CN109267067A - A kind of environmental-protecting chemical polishing fluid polished for aluminium and aluminium alloy high gloss - Google Patents
A kind of environmental-protecting chemical polishing fluid polished for aluminium and aluminium alloy high gloss Download PDFInfo
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- CN109267067A CN109267067A CN201811395993.1A CN201811395993A CN109267067A CN 109267067 A CN109267067 A CN 109267067A CN 201811395993 A CN201811395993 A CN 201811395993A CN 109267067 A CN109267067 A CN 109267067A
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/02—Light metals
- C23F3/03—Light metals with acidic solutions
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Abstract
The invention discloses a kind of environmental-protecting chemical polishing fluids polished for aluminium and aluminium alloy high gloss, belong to Surface Processing Industry technical field.It includes basal liquid and additive, and the basal liquid is 85% concentrated phosphoric acid: 80%-90%(mass fraction), 98% concentrated sulfuric acid: 10%-20%(mass fraction)；The additive is sulfolane, and the additive is added according to 25-100mL/L.The invention is intended to develop it is a kind of can be used for transfer matic, without using nitric acid, do not generate nitrogen oxides, ingredient are simple, maintenance is easy, affordable, high glaze requirement part polishing after do not occur the environment-friendly type aluminium and aluminum alloy chemically polishing fluid of air flue corrosion and current mark.
Description
Technical field
The present invention relates to a kind of environmental-protecting chemical polishing fluids polished for aluminium and aluminium alloy high gloss, belong at surface
Manage industry technology field.
Background technique
Aluminium and aluminium alloy have many advantages, such as light-weight, easy processing, are important one of metal material, are widely used in instrument
The all trades and professions such as instrument, machinery, traffic, haberdashery and hardware.Corrosion resistance to make up aluminium alloy is poor, wearability is low, dicoration is bad
The disadvantages of, it is necessary to it is surface-treated.The polishing of aluminium and aluminium alloy is a vital step in its surface treatment process.
Such as aluminum alloy material phone housing, the anode oxidation coloration of computer casing, chemical polishing is exactly its indispensable pre-treatment work
Skill.There are many common aluminium and aluminium alloy polishing process, and wherein surface with chemical polishing technology belongs to one such:
Chemical polishing refers in a suitable solution, does not use external power supply, and the throwing carried out to part is acted on by chemical etching
Light.Chemical polishing because required equipment is simple, it is economical due to be widely used in the polishing of aluminium and aluminium alloy.It is using more at present
In addition the three acid polishing liquid prepared by a certain percentage by the concentrated sulfuric acid, concentrated phosphoric acid, concentrated nitric acid is occurred in recent years by the concentrated sulfuric acid-
Two sour polishing fluids of concentrated phosphoric acid and additive composition.There are the following problems for discovery in actual use:
(1) environment is polluted
There are nitric acid in three acid polishing liquid, while polishing needs and carrying out at higher temperature (generally 85 DEG C or more), generally can be into
The following chemical reaction of row:
7Al+7H3PO4+5HNO3→7AlPO4+2N2↑+NO2↑+13H2O
5Al+22HNO3→3N2O3+NO↑+11H2O+5Al(NO3)3
2Al+3H2SO4→Al2(SO4)3+6H2↑
A large amount of nitrogen oxide NOx can be generated in polishing process, while escaping a large amount of nitric acid vapors, these gas toxicity are very big,
Intense stimulus respiratory mucosa causes cough, has a headache, is uncomfortable in chest.There are also carcinogenesises by NO, influence cell division.NO2 can be reached
The deep of lung causes serious respiratory disease.Nitrogen oxides is also easy to form photochemical fog, and causes the one of acid rain
Big reason.In addition contain a large amount of NO3- in the waste water generated, be easy to cause total nitrogen exceeded.And NO3- is difficult to handle with chemical method,
Can only microbe processing, this adds increased wastewater treatment difficulty and processing costs.
(2) expensive, difficult in maintenance
The current sour polishing fluid of chemical polishing additive and commodity two is expensive, and dosage is big, and this adds increased production costs.Together
When complicated component, add difficult in maintenance, manufacturer again holds it in close confidence, and the manufacturers such as can only stop production that go wrong in production process send
Technical staff is sent to solve, long period seriously delays production.
