CN109056005A - A method of chromium-boron alloy is prepared using electro-deposition techniques - Google Patents
A method of chromium-boron alloy is prepared using electro-deposition techniques Download PDFInfo
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- CN109056005A CN109056005A CN201811053869.7A CN201811053869A CN109056005A CN 109056005 A CN109056005 A CN 109056005A CN 201811053869 A CN201811053869 A CN 201811053869A CN 109056005 A CN109056005 A CN 109056005A
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- chromium
- boron alloy
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
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Abstract
The invention discloses a kind of methods for preparing chromium-boron alloy using electro-deposition techniques, belong to environment-protection electroplating technical field.The present invention prepares chromium-boron alloy deposition layer using trivalent chromium solutions, reduces the pollution to environment, reduces the harm to electroplater's health.Obtained chromium-boron alloy deposition layer surfacing, compact crystallization, good with basal body binding force, coating hardness is up to HV1000 or more.
Description
Technical field
The invention belongs to environment-protection electroplating technical field, especially a kind of trivalent chromium plating solution of application low toxicity prepares the conjunction of chromium boron
The electroplating solution and preparation method thereof of gold.
Background technique
Electrodeposited chromium layers hardness is high, has preferable wearability and corrosion resistance, and have excellent dicoration, Chang Beiyong
Make electronic electric equipment, the functional coating of the decorative coating and piston of hardware tool etc., mold, axis class etc., using very
Extensively.The electrodeposited chromium layers overwhelming majority is all using hexavalent chromium plating technique in the world now.Hexavalent chromium plating simple process, maintenance
Convenient, coating performance is good.But hexavalent chromium toxicity is very big, Excess free enthalpy will lead to skin ulcer, and hepatic and renal function is impaired, and
And there is strong carcinogenesis.Cr VI is determined as dangerous air pollutant and 17 kinds of height by Environmental Protection Agency
Spend dangerous one of toxicant.As people are to the pay attention to day by day of health and environmental protection, a kind of alternative Cr VI is developed
The New Environment Protection Technology of plating is the direction that various countries' researcher is made great efforts.
Boron element is a kind of peculiar short of electricity daughter element in the periodic table of elements, this kind of element can form stronger covalent
Key, according to hardness microscopic theory, stronger covalent bond is highly beneficial for the material for forming high rigidity.So chromium boronation is closed
Object is possible to will form the material for both having high rigidity while having both several functions.Researcher is based on density functional theory the
One property principle simulation obtains chromium boron system, and there are a large amount of crystal structures in the middle, and pass through first principle and chemical bond hybridization feelings
Condition calculating predicts the high hardness material that chromium boron compound is a kind of great potential.The high rigidity of chromium-boron alloy makes it as resistance to
There is huge application potential in terms of mill material.Preparing chromium boron layer in metal surface can be improved the hardness of metal surface and wear-resisting
Property, it is one of the direction for substituting sexavalence chrome plating.
Summary of the invention
The purpose of the present invention is to provide electroplating solutions of a kind of chromium-boron alloy and preparation method thereof.
Technical solution of the present invention:
A method of chromium-boron alloy being prepared using electro-deposition techniques, steps are as follows:
(1) chromium-boron alloy electroplating solution is prepared, is stirred more than for 24 hours；Bath pH values are controlled 1.0~5.0, preferably
3.0±0.5。
(2) workpiece degreasing and rust removal to be electroplated is cleaned up, polishes smooth, is activated with dilute hydrochloric acid；
(3) workpiece after activation is immersed in chromium-boron alloy electroplating solution, temperature control 20 DEG C~50 DEG C, preferably 35
±5℃。
(4) cathode-current density is 25~45A/dm2, preferably 30~35A/dm2。
(5) after the completion of being electroplated, workpiece is taken out, cleans up and dries up.
The chromium-boron alloy electroplating solution, bath element are as follows: 0.4~1.2mol/L of main salt, complexant 1.0~
2.5mol/L, 0.1~0.8mol/L of buffer, 0.8~2.0mol/L of conductive salt, 5~35g/L of boron additive, remaining is water.
