CN108930045A - One Albatra metal cleaning method - Google Patents
One Albatra metal cleaning method Download PDFInfo
- Publication number
- CN108930045A CN108930045A CN201810791575.8A CN201810791575A CN108930045A CN 108930045 A CN108930045 A CN 108930045A CN 201810791575 A CN201810791575 A CN 201810791575A CN 108930045 A CN108930045 A CN 108930045A
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- China
- Prior art keywords
- copper alloy
- cleaning method
- clean
- embathed
- taking out
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Classifications
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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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
-
- 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
- C23F17/00—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
-
- 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
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
Abstract
The invention belongs to copper alloy surface processing technology fields, disclose an Albatra metal cleaning method, comprising the following steps: Step 1: pickling: taking out and clean after copper alloy is embathed in pickling solution；Step 2: light out: taking out and clean after copper alloy obtained in step 1 is embathed in light-emitting solution；Step 3: demoulding: taking out and clean after copper alloy obtained in step 2 is embathed in liquid parting；The complete Chrome-free of copper alloy cleaning method, without phosphorus, heavy metal free and the toxic and harmful substance, its waste water treatment process is simple, wastewater treatment chemicals mainly uses cheap quick lime, caustic soda and a small amount of flocculant, its cost for wastewater treatment is compared with high-concentration chromium-containing wastewater processing cost, very cheap.
Description
Technical field
The invention belongs to copper alloy surface processing technology fields, and in particular to an Albatra metal cleaning method.
Background technique
In copper alloy wire manufacturing field, due to the waste water generated after chrome pickle, passivation and the chromium slag pair filtered out
Natural ecological environment is one very big cause evil source and potential danger source always, and common Chrome-free cleaning technique technique on the market
There is limitation not easy to operate and uncontrollable in the practices such as tank liquor temperature rise is fast, tank liquor is unstable, even needs cooling installation again
Property, while also because cleaning cost is difficult to control, substitute the environmentally friendly Chrome-free cleaning technique work of chrome pickle passivation, low cost
Skill just becomes entire copper alloy wire manufacturing field and wants the technical problem solved by every means.
Summary of the invention
In order to solve the above problems existing in the present technology, it is an object of that present invention to provide an Albatra metal cleaning methods.
The technical scheme adopted by the invention is as follows:
One Albatra metal cleaning method, comprising the following steps:
Step 1: pickling: taking out and clean after copper alloy is embathed in pickling solution；Pickling solution includes that mass percent is
98% industrial sulphuric acid 5-15%, 50% hydrogen peroxide 5-15% and glacial acetic acid 0.1-1%, surplus are water；
The strong oxidizer nitric acid and industrial sulphuric acid that can generate toxic smoke in the prior art are substituted with hydrogen peroxide in the process
Combination removes rapidly the oxide of copper alloy surface, converts cupric sulphate crystal for copper alloy oxide and precipitate.
Step 2: light out: taking out and clean after copper alloy obtained in step 1 is embathed in light-emitting solution；Light-emitting solution packet
The ethyl alcohol 0-7% that mass percent is 50% hydrogen peroxide 4-99.9%, 98% industrial sulphuric acid 0.1-0.6% and 95% is included,
Surplus is water；
After overpickling removing oxide on surface bath cleaning, copper alloy surface does not have copper alloy because of non-uniform corrosion
There is good metallic luster, it is therefore desirable to go out light in step 2, carrying out mild chemical polishing may make copper alloy surface to reach
To bright state；Ethyl alcohol is used as stabilizer in this process, extends the service life of light-emitting solution, is prolonged by original 4 days or so
Length was to 7 days or so.
Step 3: demoulding: taking out and clean after copper alloy obtained in step 2 is embathed in liquid parting；Liquid parting packet
Including mass percent is glacial acetic acid 1-100%, and surplus is water.
For copper alloy after going out light bath cleaning, surface will form one layer of golden yellow copper alloy oxidation film, need
It takes off and removes in glacial acetic acid aqueous solution, the original metallic luster of copper alloy can be shown.
Preferably, the copper alloy cleaning method further include:
Step 4: passivation: taking out and clean after copper alloy obtained in step 3 is passivated processing in passivating solution.
It is to enhance its oxidation resistance during subsequent packing, storage after copper alloy demoulding, after bath cleaning,
It needs to carry out anti-oxidant treatment by passivation.Wherein, passivating solution is the prior art.
Preferably, the copper alloy cleaning method further include:
Step 5: dry: taking out and air-dry after copper alloy obtained in step 4 is embathed in the hot water.