(3) part is easy to produce air flue corrosion
The sour polishing fluid of the above three acid polishing liquid, commodity two is found in actual use, for the aluminium and aluminium of hole, groove
Alloy part, when requiring high gloss, polishing time is long, can generate air flue corrosion in the top of hole, groove after a polish:
I.e. hole, the bulk gas generated in groove escape from the upper side during the polishing process, wash away one of dent out, dent above
The brightness at place is also different from other places.This has seriously affected the dicoration of converted products, and wanting for client is also not achieved in appearance
It asks.The applicant tests the chemical polishing solution of multiple commercial vendors, more or less there is this phenomenon, and it is difficult that this is undoubtedly a big industry
Topic.
(4) part is easy to produce current mark
Part, due to the polishing fluid of surface adhesion, chemically reacts still in the polishing for carrying out, while sticking after proposing in polishing trough
Liquid aggregation flows down, and piece surface forms an alternate striped of rule light and shade after washing.In aluminium alloy anode oxide coloring process,
This is to cause the underproof common factors of product appearance.
(5) it is dfficult to apply to transfer matic
One alumilite process gantry transfer matic of Yinmu Home Appliances Mfg. Co Ltd, Shanghai is using three acid polishing liquid, commodity
During two sour polishing fluids, often occur hanger lower end part glossiness higher than upper end, single part lower end glossiness also above
Upper end, analysis the reason for this is that: driving the speed of service have certain limitations, hanger lower end is submerged initially in polishing fluid when entering slot, hangs when slot out
Has lower end last proposition polishing fluid again.And polishing fluid goes out ray velocity too fastly, polishing time is shorter (general 60 seconds or so).This
Outside, by hanger, chemically polishing trough is transferred to rinsing bowl and needs the 10-15s time, polishing fluid can gather part lower end continue it is anti-
It answers.
Summary of the invention
Technical problem to be solved by the present invention lies in: provide a kind of ring polished for aluminium and aluminium alloy high gloss
Guarantor's type chemical polishing solution, it is solved existing for the sour polishing fluid of the three acid polishing liquid generally used currently on the market, commodity two not
Foot, cause to be applied to aluminium and aluminum alloy chemically polishing fluid there is generated using nitric acid nitrogen oxides cause environmental pollution, at
Divide complicated, difficult in maintenance, expensive, part to be easy to produce air flue burn into part to be easy to produce current mark and be dfficult to apply to certainly
The problem of moving-wire.
The technical problems to be solved by the invention take following technical scheme to realize:
A kind of environmental-protecting chemical polishing fluid polished for aluminium and aluminium alloy high gloss, including basal liquid and additive,
The basal liquid is 85% concentrated phosphoric acid: 80%-90%(mass fraction), 98% concentrated sulfuric acid: 10%-20%(mass fraction)；
The additive is sulfolane, and the additive is added according to 25-100mL/L.
A kind of environmental-protecting chemical polishing fluid polished for aluminium and aluminium alloy high gloss the preparation method is as follows:
1, in equipped with air stirring, steam-heated acidproof heat-proof chemical polishing bath, 85% concentrated phosphoric acid of calculation amount is added, it is empty
98% concentrated sulfuric acid is slowly added under gas agitating, the mass ratio of the two mixing is 4:1 to 9:1, obtains basal liquid, different model aluminium
Optimal proportion can be determined by testing.
2, according to basal liquid volume, sulfolane 25-100mL/L is added, stirs evenly, chemical polishing solution, which is prepared, to be completed, ring
Fourth sulfone fusing point is 28 DEG C, can solidify when temperature is lower, the plastic barrel of splendid attire can be put into appropriate heating and melting, ring in hot water storgae
The addition of fourth sulfone can improve the viscosity of polishing fluid basal liquid, improve residence time and uniformity of the bubble in polishing fluid, from
And hole, groove generate air flue corrosion when preventing aluminum alloy part high gloss from polishing, and when design of part is simple, hole, groove
It can choose less additional amount when few；More addition is needed when the complicated hole of design of part, groove are more
Amount, can specifically test adjustment.
