CN102912387A - Chloride type trivalent chromium black chromium plating solution - Google Patents
Chloride type trivalent chromium black chromium plating solution Download PDFInfo
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- CN102912387A CN102912387A CN2012104160706A CN201210416070A CN102912387A CN 102912387 A CN102912387 A CN 102912387A CN 2012104160706 A CN2012104160706 A CN 2012104160706A CN 201210416070 A CN201210416070 A CN 201210416070A CN 102912387 A CN102912387 A CN 102912387A
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Abstract
The invention discloses a chloride type trivalent chromium black chromium plating solution which comprises the following components by weight: 30 to 70g/L of chromium trichloride, 150-320g/L of conducting salt, 20 to 70g/L of complexing agent, 2 to 10g/L of blackening agent, and 0.2 to 1g/L of surfactant, wherein the conducting salt is one of or a mixture of potassium chloride, sodium chloride, ammonia chloride, sodium sulfate and potassium sulfate; the complexing agent is one of or a mixture of ammonium oxalate, malic acid and formic acid; and the blackening agent is one of or a mixture of ferric chloride, potassium thiocyanate, ammonium thiocyanate and cobalt nitrate. According to the chloride type trivalent chromium black chromium plating solution, a trivalent black chromium plating layer with thickness being 0.2 to 0.5microns can be obtained, an appearance of the plating layer is uniform and bright black, and the colors of a high electric current density region and a low electric current density region are essentially identical; and the chloride type trivalent chromium black chromium plating solution does not yellow or change color even if being placed in air in a plum rain season, and the mildews can not be found.
Description
Technical field
The invention belongs to the electroplating chemical technical field, relate in particular to trivalent chromium plating technique.
Background technology
Trivalent chromium plating is that exploitation recent years enters one of plating of industrial application, but that still is that all right is ripe for present trivalent chromium black chromium plating technique, it is even that plating black trivalent chromium coating is out walked the irregular colour in potential difference and high current density region and low current density district, the erosion resistance of coating is relatively poor, mildew appears in easily jaundice in air.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of chloride type trivalent chromium black chromium plating plating bath, the trivalent chromium Deposit appearance of acquisition is uniform bright black, and mildew does not appear in long-term placement nondiscoloration yet in air.
Technical scheme: for solving the problems of the technologies described above, the present invention by the following technical solutions: a kind of chloride type trivalent chromium black chromium plating plating bath comprises the component of following massfraction:
Chromium chloride 30～70g/L;
Conducting salt 150～320g/L;
Complexing agent 20～70g/L;
Blackening agent 2～10g/L;
Tensio-active agent 0.2～1g/L;
Wherein, described conducting salt is one or more the mixture in Repone K, sodium-chlor, ammonium chloride, sodium sulfate, the vitriolate of tartar; Described complexing agent is one or more the mixture in ammonium oxalate, oxysuccinic acid, the formic acid; Described blackening agent is one or more the mixing in iron(ic) chloride, potassium sulfocyanate, ammonium thiocyanate, the Jing Ti/Bao Pian COBALT NITRATE CRYSTALS/FLAKES.
As preferably, described tensio-active agent is one or more the mixture in sodium lauryl sulphate, bay spring sodium sulfate, Sodium dodecylbenzene sulfonate or the dioctyl amber sodium sulfonate.
As preferably, described complexing agent is ammonium oxalate and formic acid; Described blackening agent is the mixture of ammonium thiocyanate and iron(ic) chloride.
Beneficial effect: compared with prior art, the present invention has the following advantages: can obtain the trivalent black chromium plating of 0.2～0.5 micron thick, Deposit appearance is even bright black, and high current density region and low current density district color are basically identical; And the long-term placement variable color of not turning to be yellow also has no mildew in the plum rain season air.
Embodiment
The below is further described the present invention.
A kind of chloride type trivalent chromium black chromium plating plating bath adds a certain amount of pure water, and is heated to 70～90 ℃ in plating tank, then add the Repone K of 50g/L, the sodium-chlor of 120g/L and the ammonium chloride of 90g/L, stirs fully dissolving.Then add the chromium chloride about 40g/L, stir fully dissolving, then open filter and filter, and large electric current and little electric current replace the above removal of impurities of electrolysis 1h.Then add iron(ic) chloride and make iron ion content in the plating bath between 250～500ppm, continue to add ammonium oxalate, the oxysuccinic acid of 10g/L and the formic acid of 6ml/L of 40g/L, stir fully dissolving, add at last the ammonium thiocyanate of 1～10g/L.
Hull trough test, test conditions are 8A, 2min.Along with iron concentration is brought up to 500ppm from 250ppm, coating is walked capability and is improved gradually and can reach 8.2cm, and color has and necessarily increase blackly, continues to promote concentration, and plating speed descends obviously on the coating, and optimum content is 350～400ppm; Content the best of ammonium thiocyanate is 2.5g/L, and this moment, coating was even black, and color is dark light tone, and along with concentration continues to promote, color is flavescence gradually, inhomogeneous jaundice can occur, grow dim when surpassing 10g/L.Therefore conducting salt mainly improves specific conductivity among the present invention, in the situation that allow, concentration is more high better.
