CN105369296A - Environmental-protection barrel plating type trivalent chromium electroplating solution and barrel plating method thereof - Google Patents
Environmental-protection barrel plating type trivalent chromium electroplating solution and barrel plating method thereof Download PDFInfo
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- CN105369296A CN105369296A CN201410408590.1A CN201410408590A CN105369296A CN 105369296 A CN105369296 A CN 105369296A CN 201410408590 A CN201410408590 A CN 201410408590A CN 105369296 A CN105369296 A CN 105369296A
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- barrel plating
- trivalent chromium
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Abstract
The present invention provides an environmental-protection barrel plating type trivalent chromium electroplating solution and a barrel plating method thereof, and belongs to the field of electroplating processes. In the prior art, the current barrel plating process for chromium plating contains hexavalent chromium so as to cause high toxicity, heavy pollution, difficult wastewater treatment and other serious problems. Based on the serious problems in the prior art, an environmental-protection trivalent chromium electroplating solution suitable for barrel plating applications and a barrel plating method thereof are developed, wherein the electroplating solution mainly comprises a main salt, a complexing agent, a stabilizer, a wetting agent, an electric conduction salt, a buffer agent and water, and further comprises a migration agent. According to the present invention, the environmental-protection barrel plating type trivalent chromium electroplating solution has advantages of cleaning, no pollution, uniform and bright plating layer appearance and high corrosion resistance, and the acidity control in the process is moderate, such that the plating layer dissolving phenomenon can not be generated even if power off; and the migration agent is introduced into the environmental-protection trivalent chromium electroplating solution, such that the migration and dispersion capability of the plating layer can be effectively improved, the current efficient and the yield can be effectively improved, and the trivalent chromium is easily subjected to barrel plating on the work-piece.
Description
Invention field
The present invention relates to a kind of electroplating technology, in particular, relate to a kind of barrel plating type trivalent chromium plating technique.
Background technology
Chromium coating has good hardness, wear resistance, solidity to corrosion and ornamental, is one of most widely used plating of electroplating industry.But what electrodeposited chromium mainly adopted at present is rack plating process, extremely rare in barrel plating application, so just limit the application of chrome-plated process in finding plating.Studying carefully its major cause is because chrome-plated process walks, dispersive ability is poor, often there will be low district and plates situation about not covering.Simply electroplate without the part in low district even if traditional barrel plating technique also can only be used for some, particularly easily occur coating acid dissolve during power-off.The corrosion resistance of coating obtained is poor, coating is partially black, and overall cost is very high.
And barrel plating technique contains sexavalent chrome, there are the serious problems such as toxicity is large, pollution is heavy, wastewater treatment is difficult.The existence of the problems referred to above forces chromium barrel plating technique cannot obtain good promotion and application always.
Therefore, the environmental protection trivalent chromium plating technique developing a kind of applicable barrel plating application has just just been of great significance.
Summary of the invention
For the problems referred to above, the invention provides a kind of environmental protection barrel plating type trivalent chromium plating solution and method of barrel electroplating thereof.
First object of the present invention, be to provide a kind of environmental protection barrel plating type trivalent chromium plating solution, this electroplate liquid cleanliness without any pollution in electroplating process, has splendid dispersive ability.
In order to realize first object of the present invention, the invention provides a kind of environmental protection barrel plating type trivalent chromium plating solution, this electroplate liquid, primarily of main salt, complexing agent, stablizer, wetting agent, conducting salt, buffer reagent and water composition, also includes the agent that walks, described main salt is at least one in chromium sulphate or potassium chromium sulfate, described complexing agent is formic acid, at least one in acetic acid and tribromoacetic acid and salt thereof, described stablizer is Padil, mercaptosuccinic acid sodium, at least one in sodium sorbate and sodium hypophosphite, described wetting agent is alkylphenol polyoxyethylene, at least one in hexadecyl diethanolamine Soxylat A 25-7, the described agent that walks is acrylate homopolymer sodium salt, sodium vinyl sulfonate, thiourea derivative and containing at least one in C=S heterogeneous ring compound, described buffer reagent is boric acid, Sodium Tetraborate, at least one in sodium phosphate and Trisodium Citrate, described conducting salt is potassium sulfate, sodium sulfate, at least one in ammonium sulfate.