It is a kind of to propose method used below for aluminium and the environmental-protecting chemical polishing fluid of aluminium alloy high gloss polishing:
Step (A), by hanger on part, hanger is placed in the pole bar of gantry transfer matic；
Step (B), pre-treatment:
(1) electrochemical deoiling is carried out to parts to be processed,
(2) etch is carried out with the soda-wash solution containing sodium hydroxide,
(3) surface dust is washed away with containing the solution for neutralizing deashing agent；
Step (C), chemical polishing: being heated to 85-95 DEG C for chemical polishing solution, the part after being put into pre-treatment, reacts 90-
180s takes out washing；
Step (D) carries out drying or anodized according to subsequent process flow in actual production；
The maintenance of step (E), polishing fluid:
1, phosphoric acid in polishing fluid, sulfuric acid ratio are analyzed in use process daily, when deviation adjusts in time, and adds ring fourth in proportion
Sulfone；
2, the concentrated sulfuric acid, the concentrated sulfuric acid, sulfolane is added in ratio when can be according to fluting when liquid level is lower, supplies liquid level；
3, aluminium composition in every two days measurement stock removal polishing liquid, should be replaced when aluminium composition is more than 35g/L, can also
A part of old liquid is exhausted, new liquid is prepared and supplies liquid level.
The beneficial effects of the present invention are:
1, environment friendly and pollution-free；Nitric acid is not contained in the present invention, nitrogenfree oxide generates in use process, and nothing is difficult to handle in waste water
Nitrate anion, the phosphate radical that contains be added lime adjust pH value can be removed to 7 or so it is up to standard；The sulfolane contained is not waved
Hair, thermal stability is good, does not decompose in polishing fluid, acts on microorganism nonhazardous；In rinsing bowl sulfolan concentration pole
It is low, during actual use to have no that COD value is significantly raised in waste discharge；It can also be collected separately after chemical polishing if necessary clearly
Wash water carries out Fenton oxidation or biological treatment, can further decrease COD value.
2, corrode after the polishing of aluminium alloy high gloss without air flue, no current mark；Nowadays client is to aluminum alloy mobile phone shell, notes
The decorative appearance of this shell requires high, to add in present invention sulfolane, can improve the viscosity of polishing fluid, improves bubble
Residence time and uniformity in polishing fluid, so that part is enabled aluminum alloy to while obtaining high gloss, hole, groove
No air flue corrosion, while part, after proposing in polishing trough, foam uniform fold, no current mark generates.
3, ingredient simple and stable, maintenance are easy；Polishing fluid of the invention is only made of phosphoric acid, sulfuric acid, sulfolane, ingredient letter
It is single；Phosphoric acid, sulfuric acid can be measured by double indicator titration, be added according to measurement result；Sulfolane is non-volatile, thermal stability pole
It is good, even if being heated to 220 DEG C keeps the temperature 5 hours, is also decomposed on only 2% hair, essentially take loss out of, it only need to be according to phosphoric acid, sulfuric acid
Additional amount is added in fluting ratio.
4, it can be used for transfer matic production；Polishing fluid of the invention can require adjustment polishing time according to transfer matic, improve sulphur
Acid mass fraction increases temperature, can shorten polishing time, otherwise can extend polishing time, can get bright uniform throwing
Light effect；Alumina gantry transfer matic of Yinmu Home Appliances Mfg. Co Ltd, Shanghai polishes certain using the polishing fluid where applicant
After 6063 material notebook computer shells, tested with the vancometer that incidence angle is 60o, hanger upper and lower side part, part upper and lower side light
Damp degree difference < 10%, fully meets customer requirement.
Specific embodiment
In order to be easy to understand to technical means, creative features, achievable purpose and effectiveness of the invention, below with reference to tool
Body embodiment, the present invention is further explained.
