What are the factors that affect the surface roughness of the coating after chromium plating?

What are the factors that affect the surface roughness of the coating after chromium plating?

Wed Apr 24 08:28:28 CST 2024

In the electroplating industry, chromium plating is a common surface treatment method, which not only provides a decorative bright appearance, but also gives the workpiece good hardness, corrosion resistance and wear resistance. However, the surface roughness of the plating is an important index to measure the quality of the plating, which will directly affect the performance and appearance of the plating. The following are several key factors that affect the surface roughness after chromium plating:

1. The surface state of the original substrate: the surface treatment of the workpiece before plating is one of the important factors affecting the quality of the coating. Any scratches, pits, or oxidized film can show up on the plating, so proper sanding, polishing, and cleaning before chrome plating is essential.

2. Composition and conditions of the plating solution: chromic acid, sulfuric acid, chromium plating additives concentration, proportion and pH value will have an important impact on the brightness and roughness of the coating. In addition, impurities and pollutants in the plating solution can also cause defects on the coating surface.

3. Electroplating process control: current density, temperature, stirring state and other electroplating parameters have a great impact on the coating. Improper current density may lead to rough, loose, or even ablation of the coating, while improper temperature or uneven agitation may lead to uneven coating and rough surface.

4. Plating time: the thickness of the coating is affected by the plating time, and too short time may lead to too thin coating and uneven surface; If the time is too long, the coating may be too thick, resulting in cracks and increased roughness.

5. Post-treatment process: post-treatment steps such as cooling, cleaning and drying after electroplating also affect surface roughness. Non-standard operation may leave water stains or other marks that affect the smoothness of the coating surface.

Considering the above factors, it is necessary to control the whole plating process to improve the surface roughness after chromium plating. The surface quality of chrome plating parts can be obviously improved by optimizing the surface pretreatment of the original substrate, strictly controlling the formula and process parameters of the plating solution, using Bigely chrome plating additives and proper post-treatment. The electroplating technician must understand how various factors interact and constantly adjust the process to ensure that the electroplating product meets or exceeds the required quality standards.

If you need chrome plating additives, please feel free to contact us.