Electroplating method for improving surface hardness of carbon fibers

The invention discloses an electroplating method for improving the surface hardness of carbon fibers. According to the technical scheme, the electroplating method is characterized by comprising the following steps that S1, the carbon fibers are subjected to surface treatment; the pH of the electroplating solution ranges from 4 to 4.5, the nickel ion concentration ranges from 40 g/L to 60 g/L, and the electroplating time ranges from 2 min to 20 min; s3, washing with three times of countercurrent pure water after nickel plating; s4, the cleaned nickel-plated carbon fibers are subjected to chromium electroplating through a chromium plating tank; s5, washing with three times of countercurrent pure water; s6, hexavalent chromium is reduced, specifically, an HT-568 reducing agent is adopted, the cylinder opening concentration is 2%-5% v/v, the temperature is normal temperature, and the time is 1-2 min; s7, cleaning, wherein three times of countercurrent pure water washing and heating water washing are adopted; and