Ni-Co-X chromium-substituting electric brush plating solution

Abstract

The invention discloses a Ni-Co-X chromium-substituting electric brush plating solution. Each liter of the plating solution comprises 260-300 g of nickel sulfate, 100-110 g of cobalt sulfate, 15-20 ml of formic acid, 45-55 g of acetic acid, 10-20 g of hydrochloric acid, 40-60 g of boric acid, and aluminum oxide nano-particles or sodium hypophosphite which is used to improve the corrosion resistance and the wear resistance of the plating solution. The plating solution is free from highly toxic hexavalent chromium ions; the generated sewage is easy to treat, so that the plating solution is environment-friendly; the quality of the plated layer is stable; the deposition velocity is quick; the crystal of the plated layer is meticulous; the degree of finish is high; the adhesion between the plated layer and a matrix is strong; the comprehensive performance of the plated layer is high; in addition, the wear resistance and the corrosion resistance of the plated layer are better than that of the hard chromium plated layer.

Description

technical field [0001] The invention relates to the technical field of electric brush plating, in particular to a plating solution applied to the remanufacturing of chrome-plated damaged parts by electric brush plating. Background technique [0002] Hard chrome plating is also called wear-resistant chrome. The chrome plating layer has the characteristics of high hardness and low friction coefficient. After hard chrome plating of mechanical parts can improve their wear resistance and prolong service life. There are a large number of hard chrome-plated parts in military equipment, such as gun barrels for artillery, hydraulic cylinders and piston rods in construction machinery, etc. [0003] In the process of use, due to the force, the chrome-plated parts will gradually be damaged. The damage is mainly in the form of local wear, scratches and coating shedding. For damaged chrome-plated parts, all the chrome-plated layers should be ground off first, and then repaired by re-chr...

AI Technical Summary

Problems solved by technology

[0005] Second, it causes waste of chrome plating on undamaged parts

If the method of re-chrome plating is used for repair, most of the intact chrome plating will be worn away, which will inevitably cause huge waste

[0006] Third, the pollution of chrome plating technology is serious

Amorphous coatings generally require heat treatment before use, which increases the process, and heat treatment affects the performance of the substrate, and it is difficult to heat treat large parts with local brush plating

At the same time, there is a high thermal stress after the heat treatment of the coating, and deep brittle cracks are prone to occur during the wear process, and the corrosion resistance of the coating after heat treatment also decreases, which significantly limits its application to replace hard chrome in high wear and corrosion resistance occasions.

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