Method for preparing Ni-SiC composite coating on inner surface of hollow workpiece

A technology for hollow workpieces and composite coatings, applied in coatings, electrolytic coatings, etc., can solve problems such as easy inclusions, large surface roughness, rough and loose composite coating surfaces, etc., and achieve concentration polarization, fast deposition rate, and cathode Polarized good effect

Active Publication Date: 2017-04-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0007] In order to overcome the large surface roughness of the composite coating in the prior art, the surface of the composite coating is rough and loose, prone to nodules, easy to be mixed, and the non-working surface will inevitably be subject to a certain degree of low corrosion or composite coating deposits. , the present invention proposes a method for preparing a Ni-SiC composite coating on the inner surface of a hollow workpiece

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  • Method for preparing Ni-SiC composite coating on inner surface of hollow workpiece
  • Method for preparing Ni-SiC composite coating on inner surface of hollow workpiece
  • Method for preparing Ni-SiC composite coating on inner surface of hollow workpiece

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Embodiment Construction

[0063] The invention uses the Q235 steel revolving body as the hollow workpiece to be plated. The invention relates to a method for preparing a Ni-SiC composite coating on the inner surface of a hollow workpiece by using a circulating electroplating device, and is a co-deposition method of a circulating electroplating solution.

[0064] The present invention utilizes the device for preparing the Ni-SiC composite coating on the inner surface of the hollow workpiece proposed in the invention creation with the application number 201610810698.2 to implement plating on the inner surface of the hollow workpiece.

[0065] The device for preparing the Ni-SiC composite coating on the inner surface of the hollow workpiece includes a liquid storage tank, an electroplating solution circulation pump, a compressed air pump, an electromagnetic flowmeter, a compressed air pump and a sealed electroplating station.

[0066] The lower water outlet pipe and the upper water outlet pipe parallel to...

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Abstract

The invention provides a method for preparing a Ni-SiC composite coating on the inner surface of a hollow workpiece. By means of a cyclic electroplating solution code position technology, an electroplating solution only makes contact with the inner surface of the hollow workpiece, and only the composite coating is deposited on the inner surface of the hollow workpiece without affecting the status of the outer surface of the hollow workpiece. The SiC content of the composite coating prepared in the composite electroplating solution with the SiC concentration being 20 g/L reaches up to 18.8%vol, and the utilization rate of SiC is effectively increased. The deposition rate of the Ni-SiC composite coating reaches up to 83 microns per 30min. Compared with a pure nickel coating, the Ni-SiC composite coating is low in surface roughness, uniform and compact and has the characteristics of high hardness, high abrasion resistance and high corrosion resistance. Through the method, the problem of concentration polarization of a composite electroplating solution in an immersion type electroplating system is effectively solved.

Description

technical field [0001] The invention relates to the field of metal material surface modification technology and equipment, in particular to a method for preparing a Ni-SiC composite coating on the inner surface of a hollow workpiece. Background technique [0002] Metal matrix composite coatings have been extensively studied and successfully commercialized for automotive and aerospace applications due to their low cost, high efficiency, and good coating performance. The performance of the metal matrix composite coating is directly related to the particle content in the coating. The higher the content of particles in the metal matrix, the more uniform the distribution, and the better the mechanical properties, wear resistance, corrosion resistance and oxidation resistance of the composite coating. The particle content in the metal matrix is ​​not only related to electrodeposition parameters such as electroplating solution composition, pH value, additives, electrodeposition cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D7/04C25D5/18C25D3/12C25D5/34C25D5/50C25D5/02
CPCC25D3/12C25D5/02C25D5/18C25D5/34C25D5/50C25D7/04C25D15/00
Inventor 谢发勤周颖吴向清
Owner NORTHWESTERN POLYTECHNICAL UNIV
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