CN108220947A - A kind of cobalt salt chemical conversion solution recycling method - Google Patents
A kind of cobalt salt chemical conversion solution recycling method Download PDFInfo
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- CN108220947A CN108220947A CN201810004829.7A CN201810004829A CN108220947A CN 108220947 A CN108220947 A CN 108220947A CN 201810004829 A CN201810004829 A CN 201810004829A CN 108220947 A CN108220947 A CN 108220947A
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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
- C23C22/86—Regeneration of coating baths
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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
- C23C22/05—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 using aqueous solutions
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Abstract
The present invention provides a kind of cobalt salt chemical conversion solution recycling method, this method is that cobalt salt chemical conversion stoste is pressed a kind of circulation pattern, after repeatedly cycle carries out test specimen film formation reaction, gained conversion waste liquid adds in a certain amount of film forming accelerating and obtains cobalt salt chemical conversion recycling liquid, and obtained cobalt salt chemical conversion recycling liquid is re-used for the film formation reaction of test specimen.The service life of conversion fluid is extended by this method, and the conversion film of gained has good film-formation result, appearance compactness is also improved.
Description
Technical field
The present invention relates to a kind of recycling methods of cobalt salt chemical conversion solution, belong to returning for metal finishing industry
Receive technical field.
Background technology
Increasingly extensive with aluminium alloy application range, people increasingly improve the requirement of aluminum alloy materials.Aluminium
Alloy surface conversion processing is a kind of technology for generating film layer in aluminum alloy surface using chemistry or electrochemical method, is closed for aluminium
Anti-corrosion, delustring and the decoration of golden part.Through living conversion processing, the Corrosion Protection of aluminium alloy can be improved, can be widely applied to
The industrial circles such as aerospace, building, camera, optical instrument.At present, corrosion resistant performance is excellent, the small aluminium alloy table of pollution effect
Face transformation processing method is cobalt salt chemical conversion, but conversion fluid still contains a large amount of cobalt after single treatment in waste liquid is converted
Salt, if direct emission can cause the serious wasting of resources and environmental pollution.Therefore, the cobalt salt chemical conversion of aluminium and its alloy is studied
Recycling method has certain practical significance.
Invention content
For film layer existing for existing aluminium and aluminum alloy surface conversion treatment process is thin, stability is poor, conversion fluid uses the longevity
The problems such as short, production cost is high, complicated for operation cumbersome is ordered, the present invention is intended to provide a kind of for the cobalt salt of aluminium and aluminium alloy chemistry
Conversion fluid and its application in aluminium and the processing of Al-alloy parts cycling and reutilization.
To achieve these goals, the present invention provides a kind of sharp again for the cobalt salt chemical conversion cycle of aluminium and aluminium alloy
With method, it includes the cobalt salt chemical conversion stostes of configuration aluminium and aluminium alloy, after a kind of circulation pattern repeatedly cycle, add in oxygen
Aluminium is made in agent and the cobalt salt chemical conversion of aluminium alloy recycles liquid, recycles again.
Specific technical solution of the invention is as follows：
The present invention provides a kind of cobalt salt chemical conversion solution recycling method, and this method is by cobalt salt chemical conversion stoste
By a kind of circulation pattern, after repeatedly cycle carries out test specimen film formation reaction, gained conversion waste liquid adds in a certain amount of film forming accelerating
It obtains cobalt salt chemical conversion and recycles liquid, obtained cobalt salt chemical conversion recycling liquid is re-used for the film formation reaction of test specimen.
Preferably circulation pattern of the present invention is：By test specimen be put into conversion stoste in film formation reaction it is primary after, take out examination
Part, remaining conversion fluid add in after conversion stoste to initial volume the film formation reaction for being re-used for test specimen, five periods are recycled with this.
Preferred film forming accelerating is sodium permanganate (NaMnO4), sodium chlorate (NaClO3), sodium bromate (NaBrO3) in appoint
Meaning is a kind of, and the film forming accelerating concentration is preferably 20g/L.
Preferred conversion stoste of the present invention includes cobalt salt, ligand, oxidant and water；Wherein：Per 1L in conversion stoste
Containing 10~40g cobalt salts, 20~40g ligands and 20~40g oxidants, surplus is water.Preferred conversion stoste is to be converted per 1L
Containing 25g cobalt salts, 20g ligands and 22g oxidants in liquid, surplus is water.
