic salt that is made of cobalt, zinc, titanium, silicon-dioxide, vanadium, cerium, molybdenum, tungsten, zirconium etc. or the combination of these salt.
Patent documentation 1: the spy opens the 2002-88492 communique
Summary of the invention
Though proposed to use above-mentioned metal etc. to handle, existed to obtain problem the same with 6 valency chromium ions and adaptation that film and erosion resistance as the non-chromate of the substitute of 6 valency chromium ions.
In addition, as the key element of the adaptation that influences aluminium basis material and film, can think as follows.
Behind casting aluminium basis material (for example aluminium wheel), carry out shot peening usually.The most shot-peenings of metal system (for example iron, stainless steel etc.) that use of this shot peening carry out, therefore the iron in the residual sometimes above-mentioned shot-peening in aluminium basis material surface after shot peening.
If this iron is residual, then become the key element that hinders aluminium basis material surface and the adaptation of filming, the moisture in the atmosphere etc. see through and film, and this moisture etc. and iron and as the reactive aluminum of base material become the reason that erosion resistance reduces.
In addition, form alumina coating on the surface of aluminium wheel, this alumina coating exerts an influence to aluminium wheel and the adaptation of filming.
Therefore, the purpose of this invention is to provide a kind of by improving the degree of cleaning on aluminium basis material surface, thereby improve aluminium basis material surface and the adaptation of filming, even in non-chromate is handled, aluminium basis material and the adaptation of filming and erosion resistance be the surface treatment method of the identical or aluminium basis material on it when carrying out chromate treating also.
In order to solve above-mentioned problem, the application provides following invention.
(1) a kind of surface treatment method of aluminium basis material, it is on aluminium basis material, after the pre-treatment of coating with the treatment process of changing into, the surface treatment method of the aluminium basis material that is coated with, it is characterized in that before aluminium basis material is carried out the pre-treatment of above-mentioned coating, handling by strong alkaline aqueous solution or alkali brine electrolysis.
(2) as the surface treatment method of (1) described aluminium basis material, the pre-treatment that it is characterized in that above-mentioned coating comprises degreasing or/and pickling and change into the operation of processing.
(3), it is characterized in that when handling aluminium basis material, applying ultrasonic wave by use strong alkaline aqueous solution or alkali brine electrolysis as the surface treatment method of (1) or (2) described aluminium basis material.
(4) as the surface treatment method of each described aluminium basis material of (1)～(3), it is characterized in that in the processing of being undertaken by above-mentioned strong alkaline aqueous solution or alkali brine electrolysis, be 1000～20000mg/m with respect to the etch quantity of above-mentioned aluminium basis material
2
(5) as the surface treatment method of each described aluminium basis material of (1)～(4), the pH that it is characterized in that above-mentioned strong alkaline aqueous solution is more than 12.0.
(6), it is characterized in that above-mentioned strong alkaline aqueous solution is aqueous sodium hydroxide solution or potassium hydroxide aqueous solution as the surface treatment method of each described aluminium basis material of (1)～(5).
(7) as the surface treatment method of each described aluminium basis material of (1)～(4), the pH that it is characterized in that above-mentioned alkali brine electrolysis is 10.5～11.7.
(8), it is characterized in that above-mentioned alkali brine electrolysis is the cathode solution that the electrolysis wet chemical generates as the surface treatment method of (1)～(4), (7) each described aluminium basis material.
(9) as the surface treatment method of each described aluminium basis material of (1)～(8), it is characterized in that using strong alkaline aqueous solution or alkali brine electrolysis to handle aluminium basis material after, carry out pickling, carry out the pre-treatment of above-mentioned coating then.
(10), it is characterized in that above-mentioned pickling is that acidic aqueous solution below 2 is handled by pH as the surface treatment method of (9) described aluminium basis material.
(11), it is characterized in that above-mentioned acidic aqueous solution is aqueous nitric acid or aqueous sulfuric acid as the surface treatment method of (10) described aluminium basis material.
(12), it is characterized in that above-mentioned aluminium basis material is the aluminium wheel as the surface treatment method of each described aluminium basis material of (1)～(11).
According to the present invention, before the pre-treatment of coating, handle by using strong alkaline aqueous solution or alkali brine electrolysis, thereby the surface of aluminium basis material is more cleaned, compare with the base material of the pre-treatment of only having carried out common coating (non-chromate processing), aluminium basis material is improved with adaptation, the erosion resistance of filming.Thus, aluminium basis material and adaptation of filming and erosion resistance and to carry out the base material of chromate treating identical, or on it.
