Nickel tungsten single-walled carbon nanotube composite plating solution, coating film and preparation method thereof

Abstract

The invention discloses nickel tungsten single-walled carbon nanotube composite plating solution, a coating film and a preparation method thereof. SWCNTs having excellent mechanical performance and capable of effectively dispersing are leaded into the plating solution, and are effectively deposited and dispersed in a Ni-W matrix in the electroplating process. A Ni-W-SWCNTs composite coating film is successfully prepared on a carbon steel matrix through a pulse electroplating codeposition method. Nanotubes are dispersed in the Ni-W matrix; and as the competitive relation between crystal nucleation and growth is effectively changed in the codeposition process, and the coating film structure is improved, a deposited film layer becomes more uniform and compact, the intergranular corrosion is weakened, the dispersion path of a corrosion medium is lengthened, the self-corrosion potential is increased, the local corrosion is effectively inhibited, the stability of a passivated film is improved, and the corrosion resistance of the composite coating film is improved.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a nickel-tungsten single-wall carbon nanotube composite plating solution, a coating film and a preparation method thereof. Background technique [0002] At present, the method for preparing Ni-W coating is mainly the traditional Ni-W coating electroplating process, and the main plating solution composition and process parameters are shown in Table 1: [0003] Table 1 [0004] [0005] The Ni-W coating preparation process is: sanding → ultrasonic cleaning → degreasing → ultrasonic cleaning → pickling activation → pulse plating → cleaning → post-processing → finished product. [0006] When the traditional electroplating process is used to prepare Ni-W coatings, the current efficiency is low, the hydrogen evolution is serious, and the electrochemical active sites are few, which leads to the residual internal stress of the coating formed during the deposition process, coar...

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Problems solved by technology

[0006] When the traditional electroplating process is used to prepare Ni-W coatings, the current efficiency is low, the hydrogen evolution is serious, and the electrochemical active sites are few, which leads to the residual internal stress of the coating formed during the deposition process, the crystal grains are coarse, the grain boundaries are obvious, and the coating Surface dew point and many micro-cracks and other defects

These defects will firstly induce severe localized corrosion in the practical application of Ni-W coating, which will affect the mechanical properties of the film, thereby reducing the service life of Ni-W coating.

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