The chromium-boron alloy electroplating solution, main salt are chromium chloride, chromium sulfate, one or both of potassium chromium sulfate with
On.
The chromium-boron alloy electroplating solution, complexant are carbon atom number less than 5 carboxylic acid or its salt, low mass molecule alcohol, urine
Element, one or more of hydrogen peroxide.
The chromium-boron alloy electroplating solution, buffer are boric acid, aluminium chloride, one or both of sodium citrate with
On.
The chromium-boron alloy electroplating solution, conductive salt are sodium chloride, ammonium chloride, potassium chloride, sodium sulphate, one in potassium sulfate
Kind is two or more.
The chromium-boron alloy electroplating solution, boron additive are sodium borohydride, dimethyamine borane, sodium tetraborate, fluoboric acid
One or more of salt.
The advantages of the present invention are: the present invention prepares chromium-boron alloy deposition layer using trivalent chromium solutions, drops
The low pollution to environment, reduces the harm to electroplater's health.Obtained chromium-boron alloy deposition layer surfacing, knot
Brilliant fine and close, good with basal body binding force, coating hardness is up to HV1000 or more.
Specific embodiment
The present invention is described in further detail below by embodiment.
Embodiment 1
Electroplating solution ingredient: chromium chloride 0.8mol/L, formic acid 0.2mol/L, acetic acid 0.4mol/L, urea 2.0mol/L, boron
Sour 0.2mol/L, sodium chloride 1.0mol/L, sodium fluoborate 6g/L, remaining is water.Above-mentioned substance is uniformly mixed, stirring for 24 hours, is matched
Electroplating solution processed, solution ph 2.8.Cathode-current density 30A/dm2, 30 DEG C of bath temperature, electroplating time 20min, plate thickness
5 μm of degree.Plated layer compact, it is bright.
Embodiment 2
Electroplating solution ingredient: chromium chloride 0.8mol/L, formic acid 0.2mol/L, acetic acid 0.4mol/L, urea 2.0mol/L, chlorine
Change sodium 0.5mol/L, ammonium chloride 0.5mol/L, boric acid 0.2mol/L, sodium fluoborate 12g/L, remaining is water.Above-mentioned substance is equal
Even mixing, stirring for 24 hours, prepare electroplating solution, solution ph 3.2.Cathode-current density 45A/dm2, 40 DEG C of bath temperature, plating
Time 20min, 7 μm of thickness of coating.Quality is preferable in the middle part of coating, and end slightly blacks.
Claims (5)
1. a kind of method for preparing chromium-boron alloy using electro-deposition techniques, which is characterized in that steps are as follows:
(1) chromium-boron alloy electroplating solution is prepared, is stirred more than for 24 hours；Bath pH values are controlled 1.0~5.0；
(2) workpiece degreasing and rust removal to be electroplated is cleaned up, polishes smooth, is activated with dilute hydrochloric acid；
(3) workpiece after activation is immersed in chromium-boron alloy electroplating solution, temperature is controlled at 20 DEG C~50 DEG C；
(4) cathode-current density is 25~45A/dm2；
(5) after the completion of being electroplated, workpiece is taken out, cleans up and dries up；
The chromium-boron alloy electroplating solution, bath element are as follows: 0.4~1.2mol/L of main salt, 1.0~2.5mol/L of complexant,
0.1~0.8mol/L of buffer, 0.8~2.0mol/L of conductive salt, 5~35g/L of boron additive, remaining is water；
The main salt is the mixing of one or more of chromium chloride, chromium sulfate, potassium chromium sulfate；
The complexant be carbon atom number less than one of 5 carboxylic acid or its salt, low mass molecule alcohol, urea, hydrogen peroxide or
Two or more mixing；
The buffer is the mixing of one or more of boric acid, aluminium chloride, sodium citrate；
The conductive salt is the mixing of one or more of sodium chloride, ammonium chloride, potassium chloride, sodium sulphate, potassium sulfate；
The boron additive is one or more of sodium borohydride, dimethyamine borane, sodium tetraborate, borofluoride
Mixing.