It is four acetate hydrate cobalt (C that preferred cobalt salt of the present invention, which is the cobalt salt,2H3CoO2·4H2O), the ligand
Preferably ammonium formate (CH5NO2), the oxidant is preferably potassium chlorate (KClO3)。
In above-mentioned cobalt salt chemical conversion solution, the temperature of the film formation reaction of the cobalt salt chemical conversion cycling and reutilization processing
It it is 30-60 DEG C, the time is 20-40 minutes.The temperature of preferred film formation reaction of the present invention is 55 DEG C, and the time is 30 points
Clock.
Preferred test specimen of the present invention is aluminum or aluminum alloy.
Compared with prior art, there are following advantages using the present invention of above-mentioned technical proposal：The present invention passes through to cobalt salt
Chemical conversion solution is formulated, parameter and the improvement of technique use pattern, extends the service life of conversion fluid, and gained
Conversion film has good film-formation result, and appearance compactness is also improved.
Description of the drawings
Fig. 1：AC impedance spectroscopy for cobalt salt chemical composition coating obtained after repeatedly recycling.
Fig. 2：Surface topography map for cobalt salt chemical composition coating obtained after repeatedly recycling.
Fig. 3：To add the conversion film Tafel curve after film forming accelerating recycling.
Fig. 4：To add the surface topography map after film forming accelerating recycling.
Specific embodiment
The technical method of the present invention is made below in conjunction with the drawings and specific embodiments further elucidated above.Except as otherwise saying
Bright outer, instrument, material and reagent used in the following example can be obtained by routine business means.
Embodiment 1：Multiple circular treatment experiment, cobalt salt chemical conversion stoste are carried out to aluminum alloy surface using circulation pattern
Component such as following table：
| Chinese | Component | Dosage |
| Four acetate hydrate cobalts | C2H3CoO2·4H2O | 18g |
| Ammonium formate | CH5NO2 | 20g |
| Potassium chlorate | KClO3 | 20g |
| Water | H2O | To 1L |
By following technological process, the conversion film after repeatedly recycling is compared and analyzed：
(1) it pre-processes：Pickling and alkali cleaning are carried out to aluminum alloy surface, remove established oxidation film and spot.
(2) preparation of conversion fluid：According to the various solid components of dosage precise in upper table, weighing is placed in beaker
And 1L is added water to, stirring and dissolving, which is placed in water-bath, is heated to 50 DEG C.
(3) cycle film forming：Test specimen is put into after film formation reaction is primary in conversion stoste, takes out test specimen, remaining conversion fluid adds
Enter to convert to be re-used for after stoste to initial volume the film formation reaction of test specimen, five periods are recycled with this, specific cycle is as follows：
It recycles for the first time：Film formation reaction is carried out by being placed in the conversion stoste of 500ml by the aluminum alloy sheet of pretreatment, into
Film temperature is 50 DEG C, and film formation time 30min takes out aluminum alloy sheet, rinsed in tap water, then uses deionization after reaction
Water rinses, last electricity consumption blowing drying；Residue conversion solution for standby；
Second of cycle：The remaining conversion solution of first time cycle is added in into conversion stoste to initial volume 500ml, is put into
The aluminum alloy sheet of pretreatment carries out film formation reaction, and film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminium after reaction
Alloy sheet rinses in tap water, then is rinsed with deionized water, last electricity consumption blowing drying；Residue conversion solution for standby；
Third time recycles：The remaining conversion solution of second of cycle is added in into conversion stoste to initial volume 500ml, is put into
The aluminum alloy sheet of pretreatment carries out film formation reaction, and film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminium after reaction
Alloy sheet rinses in tap water, then is rinsed with deionized water, last electricity consumption blowing drying；Residue conversion solution for standby；
4th cycle：The remaining conversion solution of third time cycle is added in into conversion stoste to initial volume 500ml, is put into
The aluminum alloy sheet of pretreatment carries out film formation reaction, and film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminium after reaction
Alloy sheet rinses in tap water, then is rinsed with deionized water, last electricity consumption blowing drying；Residue conversion solution for standby；
5th cycle：The remaining conversion solution of 4th cycle is added in into conversion stoste to initial volume 500ml, is put into
The aluminum alloy sheet of pretreatment carries out film formation reaction, and film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminium after reaction
Alloy sheet rinses in tap water, then is rinsed with deionized water, last electricity consumption blowing drying；Residue conversion solution, also referred to as converts
Waste liquid, it is spare；
(4) it detects：The chemical property of the Conversion Coatings on Aluminum Alloys of generation is measured, measures AC impedance spectroscopy and corresponding plan
It closes data and is shown in Fig. 1 and table 1, and measure the surface topography of film layer, the results are shown in Figure 2.