This thinks because following key element causes.
It is believed that it is to handle by strong alkaline aqueous solution or alkali brine electrolysis, can remove substantially on the surface of aluminium basis material because the residual iron of shot-peening etc., a key element can getting rid of surface that hinders aluminium basis material and the adaptation of filming, therefore, can prevent that moisture etc. in the atmosphere from seeing through films, and causes the reduction of erosion resistance so that the aluminium of this moisture etc. and iron and base material reacts.
In addition, think, expose eutectic structure, form fine male and fomale(M﹠F) on the surface on the surface of aluminium basis material by using strong alkaline aqueous solution or alkali brine electrolysis that etching is carried out on the surface of aluminium basis material.Film by forming on this male and fomale(M﹠F), the surface of aluminium basis material is consolidated with the grow that combines of filming, and erosion resistance improves.
In addition, think, compare, more can remove the aluminum oxide film that forms on the surface of aluminium basis material, make the aluminium basis material surface more clean with common coating pre-treatment (non-chromate processing) by using strong alkaline aqueous solution or alkali brine electrolysis to handle aluminium basis material.
According to (3) described invention, further when using strong alkaline aqueous solution or alkali brine electrolysis to handle aluminium basis material, by applying ultrasonic wave, with do not carry out comparing by the method for ultrasonication, can promote the reaction of strong alkaline aqueous solution or alkali brine electrolysis and aluminium basis material, the surface of aluminium basis material is more cleaned.
According to the described invention in (9)～(11), further by pickling, can more positively remove de-iron etc., can prevent corrosive reduction.
Embodiment
Aluminium basis material as using among the present invention has no particular limits, and can enumerate for example aluminium base, aluminum alloy base material (for example AC-4C or AC-4CH) etc.The surface treatment method of aluminium basis material of the present invention can be suitable for the aluminium wheel.Below, to be suitable for example explanation the present invention of aluminium wheel.
After casting aluminium is taken turns, applied thermal treatment, carry out shot peening.Releasing agent when this shot peening is cast in order to remove the aluminium wheel etc. carries out, and uses shot blast particles made of iron to carry out.Therefore, residual sometimes above-mentioned shot blast particles (iron) on the surface of the wheel of the aluminium after the shot peening.If this iron is residual, then become the key element of the surface that hinders the aluminium wheel and the adaptation of filming, the moisture in the atmosphere etc. see through and film, and the iron of this moisture etc. and above-mentioned shot blast particles and as the reactive aluminum of base material becomes the reason that erosion resistance reduces.
By pH is more than 12.0, and preferred pH is that the strong alkaline aqueous solution more than 12.5 is handled the aluminium wheel that has carried out above-mentioned shot peening.As this strong alkaline aqueous solution, can enumerate for example aqueous sodium hydroxide solution, potassium hydroxide aqueous solution.In addition, except strong alkaline aqueous solution, can also use pH is 10.5～11.7 alkali brine electrolysis.As this alkali brine electrolysis, can enumerate for example electrolysis wet chemical in electrolyzer, the negative electrode liquid that generates at the cathode side of above-mentioned electrolyzer.
By this strong alkaline aqueous solution or alkali brine electrolysis, the aluminium wheel surface is carried out etching, above-mentioned shot blast particles (iron) al dissolution on every side that the aluminium wheel surface is residual exposes iron at the aluminium wheel surface, is removed.
Etch quantity with respect to the aluminium wheel in this processing is 1000～20000mg/m
2, be preferably 1000～5000mg/m
2
In addition, by strong alkaline aqueous solution or alkali brine electrolysis, will remove attached to the tunicle of the aluminum oxide of aluminium wheel surface.With degreasing and the pickling in the present coating pre-treatment, to removing of this alumina coating is inadequate, but in the present invention, use has than strong alkaline aqueous solution or the alkali brine electrolysis of the higher pH of degreasing in the coating pre-treatment to be handled, because the etch quantity of taking turns with respect to this aluminium is 1000～20000mg/m
2High like this, therefore can fully remove the aluminium film.
In addition, can also remove machinery oil, cutting wet goods organic impurity that the aluminium wheel surface adheres to, improve the degree of cleaning of aluminium wheel surface.