The present invention also can do following improvement:
The described agent content that walks is 1g/L ~ 120g/L; In the described agent that walks, C=S heterogeneous ring compound is α-thiophene derivant.
Described conducting salt content is 100g/L ~ 200g/L.
Described main salts contg is 10g/L ~ 120g/L.
Described complexing agent content is 1g/L ~ 120g/L.
Described stabiliser content is 1g/L ~ 120g/L.
Described humectant content is 1g/L ~ 8g/L.
Described buffer content is 1g/L ~ 120g/L.
Another object of the present invention is to provide a kind of environmental protection sulfuric acid type trivalent chromium method of barrel electroplating using barrel plating environmental protection barrel plating type three _ _ valency chromium plating bath described in claim 1, uses this method in barrel plating process, current efficiency to be improved significantly.
In order to realize second object of the present invention, a kind of environmental protection sulfuric acid type trivalent chromium method of barrel electroplating provided by the invention, comprises the following steps:
(1) by workpiece pickling and washing;
(2) barrel plating is carried out with above-mentioned a kind of environmental protection barrel plating type trivalent chromium plating solution, condition is: temperature is 40-60 DEG C, cathode current density is 0.1-15ASD, pH value is 3-6, barrel plating time 1-30 minute, the rotating speed of cylinder is 0.5-10 rev/min, and the anode of use is DSA (DimensionallyStableAnode) iridium titanium coating anode;
(3) with water, plating piece is cleaned up, then dry up.
The present invention also can do following improvement:
In step (2), barrel plating condition is: temperature is 45-55 DEG C, barrel plating cathode current density is 2-5ASD (average current density), rack plating barrel plating current density is 6-15, pH value is 4-5, barrel plating time 20-30 minute, and the rotating speed of cylinder is 1-5 rev/min.
Compared with prior art, the beneficial effect that the present invention has is:
1) adopt a kind of environmental protection barrel plating type trivalent chromium plating solution of the present invention and method of barrel electroplating thereof, cleanliness without any pollution, Deposit appearance is evenly bright, and solidity to corrosion at least doubles than conventional barrel plating chromium;
2) a kind of environmental protection sulfuric acid type trivalent chromium method of barrel electroplating of the present invention, not fluorine-containing silicic acid, its technique acidity control is moderate, even if having a power failure also there will not be coating dissolution phenomena;
3) known by embodiment, after a kind of environmental protection barrel plating type trivalent chromium plating solution of the present invention introduces the agent that walks, effectively can improve coating and walk and dispersive ability;
4) a kind of environmental protection sulfuric acid type trivalent chromium method of barrel electroplating of the present invention effectively can improve current efficiency, reaches about 30%, improves yield rate 80-90% simultaneously, is applicable to barrel plating trivalent chromium on workpiece.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but any limitation of the invention do not formed.
Following condition is adopted to carry out barrel plating experiment (plating thickness and solidity to corrosion test): coating bath is cylinder chrome-plating bath, cylinder sizes 6 inches × 8 inches (can fill product 1000 grams-2000 grams); Electroplating objects is nickel plating irony hexagonal head bolt, and nickel plating layer thick is 3 μm; PH value is 5; Drum rotational speed is 2rpm; Electroplating time is 30min; Electroplating temperature is 50 DEG C; Current density is 3ASD; Anode is DSA iridium titanium coating anode.
Following condition is adopted to carry out Hull groove experiment (dispersive ability test): coating bath is 267ml Hull groove; Electroplating objects is 10cm × 6cm nickel plating copper sheet, and nickel plating layer thick is 5 μm; PH value is 5; Electroplating time is 5min; Electroplating temperature is 50 DEG C; Current density is 10ASD; Sun level is DSA iridium titanium coating anode; Pre-treatment is through chlorohydric acid pickling and washing.
Experiment obtains sample and tests according to following project and method:
1. outward appearance: range estimation.
2. plating thickness: with the same position (the compromise position in Qu Gao district and low district) of thickness tester test plating back nut.
3. solidity to corrosion test: carry out neutral salt spray test test according to national standard GB/T 10125-1997.
4. dispersive ability test
δ 1 is 1cm place, distance Gao Qu edge thickness, and δ 2 is apart from 1cm place, edge, low district thickness.
