Electroplating process for metallic surface wear-resistance coating

Abstract

The invention relates to an electroplating technology of a wear-resistant coating on a metal surface. A metal work piece after pre-electroplating treatment is placed in a prepared electroplating solution of 60 DEG C to 80 DEG C, a pH value is stably kept to range from 7.8 to 8.4, and a current density is kept at 4-9 A / dm in an electroplating process. The preparation process of the prepared electroplating solution comprises the following steps: constituents of the electroplating solution, namely 30-100g / L of nickel sulfate, 40-65g / L of sodium tungstate, 80-100g / L of ammonium citrate, 0.5-2g / L of saccharine and 0.5-2.5g / L of 1,4-butynediol are sequentially added, mixed and stirred uniformly, are diluted by water to the normal weight of a plating bath and are regulated by strong ammonia so that the pH value is from 7.8 to 8.4, and the solution is electrolyzed for at least six hours at the current density of 1-2A / dm2. The invention adopts the electroplating technology to deposite the wear-resistant coating on the metal surface, does not discharge waste water and does not pollute the environment.

Description

technical field

[0001] The invention belongs to the technical field of electroplating, in particular to an electroplating process for an anti-friction coating on a metal surface. Background technique

[0002] The metal surface is wear-resistant and anti-corrosion, and has been relying on chemical hard chromium plating and electroplating hard chromium plating for many years. The two methods have high energy consumption, serious pollution, and produce a large amount of waste water containing chromium ions. After discharge, it will cause serious pollution to rivers, especially ground water sources. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide an electroplating process for the anti-wear coating on the metal surface, the coating has higher wear resistance than the hard chrome coating, and the production process has no environmental pollution.

[0004] The electroplating process of the metal surface wear-resistant...