In addition, when handling,, thereby promote reaction preferably by carrying out ultrasonication by this strong alkaline aqueous solution or alkali brine electrolysis.This is that the effect of the microvibration that produced by ultrasonic wave, stirring, deaeration, cavitation erosion etc. is obtained.
After handling, wash processing by above-mentioned strong alkaline aqueous solution or alkali brine electrolysis.Preferred this washing is handled and is carried out more than 2 times.Thus, make reaction stop by dilution strong alkaline aqueous solution or alkali brine electrolysis.In addition, handle, also have the effect that the treatment dosage that makes the above-mentioned operation that operation after this carries secretly reduces by this washing.
Then, be below 2.0 by pH, preferred pH is that the acidic aqueous solution below 1.5 is handled the aluminium wheel.As acidic aqueous solution, can enumerate for example nitric acid and sulfuric acid etc.By this acidic aqueous solution, in and the residual above-mentioned basic treatment agent of aluminium wheel surface.If this is owing at the residual alkaline treatment agent of aluminium wheel surface, then can reduce with the adaptation of filming.In addition, can fully remove owing to above-mentioned shot peening operation and at the residual iron of aluminium wheel surface.
After handling, wash processing by above-mentioned acidic aqueous solution.Preferred this washing is handled and is carried out more than 2 times.Thus, make reaction stop by the dilution acidic aqueous solution.In addition, handle, also have the effect that the treatment dosage that makes the above-mentioned operation that operation after this carries secretly reduces by this washing.
Then, the pre-treatment that is coated with.The pre-treatment of this coating by skimming treatment, cleanup acid treatment, change into processing, aftertreatment constitutes.Wash processing at each inter process.In addition, can also not carry out aftertreatment.
Skimming treatment is at first carried out in the pre-treatment of above-mentioned coating.As this skimming treatment, there is no particular limitation, and the method for using in can handling according to common aluminium wheels such as alkali degreasing washings is carried out.By this skimming treatment, can remove oil material, or rise to the surface.In addition, the acidic aqueous solution that uses in the cleanup acid treatment of carrying out is improved with respect to the wetting property of aluminium wheel afterwards, can more positively carry out pickling.
After above-mentioned skimming treatment, wash processing.Preferred this washing is handled and is carried out more than 2 times.Thus, make reaction stop by the treatment agent that uses in the dilution skimming treatment.In addition, handle, also have the effect of the treatment dosage that reduces the above-mentioned operation that operation after this carries secretly by this washing.
Then, carry out cleanup acid treatment.As this cleanup acid treatment, can carry out according to the method for in the coating pre-treatment with non-chromate processing of aluminium wheel, using.By this pickling, can remove the dirt and the oxide film of aluminium wheel surface.In addition,, can make the activation of aluminium wheel surface, form easily and change into film by pickling.
After above-mentioned cleanup acid treatment, wash processing.Preferred this washing is handled and is carried out more than 2 times.Thus, make reaction stop by being diluted in the treatment agent that uses in the cleanup acid treatment.In addition, handle, also have the effect that the treatment dosage that makes the above-mentioned operation that operation after this carries secretly reduces by this washing.
Follow the aftertreatment of handling with as required by changing into, thereby change into film in the formation of aluminium wheel surface.Change into as this and to handle and aftertreatment, can open 2003-313681 communique, spy according to the spy and open the method that the non-chromate that uses in the aluminium wheel coating pre-treatment of 2003-27253 communique record etc. handles and carry out.In non-chromate is handled, the metal of 6 valency chromium ions instead, the composite metal salt that has proposed to use the monometallic salt that constitutes by cobalt, zinc, titanium, silicon-dioxide, vanadium, cerium, molybdenum, tungsten, zirconium etc. or these metallic combinations to form, as this salt, use vitriol, phosphoric acid salt, nitrate, fluorate, chlorate, aluminium salt, acetate etc.
Then, wash processing.Preferred this washing is handled and is carried out more than 2 times.
Then, by air advertise etc. remove moisture after, remove the moisture drying.
Then, be coated with on the surface of aluminium wheel.As this coating process, can carry out according to having applied the common coating process that uses in the surface-treated aluminium wheel with non-chromate processing.
Embodiment
Next, by embodiment the present invention is carried out specific description.
[embodiment 1]
Use aluminium alloy to come moulding aluminium wheel, from mould, take out the aluminium wheel, after heat-treating, carry out shot peening, afterwards, carry out the operation of following (1)～(18) successively, obtain the coating thing of aluminium wheel.
