CN111926359A - Zinc-nickel alloy electroplating solution and electroplating method - Google Patents
Zinc-nickel alloy electroplating solution and electroplating method Download PDFInfo
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- CN111926359A CN111926359A CN202010950182.4A CN202010950182A CN111926359A CN 111926359 A CN111926359 A CN 111926359A CN 202010950182 A CN202010950182 A CN 202010950182A CN 111926359 A CN111926359 A CN 111926359A
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- electroplating
- electroplating solution
- mass ratio
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- complexing agent
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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
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
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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
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The invention provides a zinc-nickel alloy electroplating solution, which comprises: 20-50 g/L of zinc oxide; 30-40 g/L of nickel sulfate; 3-5 g/L neodymium acetate; 100-150 g/L potassium hydroxide; 20-40 g/L of a complexing agent; 5-10 g/L of brightener and water. According to the invention, 3-5 g/L neodymium acetate is added into the electroplating solution, so that the deep plating capability is good, and the formed plating layer has good wear resistance and high brightness. Meanwhile, polyethyleneimine and triethanolamine in a mass ratio of 1-3: 4-6 are used as a complexing agent, vanillin and propargyl sodium sulfonate in a mass ratio of 1: 3-5 are used as a brightening agent, and the flatness and brightness of the coating can be further improved. Experimental results show that the electroplating solution provided by the invention has good deep plating capability, high leveling degree and no bubbling.
Description
Technical Field
The invention relates to the technical field of electroplating, in particular to a zinc-nickel alloy electroplating solution and an electroplating method.
Background
The zinc-nickel alloy coating is an excellent protective coating and is mainly applied to aerospace, automobile industry and mechanical and electronic products. In the surface corrosion prevention and protection of parts in the electrical field, the zinc-nickel alloy film layer is required to have excellent corrosion resistance, wear resistance, hardness and the like as a final protective film layer.
With the rapid development of modern industry and scientific technology, higher and higher requirements are also put forward on the surface corrosion resistance of materials. For example, the chinese patent CN109252194A discloses a zinc-nickel alloy electroplating solution, which comprises zinc oxide, sodium hydroxide, a nickel extender, a nickel complexing agent, a brightener M and a brightener B, and the plating layer formed by the zinc-nickel alloy electroplating solution disclosed in the patent has no bubbling and good wear resistance, but has poor deep plating performance, and is not suitable for electroplating of complex workpieces.
Disclosure of Invention
In view of the above, the present invention provides a zinc-nickel alloy electroplating solution and an electroplating method thereof, wherein the electroplating solution has good deep plating capability, and the formed plating layer has good wear resistance and high brightness.
The invention provides a zinc-nickel alloy electroplating solution, which comprises:
20-50 g/L of zinc oxide;
30-40 g/L of nickel sulfate;
3-5 g/L neodymium acetate;
100-150 g/L potassium hydroxide;
20-40 g/L of a complexing agent;
5-10 g/L of brightener and water.
Preferably, the complexing agent comprises polyethyleneimine and triethanolamine in a mass ratio of 1-3: 4-6.
Preferably, the brightening agent comprises vanillin and propargyl sodium sulfonate in a mass ratio of 1: 3-5.
Preferably, the plating solution comprises:
40g/L of zinc oxide;
35g/L of nickel sulfate;
4g/L neodymium acetate;
120g/L of potassium hydroxide;
35g/L of complexing agent;
10g/L of brightener and water.
Preferably, the complexing agent comprises polyethyleneimine and triethanolamine in a mass ratio of 2: 5.
Preferably, the brightening agent comprises vanillin and propargyl sodium sulfonate in a mass ratio of 1: 4.
The invention also provides an electroplating method of the metal workpiece, which comprises the following steps:
electroplating is carried out in the electroplating solution as claimed in any one of claims 1 to 6, with a workpiece to be plated as a cathode and graphite as an anode.
Preferably, the electroplating temperature is 20-30 ℃, the time is 10-30 min, and the current density is 0.1-5A/dm2。
According to the invention, 3-5 g/L neodymium acetate is added into the electroplating solution, so that the deep plating capability is good, and the formed plating layer has good wear resistance and high brightness. Meanwhile, polyethyleneimine and triethanolamine in a mass ratio of 1-3: 4-6 are used as a complexing agent, vanillin and propargyl sodium sulfonate in a mass ratio of 1: 3-5 are used as a brightening agent, and the flatness and brightness of the coating can be further improved. Experimental results show that the electroplating solution provided by the invention has good deep plating capability, high leveling degree and no bubbling.
Detailed Description
Examples 1 to 6
The components were mixed thoroughly and homogeneously to prepare an electroplating solution according to the formulation shown in table 1.
TABLE 1 formulation of electroplating baths for examples
Comparative examples 1 to 4
The components were mixed thoroughly and homogeneously to prepare an electroplating solution according to the formulation shown in table 2.
TABLE 2 formulation of plating solution for comparative example
Application example
The electroplating solution shown in examples 1 to 7 and comparative examples 1 to 4 was used to electroplate a workpiece to be plated, and the method was as follows:
the copper tube with the diameter of 10mm, the tube wall thickness of 1mm and the length of 100mm is used as a cathode, graphite is used as an anode, and electroplating is carried out in the electroplating solution, the electroplating temperature is 25 ℃, and the current density is 2.5A/dm2Electroplating for 20 min.