2. the method according to claim 1, wherein bath pH values are controlled 2.53~3.5 in step (1).
3. method according to claim 1 or 2, which is characterized in that in step (3), temperature is controlled at 30 DEG C~40 DEG C.
4. method according to claim 1 or 2, which is characterized in that in step (3), cathode-current density is 30~35A/
dm2。
5. according to the method described in claim 3, it is characterized in that, cathode-current density is 30~35A/dm in step (3)2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811053869.7A CN109056005A (en) | 2018-09-11 | 2018-09-11 | A method of chromium-boron alloy is prepared using electro-deposition techniques |
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| CN201811053869.7A CN109056005A (en) | 2018-09-11 | 2018-09-11 | A method of chromium-boron alloy is prepared using electro-deposition techniques |
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Citations (8)
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|---|---|---|---|---|
| CN1249365A (en) * | 1999-07-14 | 2000-04-05 | 昆明理工大学 | Process for electrically depositing multifunctional metal-base composite |
| CN103668345A (en) * | 2012-09-04 | 2014-03-26 | 无锡福镁轻合金科技有限公司 | Total-sulfate trivalent chromium plating solution |
| EP2635724B1 (en) * | 2010-11-04 | 2014-12-17 | Technische Universität Wien | Process for electroplating hard chromium from a cr(vi) free electrolyte |
| CN105063676A (en) * | 2015-08-17 | 2015-11-18 | 内蒙古第一机械集团有限公司 | Method for electroplating hard chromium by using trivalent chromium |
| CN105177653A (en) * | 2015-10-30 | 2015-12-23 | 姜少群 | Preparing method for composite coating on towel rail surface |
| CN105386089A (en) * | 2015-12-25 | 2016-03-09 | 武汉迪赛环保新材料股份有限公司 | Trivalent chromium hard chromium electroplating solution and application of trivalent chromium hard chromium electroplating solution in hard chromium electroplating |
| CN105917031A (en) * | 2014-01-24 | 2016-08-31 | 科文特亚共同股份公司 | Electroplating bath containing trivalent chromium and process for depositing chromium |
| CN106011957A (en) * | 2016-07-29 | 2016-10-12 | 西峡龙成特种材料有限公司 | Method for preparing nickel-boron alloy coating on continuous casting crystallizer copper plate surface |
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2018
- 2018-09-11 CN CN201811053869.7A patent/CN109056005A/en active Pending
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|---|---|---|---|---|
| CN1249365A (en) * | 1999-07-14 | 2000-04-05 | 昆明理工大学 | Process for electrically depositing multifunctional metal-base composite |
| EP2635724B1 (en) * | 2010-11-04 | 2014-12-17 | Technische Universität Wien | Process for electroplating hard chromium from a cr(vi) free electrolyte |
| CN103668345A (en) * | 2012-09-04 | 2014-03-26 | 无锡福镁轻合金科技有限公司 | Total-sulfate trivalent chromium plating solution |
| CN105917031A (en) * | 2014-01-24 | 2016-08-31 | 科文特亚共同股份公司 | Electroplating bath containing trivalent chromium and process for depositing chromium |
| CN105063676A (en) * | 2015-08-17 | 2015-11-18 | 内蒙古第一机械集团有限公司 | Method for electroplating hard chromium by using trivalent chromium |
| CN105177653A (en) * | 2015-10-30 | 2015-12-23 | 姜少群 | Preparing method for composite coating on towel rail surface |
| CN105386089A (en) * | 2015-12-25 | 2016-03-09 | 武汉迪赛环保新材料股份有限公司 | Trivalent chromium hard chromium electroplating solution and application of trivalent chromium hard chromium electroplating solution in hard chromium electroplating |
| CN106011957A (en) * | 2016-07-29 | 2016-10-12 | 西峡龙成特种材料有限公司 | Method for preparing nickel-boron alloy coating on continuous casting crystallizer copper plate surface |
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| 何晶: "电沉积非晶钴硼合金工艺", 《湖南师范大学硕士学位论文集》 * |
| 胡如南: "《实用镀铬技术》", 28 February 2013, 国防工业出版社 * |
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