(1) strong alkaline aqueous solution is handled
Treatment solution: 5% (w/v) sodium hydroxide (pH13.1)
Treatment temp: 40 ℃
Treatment time: 150 seconds
Etch quantity: 2500mg/m
2
(2) washing is * 2 times
(3) acidic aqueous solution is handled
Treatment solution: 5～10% (w/v) nitric acid (pH1.5 is following)
Treatment temp: 30 ℃
Treatment time: 30 seconds
(4) washing is * 2 times
(5) hot water wash
(6) skimming treatment
Treatment solution: 3% (w/v) Surfcleaner C294 (Japanese ペ イ Application ト society system)
Treatment temp: 50～60 ℃
Treatment time: 115 seconds
(7) washing is * 2 times
(8) cleanup acid treatment
Treatment solution: 5% (w/v) Surfcleaner CP4325 (Japanese ペ イ Application ト society system)
0.5% (w/v) Surfcleaner CH7275 (Japanese ペ イ Application ト society system)
Treatment temp: 20～40 ℃
Treatment time: 72 seconds
(9) washing is * 2 times
(10) change into processing
Treatment solution: 0.5% (w/v) Alsurf CX4707 (Japanese ペ イ Application ト society make)
Treatment temp: 30～40 ℃
Treatment time: 61 seconds
(11) washing is * 2 times
(12) aftertreatment
Treatment solution: 0.02% (w/v) Surfcoat CX4661 (Japanese ペ イ Application ト society system)
Treatment temp: 50～60 ℃
Treatment time: 30 seconds
(13) washing is * 2 times
(14) remove moisture
(15) drying
(16) powder coated
Coating A400 (Japanese ペ イ Application ト society system) makes that dry film thickness is 100 μ m, 160 ℃ of calcinings 20 minutes down.
(17) color base (color base) coating
(18) cleaning coating
[comparative example 1]
Use aluminium alloy, make the aluminium wheel shaping, from mould, take out the aluminium wheel, after heat-treating, carry out shot peening, afterwards, do not carry out the operation of (1)～(4) of the foregoing description 1, carry out pretreatment procedure (5)～(15) and painting process (16)～(18) successively, obtain the coating thing of aluminium wheel as the foregoing description 1 coating.
[embodiment 2]
By using aluminium alloy, make the aluminium wheel shaping, from mould, take out the aluminium wheel, after heat-treating, carry out shot peening, afterwards, carry out the operation of following (1)～(16) successively, obtain the coating thing of aluminium wheel.
(1) strong alkaline aqueous solution is handled
Treatment solution: 5% (w/v) sodium hydroxide (pH13.1)
Treatment temp: 40 ℃
Treatment time: 150 seconds
Etch quantity: 2500mg/m
2
(2) washing is * 2 times
(3) acidic aqueous solution is handled
Treatment solution: 5～10% (w/v) nitric acid (pH1.5 is following)
Treatment temp: 30 ℃
Treatment time: 30 seconds
(4) washing is * 2 times
(5) hot water wash
(6) skimming treatment
Treatment solution: 3% (w/v) Off ア イ Application Network リ-Na-FC-359 (パ-カ-society's system)
Treatment temp: 50～60 ℃
Treatment time: 115 seconds
(7) washing is * 2 times
(8) cleanup acid treatment
Treatment solution: 5% (w/v) プ ロ ピ レ Application PL-5552 (パ-カ-society's system)
Treatment temp: 45～50 ℃
Treatment time: 72 seconds
(9) washing is * 2 times
(10) change into processing
Treatment solution: 2% (w/v) パ Le コ-ト CT-4600 (パ-カ-society makes)
Treatment temp: 36～40 ℃
Treatment time: 61 seconds
(11) washing is * 3 times
(12) remove moisture
(13) drying
(14) powder coated
(15) color base coating
(16) cleaning coating
[comparative example 2]
By using aluminium alloy, make the aluminium wheel shaping, from mould, take out the aluminium wheel, after heat-treating, carry out shot peening, afterwards, do not carry out the operation of (1)～(4) of the foregoing description 2, carry out successively obtaining the coating thing of aluminium wheel as (5)～(13) of the pretreatment procedure of the foregoing description 2 coating with as the operation of painting process (14)～(16).
For the coating thing of the aluminium wheel that obtains in the foregoing description 1,2, the comparative example 1,2, carry out anti-filiform corrosion test and CASS test.
