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Nano aluminium nitride composite chromium plating solution and electroplating method

A nano-aluminum nitride and chromium electroplating technology, which is applied in the direction of electrolytic coatings and coatings, can solve the problems of low hardness of the coating, restrictions on the large-scale application of Ni electroplating, and difficulty in realizing nano-composite electroplating, and achieve the effect of improving the quality of the coating

Inactive Publication Date: 2015-05-13
WUXI XUEJIANG ENVIRONMENT ENG EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chromium-based electroplating is difficult to achieve nanocomposite electroplating due to the limitation of various technical factors.
In order to make up for defects such as low chromium hardness, alloy metal elements or non-metallic elements are often added to the electroplating solution. Although the quality of the coating is improved to a certain extent, there are still problems such as low hardness of the coating, insufficient friction resistance, and poor corrosion resistance. Ideal technical defects, which severely restrict the large-scale application of Ni electroplating in industry

Method used

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  • Nano aluminium nitride composite chromium plating solution and electroplating method
  • Nano aluminium nitride composite chromium plating solution and electroplating method
  • Nano aluminium nitride composite chromium plating solution and electroplating method

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preparation example Construction

[0032] (1) Preparation of nano-dispersion. Using self-made nano-aluminum nitride after impurity removal, the preparation method of nano-aluminum nitride and the specific process of impurity removal have been described above, and will not be repeated here. Add the fatty alkyl methyl halide and alkylbenzene sulfonate into the three-necked flask to dissolve and then stir with a mixer at low speed for several minutes. Then, transfer it to a large beaker and install the GR-I shear disperser of Chengdu Xindu Yongtong Machinery Factory, add the powder of nano-aluminum nitride into the three-necked flask, and adjust the speed of the shear disperser to 300~ 500rpm, the shear dispersion time is 5-10min, then adjust the rotational speed to 1500-2000rpm, and the shear dispersion time is 10-15min to obtain the nano slurry. The average particle size of the nano-dispersion was tested by a Mastersizer 2000 laser particle size analyzer from Malvern.

[0033] (2) Weigh the mass of other raw m...

Embodiment 1

[0039] The formula of nano-aluminum nitride composite chromium electroplating solution is as follows:

[0040]

[0041] In the nano-dispersion liquid preparation, the rotating speed of low-speed shear dispersion is 300rpm, and the time of low-speed shear dispersion is 5min; the rotational speed of high-speed shear dispersion is 1500rpm, and the time of high-speed shear dispersion is 10min; the ultrasonic dispersion power is 600W, The time of ultrasonic dispersion is 6min, and the average particle size of carbon nanometer in the prepared dispersion is 20nm; the plating process conditions: the pulse width of single pulse square wave current is 1ms, the duty ratio is 30%, and the average current density is 4A / dm 2 ; The pH is 2.5, the temperature is 25°C, and the electroplating time is 120min.

Embodiment 2

[0043] The formula of nano-aluminum nitride composite chromium electroplating solution is as follows:

[0044]

[0045]

[0046] In the nano-dispersion liquid preparation, the rotating speed of low-speed shear dispersion is 500rpm, and the time of low-speed shear dispersion is 10min; the rotational speed of high-speed shear dispersion is 2000rpm, and the time of high-speed shear dispersion is 15min; the ultrasonic dispersion power is 1000W, The time of ultrasonic dispersion is 3min, and the average particle size of carbon nanoparticles in the prepared dispersion is 30nm; the plating process conditions: the pulse width of single pulse square wave current is 1ms, the duty cycle is 25%, and the average current density is 5A / dm 2 ; The pH is 3, the temperature is 30°C, and the electroplating time is 100min.

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Abstract

The invention discloses a nano aluminium nitride composite chromium plating solution and an electroplating method. The nano aluminium nitride composite chromium plating solution comprises the following components by content: 150-210g / L chromic chloride hexahydrate, 120-140g / L citrate, 40-60g / L oxalate, 60-90g / L urea, 10-20g / L formic acid, 90-120g / L ammonium bromide, 4-8g / L nano aluminium nitride, 0.06-0.24g / L fatty alkyl alkyl methyl halide salt and 0.024-0.06g / L alkylbenzene sulfonate. The plating solution contains nano aluminium nitride, due to self rigidity of nano aluminium nitride, the hardness and wear resistance of a plating layer are increased; on one hand, permeation of a corrosion solution can be prevented by filling the aperture of a plating layer and winding the metal crystal grain surface by nano aluminium nitride, on the other hand, a minisize primary battery is formed by nano aluminium nitride and the chromium metal microcrystal, passivation of chromium can be promoted, and corrosion resistance is increased.

Description

technical field [0001] The invention relates to the technical field of electroplating chromium technology, in particular to a nano-aluminum nitride composite chromium electroplating solution and an electroplating method. Background technique [0002] Cr is a silver-white metal with a slight bluish tint. It is easily passivated in the air, and the surface is covered with an oxide film. It has good corrosion resistance, is stable in the atmosphere, and can maintain its luster for a long time; , Sulfide, carbonate solution and organic acid are very stable. Cr has high hardness, small friction coefficient, good wear resistance, corrosion resistance and heat resistance. The Cr coating has the advantages of bright surface, high hardness, and corrosion resistance. It is a good protective and decorative coating, and is widely used in many fields such as automobiles and aerospace. However, the Cr coating will become soft at higher temperatures, and the hardness value begins to decr...

Claims

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Application Information

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IPC IPC(8): C25D3/06C25D15/00C25D5/18
CPCC25D3/06C25D5/18C25D15/00
Inventor 曾雄燕
Owner WUXI XUEJIANG ENVIRONMENT ENG EQUIP
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