Table 1
By Fig. 1 and table 1 it is found that with the increase of cycle-index, the capacitive reactance arc dia for recycling for first to period 5 is whole
Upper on a declining curve, the variation of solution resistance Rs is little, and the film layer resistance for recycling first three period is down to from 59.16k Ω
9.36k Ω, after recycle film layer resistance twice and risen, illustrate to be gradually reduced in cycle film layer corrosion resistance early period, wherein before
The corrosion resistance of four times is preferable.Comparison diagram 2 is it is found that the porous structure of film layer is very complete after preceding cycle three times, but aperture exists
It gradually increases, the film layer porous structure of the four to five time disappears, its corresponding film layer corrosion resistance is also declined.
Embodiment 2：Cobalt salt chemical conversion recycles liquid experiment
A certain amount of film forming accelerating is added in into the conversion waste liquid that embodiment 1 obtains and obtains cobalt salt chemical conversion recycling
Obtained cobalt salt chemical conversion recycling liquid is re-used for the film formation reaction of test specimen by liquid.
By following technological process, the recycling of aluminum alloy cobalt salt chemical conversion circulation fluid is compared and analyzed：
(1) it pre-processes：
Pickling and alkali cleaning are carried out to aluminum alloy surface, remove established oxidation film and spot.
(2) preparation of liquid is recycled：The film forming accelerating of 20g/L is added in the conversion waste liquid obtained in embodiment 1
NaBrO3, stirring and dissolving, which is placed in water-bath, is heated to 50 DEG C.
(3) cycle film forming：30min is reacted by being placed in the recycling liquid of 100ml by the aluminium alloy of pretreatment, reaction temperature
Degree maintains 50 DEG C, takes out aluminum alloy sheet after reaction, washes, dry, cycle film forming 10 times, specific as follows：
It recycles for the first time：Film formation reaction is carried out by being placed in the recycling liquid of 100ml by the aluminum alloy sheet of pretreatment, into
Film temperature is 50 DEG C, and film formation time 30min takes out aluminum alloy sheet, rinsed in tap water, then uses deionization after reaction
Water rinses, last electricity consumption blowing drying, residue conversion solution for standby；
Second of cycle：It will be placed in the remaining conversion solution of first time and form a film instead by the aluminum alloy sheet of pretreatment
Should, film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminum alloy sheet, rinsed in tap water, then uses after reaction
Deionized water is rinsed, last electricity consumption blowing drying, residue conversion solution for standby；
Third time recycles：It will be placed in secondary remaining conversion solution and form a film instead by the aluminum alloy sheet of pretreatment
Should, film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminum alloy sheet, rinsed in tap water, then uses after reaction
Deionized water is rinsed, last electricity consumption blowing drying, residue conversion solution for standby；
4th cycle：It will be placed in the remaining conversion solution of third time and form a film instead by the aluminum alloy sheet of pretreatment
Should, film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminum alloy sheet, rinsed in tap water, then uses after reaction
Deionized water is rinsed, last electricity consumption blowing drying, residue conversion solution for standby；
5th cycle：It will be placed in the remaining conversion solution of the 4th time and form a film instead by the aluminum alloy sheet of pretreatment
Should, film-forming temperature is 50 DEG C, and film formation time 30min takes out aluminum alloy sheet, rinsed in tap water, then uses after reaction
Deionized water is rinsed, last electricity consumption blowing drying, residue conversion solution for standby；
(4) it detects：The chemical property of the conversion film of generation is measured, tafel curves is measured and shows with corresponding fitting parameter
In Fig. 3 and table 2, and the surface topography of film layer is measured, the results are shown in Figure 4.