The cathode of the copper tube is taken out, the ratio of the length and the tube diameter of the inner wall coating is cut and measured along the axial direction, and the deep plating capacity of the plating solution is evaluated according to the ratio, and the result is shown in table 3.
TABLE 3 throwing power of the plating solution
Deep plating ability | |
Example 1 | 8.7 |
Example 2 | 7.9 |
Example 3 | 9.2 |
Example 4 | 9.8 |
Example 5 | 8.9 |
Example 6 | 8.5 |
Example 7 | 8.7 |
Comparative example 1 | 6.6 |
Comparative example 2 | 6.4 |
Comparative example 3 | 6.1 |
Comparative example 4 | 5.9 |
As can be seen from Table 1, the plating solution provided by the present invention has good throwing power.
Electroplating in the above electroplating solution at 25 deg.C and current density of 2A/dm with aluminum tube of 10mm diameter as cathode and graphite as anode2Electroplating for 20min to form a coating on the surface of the aluminum tube.
The flatness of the plating was measured by a profilometer, and the results are shown in Table 4.
TABLE 4 leveling of the coating according to the invention
Leveling value before plating | Leveling value after plating | Flatness (%) | |
Example 1 | 0.38 | 0.10 | 73.7 |
Example 2 | 0.42 | 0.12 | 71.4 |
Practice ofExample 3 | 0.41 | 0.09 | 78.0 |
Example 4 | 0.45 | 0.09 | 80 |
Example 5 | 0.42 | 0.10 | 76.2 |
Example 6 | 0.43 | 0.11 | 74.4 |
Example 7 | 0.43 | 0.12 | 72.1 |
Comparative example 1 | 0.44 | 0.15 | 65.9 |
Comparative example 2 | 0.37 | 0.15 | 59.5 |
Comparative example 3 | 0.46 | 0.17 | 63.0 |
Comparative example 4 | 0.38 | 0.16 | 57.9 |
The aluminum pipe sample after plating was kept in an oven at 300 ℃ for 1 hour, then cooled in water at 50 ℃ to observe whether the plating layer had blistering or not, and the results are shown in Table 5.
TABLE 5 whether the coating according to the invention blisters
Whether or not the plating layer is blistered | |
Example 1 | Without foaming |
Example 2 | Without foaming |
Example 3 | Without foaming |
Example 4 | Without foaming |
Example 5 | Without foaming |
Example 6 | Without foaming |
Example 7 | Without foaming |
Comparative example 1 | Slight bubbling with a bubbling amount of less than 3 |
Comparative example 2 | Foaming, the amount of foaming being greater than 5 |
Comparative example 3 | Foaming, the amount of foaming being greater than 5 |
Comparative example 4 | Foaming, the amount of foaming being greater than 5 |
As is clear from tables 4 and 5, the plating solutions provided by the present invention provide plating layers having high flatness and no blistering.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A zinc-nickel alloy electroplating bath comprising:
20-50 g/L of zinc oxide;
30-40 g/L of nickel sulfate;
3-5 g/L neodymium acetate;
100-150 g/L potassium hydroxide;
20-40 g/L of a complexing agent;
5-10 g/L of brightener and water.
2. The electroplating solution as set forth in claim 1, wherein the complexing agent comprises polyethyleneimine and triethanolamine in a mass ratio of 1-3: 4-6.
3. The electroplating solution as set forth in claim 1, wherein the brightener comprises vanillin and sodium propargyl sulfonate in a mass ratio of 1: 3 to 5.
4. The plating solution as set forth in claim 1, comprising:
40g/L of zinc oxide;
35g/L of nickel sulfate;
4g/L neodymium acetate;
120g/L of potassium hydroxide;
30g/L of complexing agent;
8g/L of brightener and water.
5. The electroplating bath as set forth in claim 4 wherein the complexing agent comprises polyethyleneimine and triethanolamine in a 2: 5 mass ratio.
6. The electroplating bath as recited in claim 5 wherein the brightener comprises vanillin and sodium propargyl sulfonate in a 1: 4 mass ratio.
7. A method of electroplating a metal workpiece comprising:
electroplating is carried out in the electroplating solution as claimed in any one of claims 1 to 6, with a workpiece to be plated as a cathode and graphite as an anode.
8. The point-reading method according to claim 7, wherein the electroplating temperature is 20-30 ℃, the time is 10-30 min, and the current density is 0.1-5A/dm2。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101942684A (en) * | 2010-10-09 | 2011-01-12 | 济南德锡科技有限公司 | Alkaline electroplating Zn-Ni alloy additive, electroplating solution and preparation method |
CN108823614A (en) * | 2018-06-28 | 2018-11-16 | 浙江俊荣五金工业有限公司 | Galvanizing flux |
CN111455419A (en) * | 2020-05-20 | 2020-07-28 | 朱玉兰 | Metal surface zinc-nickel alloy electroplating solution and electroplating process |
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2020
- 2020-09-11 CN CN202010950182.4A patent/CN111926359A/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101942684A (en) * | 2010-10-09 | 2011-01-12 | 济南德锡科技有限公司 | Alkaline electroplating Zn-Ni alloy additive, electroplating solution and preparation method |
CN108823614A (en) * | 2018-06-28 | 2018-11-16 | 浙江俊荣五金工业有限公司 | Galvanizing flux |
CN111455419A (en) * | 2020-05-20 | 2020-07-28 | 朱玉兰 | Metal surface zinc-nickel alloy electroplating solution and electroplating process |
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