Embodiment one: an aluminium alloy anode oxide transfer matic of Yinmu Home Appliances Mfg. Co Ltd, Shanghai is mainly engaged in
The anode oxidation coloration of certain 6063 material aluminium alloy notebook computer shell, there are more heat release hole, screw hole, clients for notebook computer shell
It is required that it is 60o that glossiness, which is 120 ± 10%(incidence angle, after chemical polishing), there is not allowed that the visible current mark of naked eyes, heat release hole, screw
Hole intercepts notebook computer shell and is tested as test piece, obtain the work of chemical polishing solution there is not allowed that the visible air flue corrosion of naked eyes
Skill specification are as follows:
1, basal liquid: 85% concentrated phosphoric acid: 80%(mass fraction), 98% concentrated sulfuric acid: 20%(mass fraction),
2, additive: sulfolane 75mL/L；
3, temperature: 95 DEG C；
4, the time: 150s；
Embodiment two: an aluminium alloy anode oxide transfer matic of Yinmu Home Appliances Mfg. Co Ltd, Shanghai is mainly engaged in certain
The anode oxidation coloration of 6063 material aluminium alloy notebook computer shells, there are more heat release hole, screw hole, Ke Huyao for notebook computer shell
Asking after chemical polishing that glossiness is 120 ± 10%(incidence angle is 60o), there is not allowed that the visible current mark of naked eyes, heat release hole, screw hole
There is not allowed that the visible air flue corrosion of naked eyes, interception notebook computer shell are tested as test piece, the technique for obtaining chemical polishing solution
Specification are as follows:
1, basal liquid: 85% concentrated phosphoric acid: 90% (mass fraction), 98% concentrated sulfuric acid: 10%(mass fraction),
2, additive: sulfolane 100mL/L；
3, temperature: 90 DEG C；
4, the time: 180s；
Embodiment three: an aluminium alloy anode oxide transfer matic of Yinmu Home Appliances Mfg. Co Ltd, Shanghai is mainly engaged in certain
The anode oxidation coloration of 6063 material aluminium alloy notebook computer shells, there are more heat release hole, screw hole, Ke Huyao for notebook computer shell
Asking after chemical polishing that glossiness is 120 ± 10%(incidence angle is 60o), there is not allowed that the visible current mark of naked eyes, heat release hole, screw hole
There is not allowed that the visible air flue corrosion of naked eyes, interception notebook computer shell are tested as test piece, the technique for obtaining chemical polishing solution
Specification are as follows:
1, basal liquid: 85% concentrated phosphoric acid: 85% (mass fraction), 98% concentrated sulfuric acid: 15%(mass fraction),
2, additive: sulfolane 60mL/L；
3, temperature: 87 DEG C；
4, the time: 100s；
The producing line has acidproof heat-proof stainless steel chemical polishing slot, and bottom is equipped with steam-heating pipe and air stirring, need to prepare chemistry
Polishing fluid 3000L, preparation method are as follows:
1,85% concentrated phosphoric acid 3840kg is added in polishing trough；
2, air stirring is opened, 98% concentrated sulfuric acid 960kg is slowly added to, basal liquid, which is prepared, to be completed；
3, sulfolane 210L is added, stirs evenly, polishing fluid, which is prepared, to be completed.
Surface with chemical polishing technology process are as follows:
1, upper extension: notebook computer shell is fixed on hanger, hanger is hung on pole bar；
2, oil removing: sulfuric acid 200-250g/L, 50-60 DEG C of temperature, time 3-5min；Remove the greasy dirt sticked；
3, twice adverse current is washed；
4, alkali cleaning: sodium hydroxide 40-80g/L, 50-60 DEG C of temperature, time 15-30s；Wash away oxide skin, the machined layer on surface；
5, twice adverse current is washed；
6, it neutralizes: ferric trichloride 20-50g/L, hydrochloric acid 100-150g/L, temperature room temperature, time 30-60s；Wash away the dust on surface
7, twice adverse current is washed；
8, chemical polishing: air stirring and the steam heating of chemical polishing bath are opened, and controls temperature using automatic temp controller
It is 95 ± 1 DEG C, control driving is put into the notebook computer shell after cleaning, takes out after reacting 150s；
9, three adverse currents are washed；
10, anodic oxidation, coloring, sealing of hole are carried out by original technique.