Copper alloy is rapid draing, can soak copper alloy in 60-90 DEG C of hot water after transpassivation anti-oxidant treatment
It washes 5~10 seconds, then rapid evaporation surface moisture, can be packaged after dry.
Preferably, the pickling solution in the step 1 by by mass percentage for 98% industrial sulphuric acid 8-10%, 50%
Hydrogen peroxide 8-10% and glacial acetic acid 0.1-1% add water to 100% and be mixed.
Preferably, the time of embathing in the step 1 is 10-60 seconds, and embathing temperature is room temperature.
Preferably, the light-emitting solution in the step 2 is by being by mass percentage 50% hydrogen peroxide 10-20% and 98%
Industrial sulphuric acid 0.25-0.4% add water to 100% and be mixed.
Preferably, the time of embathing in the step 2 is 10-60 seconds, and embathing temperature is room temperature.
Preferably, the liquid parting in the step 3 is mixed by adding water to 100% by mass percentage for glacial acetic acid 10-20%
Conjunction is made.
Preferably, the time of embathing in the step 3 is 10-60 seconds, and embathing temperature is room temperature.
Above-mentioned cleaning is sufficiently washing.
The invention has the benefit that
Copper alloy cleaning method provided by the present invention, each process section tank liquor are free of lead, mercury, cadmium, Cr VI, polybrominated biphenyls
And more bromobenzene ethers, also the hypertoxic harmful chemical such as not phosphorous and its derivative, tank liquor main component are hydrogen peroxide and a small amount of carbon
Hydrogen compound and trace carbon, hydrogen, oxygen, nitrogen compound, under alkalescent state, it is easy to resolve into oxygen and water and biology drop
Solution, therefore the waste water generated is mainly used to close in quick lime and caustic soda and adjusts pH value to partial neutral, and the inside cupric sulphate crystal is filtered out,
The clear liquid of formation is easy to be purified to discharge standard, has thoroughly prevented chromate waste water and has handled not clean and chromium slag to water in natural environment
The destruction of body and soil and potential hazard, due to the complete Chrome-free of copper alloy cleaning method, without phosphorus, heavy metal free and poisonous and harmful
Chemical substance, waste water treatment process is simple, and wastewater treatment chemicals is mainly using cheap quick lime, caustic soda and a small amount of flocculation
Agent, cost for wastewater treatment are compared with high-concentration chromium-containing wastewater processing cost, very cheap.
Detailed description of the invention
Fig. 1 is the flow chart of copper alloy cleaning method of the present invention.
Fig. 2 is waste water treatment process figure of the invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment does further explaination to the present invention.
Embodiment 1:
As shown in Figure 1, the present embodiment provides an Albatra metal cleaning method, for cleaning copper alloy wire, including it is following
Step:
Step 1: pickling: by copper alloy wire by mass percentage for 98% industrial sulphuric acid 9%, 50% dioxygen
Water 9% and glacial acetic acid 0.6%, which add water in the pickling solution that 100% is mixed after embathing 50 seconds, to be taken out and cleans, and temperature is embathed
For room temperature.
Step 2: light out: by copper alloy wire obtained in step 1 by mass percentage for 50% hydrogen peroxide
15% and 98% industrial sulphuric acid 0.3% adds water in the light-emitting solution that 100% is mixed embathe 50 seconds after take out and clean, soak
Washing temperature is room temperature.
Step 3: demoulding: being by mass percentage glacial acetic acid 10% plus water by copper alloy wire obtained in step 2
It takes out and cleans after embathing 50 seconds in the liquid parting being mixed to 100%, embathing temperature is room temperature.
Step 4: passivation: being taken after copper alloy wire obtained in step 3 is passivated processing 50 seconds in passivating solution
Out and clean.
Step 5: dry: taking out wind after copper alloy wire obtained in step 4 is embathed 8 seconds in 85 DEG C of hot water
It is dry, it can be packaged after dry.
Embodiment 2:
As shown in Figure 1, the present embodiment provides an Albatra metal cleaning methods, comprising the following steps:
Step 1: pickling: by copper alloy by mass percentage for 98% industrial sulphuric acid 5%, 50% hydrogen peroxide 5%
It is added water in the pickling solution that 100% is mixed with glacial acetic acid 0.1% after embathing 60 seconds and takes out and clean, it is normal for embathing temperature
Temperature.
Step 2: light out: by copper alloy obtained in step 1 by mass percentage for 50% hydrogen peroxide 4%,
The ethyl alcohol 7% of 98% industrial sulphuric acid 0.1% and 95% adds water in the light-emitting solution that 100% is mixed embathe 60 seconds after take out
And clean, embathing temperature is room temperature.