The corrosion-resistant parameter of 2 Tafel curve of table
In Tafel curve, cathodic polarization curve abscissa numerical value corresponding with the intersection point of anodic polarization curves is certainly
Corrosion current, corrosion current is smaller, shows that the corrosion resistance of oxidation film is better.From the figure 3, it may be seen that in cycle initial stage conversion film
Cathode and anode current density IcorrSmaller, initial value is 0.1 μ Acm-2, with the increase of cycle-index, IcorrIncrease, the 4th
I after to the 5th cyclecorrUp to 0.98 μ Acm-2, the corrosion resistance of film layer declines, and illustrates NaBrO3Addition can improve conversion fluid
Service life.With reference to Fig. 4 it is found that addition NaBrO3The surface topography of conversion film obtained by the Posterior circle period 1, it is and rear
Phase is compared, and porous structure does not occur, but closed film layer, and can clearly see a large amount of white crystal and be attached to table
Face.Second to the 4th time cycle surface is sparse porous membrane layer, and with the increase of cycle-index, film surface is showed more
Hole aperture is constantly reducing.
Claims (9)
1. a kind of cobalt salt chemical conversion solution recycling method, which is characterized in that this method is by cobalt salt chemical conversion stoste
By a kind of circulation pattern, after repeatedly cycle carries out test specimen film formation reaction, gained conversion waste liquid adds in a certain amount of film forming accelerating
It obtains cobalt salt chemical conversion and recycles liquid, obtained cobalt salt chemical conversion recycling liquid is re-used for the film formation reaction of test specimen.
2. cobalt salt chemical conversion solution recycling method according to claim 1, which is characterized in that the circulation pattern
For：Test specimen is put into after film formation reaction is primary in conversion stoste, takes out test specimen, remaining conversion fluid adds in conversion stoste to first initial body
The film formation reaction of test specimen is re-used for after product, five periods are recycled with this.
3. cobalt salt chemical conversion solution recycling method according to claim 1, which is characterized in that the film forming promotes
Agent is any one in sodium permanganate, sodium chlorate, sodium bromate.
4. cobalt salt chemical conversion solution recycling method according to claim 1, which is characterized in that the film forming promotes
Agent concentration is 20g/L.
5. cobalt salt chemical conversion solution recycling method according to claim 1, which is characterized in that the conversion stoste
Include cobalt salt, ligand, oxidant and water；Wherein：Contain 10~40g cobalt salts, 20~40g ligands and 20 in conversion stoste per 1L
~40g oxidants, surplus are water.
6. cobalt salt chemical conversion solution recycling method according to claim 5, which is characterized in that the conversion stoste
To contain 25g cobalt salts, 20g ligands and 22g oxidants in every 1L conversion fluids, surplus is water.
7. cobalt salt chemical conversion solution recycling method according to claim 5, which is characterized in that the cobalt salt is four
Acetate hydrate cobalt, the ligand are ammonium formate, and the oxidant is potassium chlorate.
8. according to claim 1-3 any one of them cobalt salt chemical conversion solution recycling methods, which is characterized in that described
The temperature of film formation reaction is 55 DEG C, and the time is 30 minutes.
9. according to claim 1-3 any one of them cobalt salt chemical conversion solution recycling methods, which is characterized in that described
Test specimen be aluminum or aluminum alloy.
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| CN201810004829.7A CN108220947A (en) | 2018-01-03 | 2018-01-03 | A kind of cobalt salt chemical conversion solution recycling method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377426A (en) * | 1999-11-02 | 2002-10-30 | 波音公司 | Non-chromated oxide coating for aluminum substrates |
| CN101693995A (en) * | 2009-09-08 | 2010-04-14 | 上海波平航空科技有限公司 | Preparation method of aluminum alloy corrosion resistant coating |
| CN103266315A (en) * | 2013-05-31 | 2013-08-28 | 海安县申菱电器制造有限公司 | Preparation method of aluminum alloy cobalt salt chemical conversion coating treating fluid |
| CN106868495A (en) * | 2017-01-23 | 2017-06-20 | 江苏理工学院 | A kind of recycling method of cobalt salt chemical oxidation waste liquid |
-
2018
- 2018-01-03 CN CN201810004829.7A patent/CN108220947A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377426A (en) * | 1999-11-02 | 2002-10-30 | 波音公司 | Non-chromated oxide coating for aluminum substrates |
| CN101693995A (en) * | 2009-09-08 | 2010-04-14 | 上海波平航空科技有限公司 | Preparation method of aluminum alloy corrosion resistant coating |
| CN103266315A (en) * | 2013-05-31 | 2013-08-28 | 海安县申菱电器制造有限公司 | Preparation method of aluminum alloy cobalt salt chemical conversion coating treating fluid |
| CN106868495A (en) * | 2017-01-23 | 2017-06-20 | 江苏理工学院 | A kind of recycling method of cobalt salt chemical oxidation waste liquid |
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