Notebook computer shell after randomly selecting three pieces different batches chemical polishing washing, cold wind drying, uses glossiness respectively
Instrument (incidence angle 60o) measures the glossiness in the every appearance upper left corner, the upper right corner, center, the lower left corner, the lower right corner, measurement result
It is as follows:
Glossiness fully meets the 120 ± 10% of customer requirement, while being visible by naked eyes air flue burn into current mark after polishing；It is normal raw
Chemical polishing yields substantially remains in 95% or so when production.
The maintenance of polishing fluid:
1, phosphoric acid in polishing fluid, sulfuric acid ratio are analyzed in use process daily, is adjusted in time when deviateing 4:1, and presses polishing fluid ratio
Example is added: often 22.5kg phosphoric acid being added to add sulfolane 1L；Often plus 24.5kg sulfuric acid adds sulfolane 1L；
2, the concentrated sulfuric acid, the concentrated sulfuric acid, sulfolane is added in ratio when can be according to fluting when liquid level is lower, supplies liquid level；
3, aluminium composition in every two days measurement stock removal polishing liquid, a part of old liquid is exhausted when aluminium composition is more than 35g/L,
It prepares new liquid and supplies liquid level.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, without departing from the spirit and scope of the present invention, this hair
Bright to will also have various changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The present invention claims
Protection scope is defined by the appending claims and its equivalent thereof.
Claims (2)
1. a kind of environmental-protecting chemical polishing fluid polished for aluminium and aluminium alloy high gloss, including basal liquid and additive,
It is characterized in that:
The basal liquid is 85% concentrated phosphoric acid: 80%-90%(mass fraction), 98% concentrated sulfuric acid: 10%-20%(mass fraction)；
The additive is sulfolane, and the additive is added according to 25-100mL/L.
2. a kind of environmental-protecting chemical polishing fluid polished for aluminium and aluminium alloy high gloss according to claim 1 makes
With method:
Step (A), by hanger on part, hanger is placed in the pole bar of gantry transfer matic；
Step (B), pre-treatment:
(1) electrochemical deoiling is carried out to parts to be processed,
(2) etch is carried out with the soda-wash solution containing sodium hydroxide,
(3) surface dust is washed away with containing the solution for neutralizing deashing agent；
Step (C), chemical polishing: being heated to 85-95 DEG C for chemical polishing solution, the part after being put into pre-treatment, reacts 90-
180s takes out washing；
Step (D) carries out drying or anodized according to subsequent process flow in actual production；
The maintenance of step (E), polishing fluid:
1, phosphoric acid in polishing fluid, sulfuric acid ratio are analyzed in use process daily, when deviation adjusts in time, and adds ring fourth in proportion
Sulfone；
2, the concentrated sulfuric acid, the concentrated sulfuric acid, sulfolane is added in ratio when can be according to fluting when liquid level is lower, supplies liquid level；
3, aluminium composition in every two days measurement stock removal polishing liquid, should be replaced when aluminium composition is more than 35g/L, can also
A part of old liquid is exhausted, new liquid is prepared and supplies liquid level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811395993.1A CN109267067B (en) | 2018-11-22 | 2018-11-22 | Environment-friendly chemical polishing solution for high-glossiness polishing of aluminum and aluminum alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811395993.1A CN109267067B (en) | 2018-11-22 | 2018-11-22 | Environment-friendly chemical polishing solution for high-glossiness polishing of aluminum and aluminum alloy |
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| CN109267067A true CN109267067A (en) | 2019-01-25 |
| CN109267067B CN109267067B (en) | 2021-03-30 |
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Cited By (2)
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| CN115386882A (en) * | 2022-08-30 | 2022-11-25 | 立铠精密科技(盐城)有限公司 | Method for improving uniformity between chemical polishing layers, application thereof, system for realizing method and control method |
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| CN115386882A (en) * | 2022-08-30 | 2022-11-25 | 立铠精密科技(盐城)有限公司 | Method for improving uniformity between chemical polishing layers, application thereof, system for realizing method and control method |
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| Publication number | Publication date |
|---|---|
| CN109267067B (en) | 2021-03-30 |
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