Step 3: demoulding: being by mass percentage that glacial acetic acid 1% adds water to by copper alloy obtained in step 2
It takes out and cleans after embathing 60 seconds in 100% liquid parting being mixed, embathing temperature is room temperature.
Step 4: passivation: being taken out simultaneously after copper alloy obtained in step 3 is passivated processing 20 seconds in passivating solution
Cleaning.
Step 5: dry: taking out and air-dry after copper alloy obtained in step 4 is embathed 10 seconds in 90 DEG C of hot water, do
It can be packaged after dry.
Embodiment 3:
As shown in Figure 1, the present embodiment provides an Albatra metal cleaning methods, comprising the following steps:
Step 1: pickling: by copper alloy by mass percentage for 98% industrial sulphuric acid 15%, 50% hydrogen peroxide
15% and glacial acetic acid 1% add water in the pickling solution that 100% is mixed after embathing 20 seconds and take out and clean, it is normal for embathing temperature
Temperature.
Step 2: light out: by copper alloy obtained in step 1 by mass percentage for 50% hydrogen peroxide 99.4%
With embathe 25 seconds in 98% light-emitting solution that is mixed of industrial sulphuric acid 0.6% after take out and clean, embathing temperature is room temperature.
Step 3: demoulding: being by mass percentage to be taken off made of glacial acetic acid 100% by copper alloy obtained in step 2
It takes out and cleans after embathing 20 seconds in film liquid, embathing temperature is room temperature.
Step 4: passivation: being taken out simultaneously after copper alloy obtained in step 3 is passivated processing 30 seconds in passivating solution
Cleaning.
Step 5: dry: taking out and air-dry after copper alloy obtained in step 4 is embathed 6 seconds in 60 DEG C of hot water, do
It can be packaged after dry.
Embodiment 4:
As shown in Figure 1, the present embodiment provides an Albatra metal cleaning method, for cleaning copper alloy wire, including it is following
Step:
Step 1: pickling: by copper alloy wire by mass percentage for 98% industrial sulphuric acid 10%, 50% dioxygen
Water 10% and glacial acetic acid 0.6%, which add water in the pickling solution that 100% is mixed after embathing 35 seconds, to be taken out and cleans, and temperature is embathed
For room temperature.
Step 2: light out: by copper alloy wire obtained in step 1 by mass percentage for 50% hydrogen peroxide
55%, the ethyl alcohol 5% of 98% industrial sulphuric acid 0.3% and 95%, which adds water in the light-emitting solution that 100% is mixed, embathes 35 seconds
After take out and clean, embathing temperature is room temperature.
Step 3: demoulding: being by mass percentage glacial acetic acid 55% plus water by copper alloy wire obtained in step 2
It takes out and cleans after embathing 35 seconds in the liquid parting being mixed to 100%, embathing temperature is room temperature.
Step 4: passivation: being taken after copper alloy wire obtained in step 3 is passivated processing 35 seconds in passivating solution
Out and clean.
Step 5: dry: taking out wind after copper alloy wire obtained in step 4 is embathed 8 seconds in 70 DEG C of hot water
It is dry, it can be packaged after dry.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are each under the inspiration of the present invention
The product of kind form.Above-mentioned specific embodiment should not be understood the limitation of pairs of protection scope of the present invention, protection of the invention
Range should be subject to be defined in claims, and specification can be used for interpreting the claims.
Claims (9)
1. an Albatra metal cleaning method, it is characterised in that the following steps are included:
Step 1: pickling: taking out and clean after copper alloy is embathed in pickling solution；Pickling solution includes that mass percent is 98%
Industrial sulphuric acid 5-15%, 50% hydrogen peroxide 5-15% and glacial acetic acid 0.1-1%, surplus is water；
Step 2: light out: taking out and clean after copper alloy obtained in step 1 is embathed in light-emitting solution；Light-emitting solution includes matter
Amount percentage is the ethyl alcohol 0-7% of 50% hydrogen peroxide 4-99.9%, 98% industrial sulphuric acid 0.1-0.6% and 95%, surplus
For water；
Step 3: demoulding: taking out and clean after copper alloy obtained in step 2 is embathed in liquid parting；Liquid parting includes matter
Amount percentage is glacial acetic acid 1-100%, and surplus is water.
2. copper alloy cleaning method according to claim 1, it is characterised in that: the copper alloy cleaning method further include:
Step 4: passivation: taking out and clean after copper alloy obtained in step 3 is passivated processing in passivating solution.
3. copper alloy cleaning method according to claim 2, it is characterised in that: the copper alloy cleaning method further include:
Step 5: dry: taking out and air-dry after copper alloy obtained in step 4 is embathed in the hot water.
