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
CN106567118AActive Publication Date: 2017-04-19NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2017-04-19

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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