CN102234833B - Stripping solution and method for electrolytically removing chromium carbide film - Google Patents
Stripping solution and method for electrolytically removing chromium carbide film Download PDFInfo
- Publication number
- CN102234833B CN102234833B CN201010151258.3A CN201010151258A CN102234833B CN 102234833 B CN102234833 B CN 102234833B CN 201010151258 A CN201010151258 A CN 201010151258A CN 102234833 B CN102234833 B CN 102234833B
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- CN
- China
- Prior art keywords
- chromium carbide
- decoating liquid
- rete
- carbide rete
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
Abstract
A stripping solution for a chromium carbide film provided by the invention is an aqueous solution containing alkali, promoter and additive, wherein, the alkali is a soluble alkali metal hydroxide and has the concentration of 20-200g/L, the promoter is a complexing agent with complexation with chromium ion and has the concentration of 20-150g/L, and the additive is one kind or the combination of sodium tripolyphosphate and pentaphosphate and has the concentration of 0.5-10g/L. The invention further provides a method using the stripping solution to electrolytically remove the chromium carbide film.
Description
Technical field
The present invention relates to a kind of decoating liquid of electrolytic removal substrate surface chromium carbide rete and utilize the method for this decoating liquid electrolytic removal chromium carbide rete.
Background technology
Coating process has a wide range of applications at industrial circle.Yet usually needing plated film is stripped in following two kinds of situations: through behind the life-time service, the plated film of workpiece surface has been damaged or serious aging (1), thereby needs to remove coating, again plating; (2) aborning, the coating of institute's plating does not meet quality requirements, for reducing the loss, saves cost, need to return coating, allows the workpiece again plated film of doing over again.Therefore, how in the situation of not damaging base material, it is a major issue the industrial production that coating is removed fully from substrate surface.
Chromium carbide (Cr
3C
2) film is that a kind of chromium of excellent property is coating, itself and chromium are chromium nitride (Cr the most frequently used in the coating
2N) film is compared and is had stronger anti-oxidant, erosion resistance, and hardness is higher, and wear resisting property is also better, has broad prospects at industrial circle.Existing method to chromium carbide film electrolytic deplating process is to adopt the decoating liquid that only contains single alkali metal hydroxide (such as sodium hydroxide), the decoating liquid poor stability of this single component, adopt this decoating liquid not stablize and carry out electrolytic deplating process, so that the chromium carbide film can not be effectively, fully stripping, and, also damage easily base material.
Summary of the invention
In view of this, be necessary to provide a kind of and do not damage under the base material prerequisite, can stablize, the decoating liquid of removing chromium carbide film layer effectively.
In addition, also be necessary to provide a kind of method of using above-mentioned decoating liquid electrolytic removal chromium carbide rete.
A kind of decoating liquid of chromium carbide rete, this decoating liquid are the aqueous solution that contains alkali, promotor and auxiliary, and wherein said alkali is soluble alkali metal oxyhydroxide, and the concentration of alkali is 20 ~ 200g/L; This promotor is the complexing agent that complexing action is arranged with chromium ion, and the concentration of this promotor is 40 ~ 150g/L; This auxiliary is a kind of or its combination in tripoly phosphate sodium STPP and five sodium polyphosphates, and the concentration of auxiliary is 0.5 ~ 10g/L.
A kind of method of electrolytic removal chromium carbide rete comprises: the base material that will be formed with the chromium carbide rete soaks and places 50 ~ 95 ℃ decoating liquid, and with this decoating liquid as electrolytic solution, with this base material that is formed with the chromium carbide rete as anode, with 1 ~ 10A/dm
2Current density carry out electrolysis, make the stripping of this chromium carbide rete; Base material behind the strip is washed and drying; Wherein this decoating liquid is decoating liquid of the present invention.
Compared to prior art, substrate surface was not corroded after the stripping method of the decoating liquid of described chromium carbide rete and electrolytic removal chromium carbide rete made and moves back film, and can stablize, removing chromium carbide film layer effectively.