4. copper alloy cleaning method according to claim 1, it is characterised in that: the pickling solution in the step 1 is by pressing matter
Amount percentage adds water to 100% for 98% industrial sulphuric acid 8-10%, 50% hydrogen peroxide 8-10% and glacial acetic acid 0.1-1% and mixes
Conjunction is made.
5. copper alloy cleaning method according to claim 1 or 4, it is characterised in that: embathe the time in the step 1
It is 10-60 seconds, embathing temperature is room temperature.
6. copper alloy cleaning method according to claim 1, it is characterised in that: the light-emitting solution in the step 2 is by pressing matter
The industrial sulphuric acid 0.25-0.4% for the hydrogen peroxide 10-20% and 98% that amount percentage is 50% adds water to 100% and is mixed.
7. copper alloy cleaning method according to claim 1 or 6, it is characterised in that: embathe the time in the step 2
It is 10-60 seconds, embathing temperature is room temperature.
8. copper alloy cleaning method according to claim 1, it is characterised in that: the liquid parting in the step 3 is by pressing matter
Amount percentage adds water to 100% for glacial acetic acid 10-20% and is mixed.
9. copper alloy cleaning method according to claim 1 or 8, it is characterised in that: embathe the time in the step 3
It is 10-60 seconds, embathing temperature is room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810791575.8A CN108930045B (en) | 2018-07-18 | 2018-07-18 | Copper alloy cleaning method |
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| CN201810791575.8A CN108930045B (en) | 2018-07-18 | 2018-07-18 | Copper alloy cleaning method |
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| CN108930045B CN108930045B (en) | 2020-12-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763936A (en) * | 2020-07-07 | 2020-10-13 | 苏州市吴中区曙光铜管厂 | Pre-passivation treatment process for inner wall of seamless smooth copper pipe |
| CN115110085A (en) * | 2021-10-23 | 2022-09-27 | 赵晓峰 | Novel method for improving stripping process in copper and alloy hydrogen peroxide chemical polishing system |
| CN115852383A (en) * | 2022-11-25 | 2023-03-28 | 国网浙江省电力有限公司宁波供电公司 | Copper alloy wire surface treatment equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD104323A5 (en) * | 1973-04-25 | 1974-03-05 | ||
| CN101235507A (en) * | 2007-02-02 | 2008-08-06 | 深圳富泰宏精密工业有限公司 | Technique for cleaning beryllium-copper alloy |
| CN102051620A (en) * | 2010-11-24 | 2011-05-11 | 温州奥洋金属表面处理有限公司 | Polishing solution for replacing copper pickling process to process surface of copper and copper alloy |
| CN103849876A (en) * | 2012-12-03 | 2014-06-11 | 浙江伟星实业发展股份有限公司 | Chemical polishing method |
| CN106676538A (en) * | 2017-01-18 | 2017-05-17 | 宁波金田铜业(集团)股份有限公司 | Environment-friendly technology for copper and copper alloy surface treatment |
-
2018
- 2018-07-18 CN CN201810791575.8A patent/CN108930045B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD104323A5 (en) * | 1973-04-25 | 1974-03-05 | ||
| CN101235507A (en) * | 2007-02-02 | 2008-08-06 | 深圳富泰宏精密工业有限公司 | Technique for cleaning beryllium-copper alloy |
| CN102051620A (en) * | 2010-11-24 | 2011-05-11 | 温州奥洋金属表面处理有限公司 | Polishing solution for replacing copper pickling process to process surface of copper and copper alloy |
| CN103849876A (en) * | 2012-12-03 | 2014-06-11 | 浙江伟星实业发展股份有限公司 | Chemical polishing method |
| CN106676538A (en) * | 2017-01-18 | 2017-05-17 | 宁波金田铜业(集团)股份有限公司 | Environment-friendly technology for copper and copper alloy surface treatment |
Non-Patent Citations (2)
| Title |
|---|
| 井涛等: "弱碱性条件下紫铜化学抛光新工艺", 《腐蚀科学与防护技术》 * |
| 张允诚等: "《电镀手册（第4版）》", 31 December 2011, 国防工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763936A (en) * | 2020-07-07 | 2020-10-13 | 苏州市吴中区曙光铜管厂 | Pre-passivation treatment process for inner wall of seamless smooth copper pipe |
| CN115110085A (en) * | 2021-10-23 | 2022-09-27 | 赵晓峰 | Novel method for improving stripping process in copper and alloy hydrogen peroxide chemical polishing system |
| CN115852383A (en) * | 2022-11-25 | 2023-03-28 | 国网浙江省电力有限公司宁波供电公司 | Copper alloy wire surface treatment equipment |
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| CN108930045B (en) | 2020-12-15 |
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