Comparative example 1
Electroplating bath components:
Chromic anhydride: 320-350g/L
Silicofluoric acid: 4.5-5g/L
Sulfuric acid: 0.5-0.6g/L
Surplus is water
Comparative example 2
Electroplating bath components:
Potassium sulfate: 140g/L
Potassium chromium sulfate: 70g/L
Formic acid: 8g/L
Xitix: 30g/L
Glycerol: 2g/L
Boric acid: 60g/L
Surplus is water
Embodiment 1
Electroplating bath components:
Potassium sulfate: 140g/L
Potassium chromium sulfate: 70g/L
Formic acid/acetic acid/tribromoacetic acid (1: 1: 1): 8g/L
Padil: 30g/L
Alkylphenol polyoxyethylene: 2g/L
Acrylate homopolymer sodium salt: 8g/L
Boric acid: 60g/L
Surplus is water.
Claims (10)
1. an environmental protection barrel plating type trivalent chromium plating solution, primarily of main salt, complexing agent, stablizer, wetting agent, conducting salt, buffer reagent and water composition, is characterized in that: also include the agent that walks, described main salt is at least one in chromium sulphate or potassium chromium sulfate, described complexing agent is formic acid, at least one in acetic acid and tribromoacetic acid and salt thereof, described stablizer is Padil, mercaptosuccinic acid sodium, at least one in sodium sorbate and sodium hypophosphite, described wetting agent is alkylphenol polyoxyethylene, at least one in hexadecyl diethanolamine Soxylat A 25-7, the described agent that walks is acrylate homopolymer sodium salt, sodium vinyl sulfonate, thiourea derivative and containing at least one in C=S heterogeneous ring compound, described buffer reagent is boric acid, Sodium Tetraborate, at least one in sodium phosphate and Trisodium Citrate, described conducting salt is potassium sulfate, sodium sulfate, at least one in ammonium sulfate.
2. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described in the agent content that walks be 1g/L ~ 120g/L; In the described agent that walks, C=S heterogeneous ring compound is α-thiophene derivant.
3. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described conducting salt content is 100g/L ~ 200g/L.
4. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described main salts contg is 10g/L ~ 120g/L.
5. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described complexing agent content is 1g/L ~ 120g/L.
6. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described stabiliser content is 1g/L ~ 120g/L.
7. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described humectant content is 1g/L ~ 8g/L.
8. a kind of environmental protection barrel plating type trivalent chromium plating solution according to claim 1, is characterized in that: described buffer content is 1g/L ~ 120g/L.
9. an environmental protection barrel plating type trivalent chromium method of barrel electroplating, is characterized in that comprising the following steps:
(1) by workpiece pickling and washing;
(2) barrel plating is carried out with above-mentioned a kind of environmental protection barrel plating type trivalent chromium plating solution, condition is: temperature is 40-60 DEG C, cathode current density is 0.1-15ASD, pH value is 3-6, barrel plating time 1-30 minute, the rotating speed of cylinder is 0.5-10 rev/min, and the anode of use is DSA (DimensionallyStableAnode) iridium titanium coating anode;
(3) with water, plating piece is cleaned up, then dry up.
10. a kind of environmental protection barrel plating type trivalent chromium method of barrel electroplating according to claim 9, it is characterized in that: in step (2), barrel plating condition is: temperature is 45-55 DEG C, barrel plating cathode current density is 2-5ASD, rack plating barrel plating current density is 6-15, pH value is 4-5, barrel plating time 20-30 minute, the rotating speed of cylinder is 1-5 rev/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410408590.1A CN105369296A (en) | 2014-08-19 | 2014-08-19 | Environmental-protection barrel plating type trivalent chromium electroplating solution and barrel plating method thereof |
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| CN201410408590.1A CN105369296A (en) | 2014-08-19 | 2014-08-19 | Environmental-protection barrel plating type trivalent chromium electroplating solution and barrel plating method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313078A (en) * | 2016-04-27 | 2017-11-03 | 中国科学院金属研究所 | A kind of trivalent chromium plating solution and preparation method thereof |
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- 2014-08-19 CN CN201410408590.1A patent/CN105369296A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313078A (en) * | 2016-04-27 | 2017-11-03 | 中国科学院金属研究所 | A kind of trivalent chromium plating solution and preparation method thereof |
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Application publication date: 20160302 |
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