Embodiment
Decoating liquid of the present invention is applicable to strip the chromium carbide rete that is formed at substrate surface.Described base material comprises ferrous alloy (such as stainless steel), copper, copper alloy and plastics.
Decoating liquid of the present invention is the aqueous solution that contains alkali, promotor and auxiliary.Wherein said alkali can be soluble alkali metal oxyhydroxide, for example, can be a kind of or its combination in sodium hydroxide and the potassium hydroxide.The concentration of this alkali can be 20 ~ 200g/L, is preferably 50 ~ 100g/L.Described alkali plays electric action in decoating liquid, alkaline environment is provided simultaneously, and the chromium in the chromium carbide rete can be dissolved in the decoating liquid.
This promotor is for there being with chromium ion the complexing agent of complexing action, as being one or more the mixture in the compounds such as Seignette salt, Sunmorl N 60S, Trisodium Citrate and ethylenediamine tetraacetic acid (EDTA) (EDTA), be preferably the mixture of Sunmorl N 60S and Trisodium Citrate or Sunmorl N 60S and ethylenediamine tetraacetic acid (EDTA) (EDTA).The concentration of promotor is 20 ~ 150g/L, is preferably 40 ~ 100g/L.After chromium in the chromium carbide rete is dissolved in decoating liquid, with promotor complexing action occurs and form complex compound, therefore is conducive to the lasting dissolving of the chromium in the chromium carbide rete.
Auxiliary can be soluble poly phosphoric acid salt compound, for example can be a kind of or its combination in tripoly phosphate sodium STPP and five sodium polyphosphates, is preferably five sodium polyphosphates.The concentration of auxiliary is 0.5 ~ 10g/L, is preferably 2 ~ 8g/L.Auxiliary is conducive to strengthen electrolysis finish after to the washing effect of base material, can make the decoating liquid that is attached on the base material faster, more completely be cleaned clean, to avoid residual decoating liquid to the corrosion of base material.
This decoating liquid can be by making above-mentioned alkali, promotor and auxiliary are water-soluble.
Utilize the method for the chromium carbide rete on the above-mentioned decoating liquid stripping base material to comprise, decoating liquid is heated to 50 ~ 95 ℃, the base material that will be formed with the chromium carbide rete soaks and places decoating liquid, and with this decoating liquid as electrolytic solution, with this base material that is formed with the chromium carbide rete as anode, as negative electrode, carry out electrolysis with the current density of 1 ~ 10A/dm2 with stainless steel plate or carbon plate, this chromium carbide rete is stripped fully.Preferred 4 ~ the 7A/dm2 of described current density.Behind the strip, base material is washed and drying.
The present invention is described in more detail below by embodiment.
Embodiment 1
1. preparation decoating liquid
70g sodium hydroxide slowly is dissolved in the 500ml deionized water, then adds 50g Trisodium Citrate, 30g Sunmorl N 60S, 2g five sodium polyphosphates, mending deionized water fully after the dissolving, to make liquor capacity be 1L, obtains decoating liquid.
2. electrolytic removal chromium carbide rete
Decoating liquid is heated to 60 ~ 70 ℃, it is that the sample of the chromium carbide rete of about 2 μ m soaks and places decoating liquid that the stainless steel substrate surface is formed with thickness, and with this decoating liquid as electrolytic solution, with this stainless steel substrate that is formed with the chromium carbide rete as anode, make negative electrode with carbon plate, use 5A/dm
2Current density electrolysis 6 minutes, this chromium carbide rete is stripped fully.Behind the electrolytic deplating process, stainless steel substrate is washed and drying.
Embodiment 2
1. preparation decoating liquid
60g sodium hydroxide slowly is dissolved in the 500ml deionized water, then adds 30g Trisodium Citrate, 40g Sunmorl N 60S, 6g five sodium polyphosphates, mending deionized water fully after the dissolving, to make liquor capacity be 1L, obtains decoating liquid.