So-called anti-filiform corrosion test is to repeat salt spray testing (JIS Z2371) and moistening within a certain period of time alternately, studies at body material, is coated with the test method of intermembranous generation filiform corrosion, and test period is 1680 hours.
So-called CASS test, it is test method according to JISH8502, be in cupric chloride (II) dihydrate being added to the atmosphere that the solution spray that forms in the acetic acid tart sodium chloride solution forms, the test method of the erosion resistance of research coating, test period is 240 hours.
For anti-filiform corrosion test, carry out in 2 places of spoke longitudinal wall, 2 places of wheel rim longitudinal wall at the aluminium wheel, test for CASS, carry out in 2 places of spoke longitudinal wall, 2 places of internal edge, 2 places of marginal surface, 2 places of wheel rim longitudinal wall at aluminium wheel, for the mean value separately of the measurement result of anti-filiform corrosion test, CASS test shown in the table 1.
Table 1
| Anti-filiform corrosion test | The CASS test | |
| Comparative example 1 | 7.7mm | 0.83mm |
| Comparative example 2 | 8.5mm | 1.9mm |
| Anti-filiform corrosion test | The CASS test | |
| Embodiment 1 | 1.4mm | 0.3mm |
| Embodiment 2 | 1.0mm | 1.0mm |
Result by above-mentioned table 1 can judge, with respect to the coating thing of the aluminium wheel that obtains in the comparative example 1,2, is coating thing excellence in CASS test and the test of anti-filiform corrosion of the aluminium wheel that obtains in the embodiments of the invention 1,2.That is, can judge after the aluminium wheel is made, and before the operation of carrying out,, can improve the erosion resistance of aluminium wheel by handling with strong alkaline aqueous solution of the present invention or alkali brine electrolysis as the pre-treatment (non-chromate processing) of the coating of aluminium wheel usually.Even think in addition for aluminium wheel and the adaptation of filming, also be improved.The result of this CASS test and the test of anti-filiform corrosion is the identical or value on it of coating thing of taking turns with the resulting aluminium of pre-treatment of coating by having chromate treating.
This thinks to be obtained by following reason.
Before the pre-treatment of coating, handle by use strong alkaline aqueous solution or alkali brine electrolysis, thereby the aluminium wheel surface is carried out etching, to remain in the iron al dissolution on every side of aluminium wheel surface owing to shot peening, iron is exposed to the aluminium wheel surface and is removed, and then, handle by the acidic aqueous solution etc. that uses the back operation, iron fully can be removed.
Thus, think the iron that to get rid of one of key element as the adaptation that hinders the aluminium wheel surface and film substantially.Thus, can prevent the reactive aluminum of iron of this moisture etc. and above-mentioned shot blast particles etc. and base material and the erosion resistance that produces reduces because the moisture etc. in the atmosphere sees through films.
In addition, by using strong alkaline aqueous solution or alkali brine electrolysis the aluminium wheel surface is carried out etching, thereby expose eutectic structure, form fine male and fomale(M﹠F) on the surface on the surface of aluminium wheel.Film by forming on this male and fomale(M﹠F), making films combines securely with the aluminium wheel surface, improves the erosion resistance of aluminium wheel surface.
In addition, think and to remove the alumina coating that fully to remove, become one of key element of hindering aluminium wheel and the adaptation of filming by degreasing and pickling in the pre-treatment that has the coating that non-chromic acid handles at present attached to the aluminium wheel surface.This is to handle owing to using to have than strong alkaline aqueous solution or the alkali brine electrolysis of the high pH of degreasing in the pre-treatment of common coating, and the etch quantity of taking turns with respect to this aluminium also reaches 1000～20000mg/m
2High like this.
In addition, can also remove one of the more plain wet goods organic impurity that hinders aluminium wheel and the adaptation of filming.
That is, before the pre-treatment of present coating, by carrying out processing of the present invention, compare with present method, improved the degree of cleaning of aluminium wheel surface, the aluminium wheel is improved with the adaptation of filming, and erosion resistance also is improved.
Claims (12)
1, a kind of surface treatment method of aluminium basis material, it is on aluminium basis material, after the pre-treatment of coating with the treatment process of changing into, the surface treatment method of the aluminium basis material that is coated with, it is characterized in that before aluminium basis material is carried out the pre-treatment of above-mentioned coating, handling by strong alkaline aqueous solution or alkali brine electrolysis.
