In this paper, the commercial BSC16 trivalent chromium hard chromium plating solution was used as the base solution, nickel sulfate or nickel sulfonic acid was added, and the chromium-nickel composite metal deposit was prepared by periodically adjusting the constant current density. The test was conducted by Hall chamber experiment, scanning electron microscope and metallographic experiment. The experimental results showed that the composite chromium-nickel metal could be produced by periodically adjusting the constant current density. The width and number of cracks in Cr-Ni composite coatings become narrower, which may improve the protective properties of CR-Ni composite coatings. In the case of mechanical bending, the interlayer fracture occurs, which may improve the tough-plastic properties of CR-Ni composite coatings.
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