What are the advantages and disadvantages of chrome plating?
Advantages of chrome plating
1. High hardness of chromium plating layer. The hardness of the chromium plating layer is HB800~1000, which is 30% higher than carburized steel and nitrided steel, and 3.6 times higher than ordinary cast iron.
2. High wear resistance of chromium plating layer. Since the chromium plating layer has high hardness and low friction coefficient, the wear resistance is increased by 5 to 10 times.
3. The chromium plating layer has strong corrosion resistance. The chromium plating layer does not interact with organic acids, sulfur, sulfides, sulfuric acid, nitric acid, carbonates, or alkalis.
4. The chromium plating layer has a strong bonding force with the base metal. When operated well, the bonding strength between the coating and the steel can be greater than the bonding strength of the steel itself.
5. The chromium plating layer has good heat resistance and thermal conductivity. The chromium plating layer can work at high temperatures. When the temperature reaches above 500 degrees Celsius, the coating begins to change color and the mechanical properties change. The thermal conductivity of chromium is second only to copper and 40% higher than pig iron. Experiments have proved that plating chromium on the cylinder wall can improve working conditions.
6. The chromium plating layer has no thermal effect on the base metal.
7. The chrome plating layer has a beautiful appearance and is not easy to change color.
These properties of the chromium plating layer provide good conditions for increasing the service life of parts. The service life of chromium-plated piston rings is increased by 2 to 3 times.
The main disadvantages of chrome plating
1. The deposition efficiency of the chromium plating layer is low, resulting in low productivity. However, our country's working class and technical personnel have created many technological measures to improve productivity in production practice.
2. The lubrication performance of the chromium plating layer is poor. When working under poor lubrication conditions, the wear resistance is reduced. If porous chromium plating is used, the wear resistance can be increased by 2 to 4 times.
3. If the chromium layer is not properly controlled, it is prone to cracks and peeling.
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