2, the surface treatment method of aluminium basis material as claimed in claim 1, the pre-treatment that it is characterized in that above-mentioned coating comprise degreasing or/and pickling and change into the operation of processing.
3, the surface treatment method of aluminium basis material as claimed in claim 1 or 2 is characterized in that applying ultrasonic wave when handling aluminium basis material by use strong alkaline aqueous solution or alkali brine electrolysis.
4, the surface treatment method of aluminium basis material as claimed in claim 1 or 2 is characterized in that in the processing of being undertaken by above-mentioned strong alkaline aqueous solution or alkali brine electrolysis, is 1000～20000mg/m with respect to the etch quantity of above-mentioned aluminium basis material
2
5, the surface treatment method of aluminium basis material as claimed in claim 1 or 2, the pH that it is characterized in that above-mentioned strong alkaline aqueous solution is more than 12.0.
The surface treatment method of 6 aluminium basis materials as claimed in claim 1 or 2 is characterized in that above-mentioned strong alkaline aqueous solution is aqueous sodium hydroxide solution or potassium hydroxide aqueous solution.
7, the surface treatment method of aluminium basis material as claimed in claim 1 or 2, the pH that it is characterized in that above-mentioned alkali brine electrolysis is 10.5～11.7.
8, the surface treatment method of aluminium basis material as claimed in claim 1 or 2 is characterized in that above-mentioned alkali brine electrolysis is the cathode solution that the electrolysis wet chemical generates.
The surface treatment method of 9 aluminium basis materials as claimed in claim 1 or 2, it is characterized in that using strong alkaline aqueous solution or alkali brine electrolysis to handle aluminium basis material after, carry out pickling, carry out the pre-treatment of above-mentioned coating then.
10, the surface treatment method of aluminium basis material as claimed in claim 9 is characterized in that above-mentioned pickling is that acidic aqueous solution below 2 is handled by pH.
11, the surface treatment method of aluminium basis material as claimed in claim 10 is characterized in that above-mentioned acidic aqueous solution is aqueous nitric acid or aqueous sulfuric acid.
The surface treatment method of 12 aluminium basis materials as claimed in claim 1 or 2 is characterized in that above-mentioned aluminium basis material is the aluminium wheel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005301101 | 2005-10-17 | ||
| JP2005301101A JP2007107069A (en) | 2005-10-17 | 2005-10-17 | Surface treatment method for aluminum-based substrate |
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| CN1970844A true CN1970844A (en) | 2007-05-30 |
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| CN101713073A (en) * | 2008-09-30 | 2010-05-26 | 中央精机株式会社 | Surface treating method for aluminum vehicle wheels and alkali etching liquid |
| CN101775608A (en) * | 2010-03-05 | 2010-07-14 | 邓伟明 | Method and device for cleaning aluminum alloy radiating fin |
| CN102137956B (en) * | 2008-09-03 | 2013-08-28 | 中央精机株式会社 | Process for production of aluminum wheel |
| TWI412625B (en) * | 2007-11-01 | 2013-10-21 | Nihon Parkerizing | Method for making a surface adjusted aluminum casting |
| CN103668169A (en) * | 2013-11-28 | 2014-03-26 | 浙江鸿峰铝业有限公司 | Surface treatment process used before coating of aluminum alloy |
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| JP2002088492A (en) * | 2000-06-30 | 2002-03-27 | Topy Ind Ltd | Method for coating aluminum wheel |
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| CN101775608A (en) * | 2010-03-05 | 2010-07-14 | 邓伟明 | Method and device for cleaning aluminum alloy radiating fin |
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| CN105734598A (en) * | 2016-03-29 | 2016-07-06 | 浙江道明光电科技有限公司 | Environment-friendly chemical surface treatment method of aluminum foil in aluminum plastic film for lithium battery packing |
| CN106350856A (en) * | 2016-09-11 | 2017-01-25 | 经阁铝业科技股份有限公司 | Process for treating anodic electrophoretic surfaces of aluminum section bars |
| CN111850573A (en) * | 2020-07-15 | 2020-10-30 | 北京首钢吉泰安新材料有限公司 | Steel pickling pretreatment method and product thereof |
| CN111850573B (en) * | 2020-07-15 | 2021-11-23 | 北京首钢吉泰安新材料有限公司 | Steel pickling pretreatment method and product thereof |
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