2. stripping rete
Decoating liquid is heated to 60 ~ 70 ℃, it is that the sample of the chromium carbide rete of about 2 μ m soaks and places decoating liquid that the stainless steel substrate surface is formed with thickness, and with this decoating liquid as electrolytic solution, with this stainless steel substrate that is formed with the chromium carbide rete as anode, make negative electrode with carbon plate, use 5A/dm
2Current density electrolysis 6 minutes, this chromium carbide rete is stripped fully.Behind the electrolytic deplating process, stainless steel substrate is washed and drying.
Embodiment 3
1. preparation decoating liquid
50g sodium hydroxide slowly is dissolved in the 500ml deionized water, then adds 20g ethylenediamine tetraacetic acid (EDTA) (EDTA), 40g Sunmorl N 60S, 4g five sodium polyphosphates, mending deionized water fully after the dissolving, to make liquor capacity be 1L, obtains decoating liquid.
2. stripping rete
Decoating liquid is heated to 60 ~ 70 ℃, it is that the sample of the chromium carbide rete of about 3 μ m soaks and places decoating liquid that the stainless steel substrate surface is formed with thickness, and with this decoating liquid as electrolytic solution, with this stainless steel substrate that is formed with the chromium carbide rete as anode, make negative electrode with carbon plate, use 6A/dm
2Current density electrolysis 5 minutes, this chromium carbide rete is stripped fully.Behind the electrolytic deplating process, stainless steel substrate is washed and drying.
Embodiment 4-6
Respectively according to the method described in embodiment 1-3 preparation decoating liquid, different is, the stainless steel substrate among the embodiment 1-3 is replaced with carbon steel, carries out electrolysis and move back film under identical with embodiment 1-3 respectively condition.
Sample behind the stripping rete in above-described embodiment 1 to embodiment 6 is done X-ray diffraction (X-RD) analysis, do not find that all the Cr element exists, and proves that rete strips fully; Sample behind the stripping rete is carried out scanning electron microscope (SEM) test, find that base material all is not corroded.
Claims (11)
1. the decoating liquid of a chromium carbide rete, it is characterized in that: this decoating liquid is the aqueous solution that contains alkali, promotor and auxiliary, and wherein said alkali is soluble alkali metal oxyhydroxide, and the concentration of alkali is 20 ~ 200g/L; This promotor is the complexing agent that complexing action is arranged with chromium ion, and the concentration of this promotor is 20 ~ 150g/L; This auxiliary is a kind of or its combination in tripoly phosphate sodium STPP and five sodium polyphosphates, and the concentration of auxiliary is 0.5 ~ 10g/L.
2. the decoating liquid of chromium carbide rete as claimed in claim 1, it is characterized in that: described alkali is a kind of or its combination in sodium hydroxide and the potassium hydroxide.
3. the decoating liquid of chromium carbide rete as claimed in claim 1, it is characterized in that: the concentration of described alkali is 50 ~ 100g/L.
4. the decoating liquid of chromium carbide rete as claimed in claim 1 is characterized in that: described promotor is one or more the mixture in Seignette salt, Sunmorl N 60S, Trisodium Citrate and the ethylenediamine tetraacetic acid (EDTA).
5. the decoating liquid of chromium carbide rete as claimed in claim 4, it is characterized in that: described promotor is the mixture of Sunmorl N 60S and Trisodium Citrate or Sunmorl N 60S and ethylenediamine tetraacetic acid (EDTA).
6. the decoating liquid of chromium carbide rete as claimed in claim 1, it is characterized in that: the concentration of described promotor is 40 ~ 100g/L.
7. the decoating liquid of chromium carbide rete as claimed in claim 1 is characterized in that: the concentration 2 ~ 8g/L of described auxiliary.
8. the method for an electrolytic removal chromium carbide rete, may further comprise the steps: the base material that will be formed with the chromium carbide rete soaks and places 50 ~ 95 ℃ decoating liquid, and with this decoating liquid as electrolytic solution, with this base material that is formed with the chromium carbide rete as anode, with 1 ~ 10A/dm
2Current density carry out electrolysis, make the stripping of this chromium carbide rete; Base material behind the strip is washed and drying; Wherein this decoating liquid is such as the described decoating liquid of claim 1 ~ 7 any one.