Claims (3)
1. chloride type trivalent chromium black chromium plating plating bath is characterized in that comprising the component of following massfraction:
Chromium chloride 50～100g/L;
Conducting salt 120～220g/L;
Complexing agent 20～50g/L;
Blackening agent 2～10g/L;
Tensio-active agent 0.2～1g/L;
Wherein, described conducting salt is one or more the mixture in Repone K, sodium-chlor, ammonium chloride, sodium sulfate, the vitriolate of tartar; Described complexing agent is one or more the mixture in ammonium oxalate, oxysuccinic acid, the formic acid; Described blackening agent is one or more the mixing in iron(ic) chloride, potassium sulfocyanate, ammonium thiocyanate, the Jing Ti/Bao Pian COBALT NITRATE CRYSTALS/FLAKES.
2. described chloride type trivalent chromium black chromium plating plating bath according to claim 1 is characterized in that: described tensio-active agent is one or more the mixture in sodium lauryl sulphate, bay spring sodium sulfate, Sodium dodecylbenzene sulfonate or the dioctyl amber sodium sulfonate.
3. described chloride type trivalent chromium black chromium plating plating bath according to claim 1, it is characterized in that: described complexing agent is ammonium oxalate and formic acid; Described blackening agent is the mixture of ammonium thiocyanate and iron(ic) chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104160706A CN102912387A (en) | 2012-10-26 | 2012-10-26 | Chloride type trivalent chromium black chromium plating solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104160706A CN102912387A (en) | 2012-10-26 | 2012-10-26 | Chloride type trivalent chromium black chromium plating solution |
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| Publication Number | Publication Date |
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| CN102912387A true CN102912387A (en) | 2013-02-06 |
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Family Applications (1)
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| CN2012104160706A Pending CN102912387A (en) | 2012-10-26 | 2012-10-26 | Chloride type trivalent chromium black chromium plating solution |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106149023A (en) * | 2015-04-23 | 2016-11-23 | 思维福特南通精密机械有限公司 | Bearing block processing technique |
| CN111962105A (en) * | 2020-09-11 | 2020-11-20 | 广东涂乐师新材料科技有限公司 | Trivalent black chromium electroplating agent simple to mix and preparation method thereof |
| CN112226791A (en) * | 2020-10-26 | 2021-01-15 | 厦门市金宝源实业有限公司 | Trivalent chromium plating solution, preparation method thereof and trivalent chromium plating method |
| CN116770375A (en) * | 2023-06-06 | 2023-09-19 | 中山博美新材料科技有限公司 | Plating solution for black chromium plating layer, and preparation method and application thereof |
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| CN101092721A (en) * | 2006-06-19 | 2007-12-26 | 比亚迪股份有限公司 | Solution in use for plating trivalent chromium, and plating method for using the plating solution |
| CN101967662A (en) * | 2010-10-26 | 2011-02-09 | 广东多正化工科技有限公司 | Trivalent chromium electroplate liquid capable of forming black clad layer |
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| WO2012060918A1 (en) * | 2010-11-05 | 2012-05-10 | Macdermid Acumen, Inc. | Dark colored chromium based electrodeposits |
| WO2012084262A1 (en) * | 2010-12-23 | 2012-06-28 | Coventya S.P.A. | Substrate with a corrosion resistant coating and method of production thereof |
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2012
- 2012-10-26 CN CN2012104160706A patent/CN102912387A/en active Pending
Patent Citations (5)
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| CN101092721A (en) * | 2006-06-19 | 2007-12-26 | 比亚迪股份有限公司 | Solution in use for plating trivalent chromium, and plating method for using the plating solution |
| CN101967662A (en) * | 2010-10-26 | 2011-02-09 | 广东多正化工科技有限公司 | Trivalent chromium electroplate liquid capable of forming black clad layer |
| WO2012060918A1 (en) * | 2010-11-05 | 2012-05-10 | Macdermid Acumen, Inc. | Dark colored chromium based electrodeposits |
| CN102011112A (en) * | 2010-12-15 | 2011-04-13 | 济南德锡科技有限公司 | Zinc and zinc alloy plating black passivation solution and preparation method thereof |
| WO2012084262A1 (en) * | 2010-12-23 | 2012-06-28 | Coventya S.P.A. | Substrate with a corrosion resistant coating and method of production thereof |
Non-Patent Citations (4)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106149023A (en) * | 2015-04-23 | 2016-11-23 | 思维福特南通精密机械有限公司 | Bearing block processing technique |
| CN111962105A (en) * | 2020-09-11 | 2020-11-20 | 广东涂乐师新材料科技有限公司 | Trivalent black chromium electroplating agent simple to mix and preparation method thereof |
| CN112226791A (en) * | 2020-10-26 | 2021-01-15 | 厦门市金宝源实业有限公司 | Trivalent chromium plating solution, preparation method thereof and trivalent chromium plating method |
| CN116770375A (en) * | 2023-06-06 | 2023-09-19 | 中山博美新材料科技有限公司 | Plating solution for black chromium plating layer, and preparation method and application thereof |
| CN116770375B (en) * | 2023-06-06 | 2024-01-02 | 中山博美新材料科技有限公司 | Plating solution for black chromium plating layer, and preparation method and application thereof |
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Application publication date: 20130206 |