9. the method for electrolytic removal chromium carbide rete as claimed in claim 8, it is characterized in that: described current density is 4 ~ 7A/dm
2
10. the method for electrolytic removal chromium carbide rete as claimed in claim 8, it is characterized in that: the temperature of described decoating liquid is 60 ~ 70 ℃, electrolysis time is 3 ~ 8 minutes.
11. the method for electrolytic removal chromium carbide rete as claimed in claim 8 is characterized in that: described base material is a kind of in ferrous metals, copper, copper alloy and the plastics.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010151258.3A CN102234833B (en) | 2010-04-20 | 2010-04-20 | Stripping solution and method for electrolytically removing chromium carbide film |
| US12/974,205 US20110253555A1 (en) | 2010-04-20 | 2010-12-21 | Solution for electrolytically removing chromium carbide coating and method for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010151258.3A CN102234833B (en) | 2010-04-20 | 2010-04-20 | Stripping solution and method for electrolytically removing chromium carbide film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102234833A CN102234833A (en) | 2011-11-09 |
| CN102234833B true CN102234833B (en) | 2013-05-29 |
Family
ID=44787379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010151258.3A Expired - Fee Related CN102234833B (en) | 2010-04-20 | 2010-04-20 | Stripping solution and method for electrolytically removing chromium carbide film |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20110253555A1 (en) |
| CN (1) | CN102234833B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397374B (en) * | 2013-07-29 | 2016-02-03 | 无锡商业职业技术学院 | A kind of method of ceramic condenser interior nickel stripping electrode |
| CN104195626A (en) * | 2014-08-08 | 2014-12-10 | 南开大学 | Method for removing chromium films from waste rollers without damage by utilizing chromium film removing liquid |
| CN104328477A (en) * | 2014-11-11 | 2015-02-04 | 东方电气集团东方汽轮机有限公司 | Method and tooling for stripping chromium coatings of small holes of chrome-plated part of nuclear control rod driving mechanism of nuclear power unit |
| CN107338469B (en) * | 2017-06-01 | 2018-06-19 | 江门市江汇电镀有限公司 | A kind of method of ironware surface zinc layers and chromium passivating layer electrolytic deplating process |
| CN107759109A (en) * | 2017-09-22 | 2018-03-06 | 深圳市永安精细化工有限公司 | Glass is removed under a kind of normal temperature, coating takes off plating solution on ceramics |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886588A (en) * | 1989-04-10 | 1989-12-12 | Union Carbide Corporation | Electrolytic method of and bath for stripping coating from aluminum bases |
| CN101054715A (en) * | 2007-02-26 | 2007-10-17 | 内蒙古第一机械制造（集团）有限公司 | Electrochemical copper removing solution |
| CN101565850A (en) * | 2008-04-25 | 2009-10-28 | 比亚迪股份有限公司 | Removing liquid of chromium nitride film layer and removing method of film layer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7323416B2 (en) * | 2001-03-14 | 2008-01-29 | Applied Materials, Inc. | Method and composition for polishing a substrate |
| US20040262168A1 (en) * | 2003-06-25 | 2004-12-30 | Jinshan Huo | Methods of electopolishing patterned substrates |
| US7390744B2 (en) * | 2004-01-29 | 2008-06-24 | Applied Materials, Inc. | Method and composition for polishing a substrate |
-
2010
- 2010-04-20 CN CN201010151258.3A patent/CN102234833B/en not_active Expired - Fee Related
- 2010-12-21 US US12/974,205 patent/US20110253555A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886588A (en) * | 1989-04-10 | 1989-12-12 | Union Carbide Corporation | Electrolytic method of and bath for stripping coating from aluminum bases |
| CN101054715A (en) * | 2007-02-26 | 2007-10-17 | 内蒙古第一机械制造（集团）有限公司 | Electrochemical copper removing solution |
| CN101565850A (en) * | 2008-04-25 | 2009-10-28 | 比亚迪股份有限公司 | Removing liquid of chromium nitride film layer and removing method of film layer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102234833A (en) | 2011-11-09 |
| US20110253555A1 (en) | 2011-10-20 |
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