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Why does the sheave or puller need to be phosphate blackening ?

2024-08-06

The pulley is a hub type part, and the material is generally cast iron. The manufacturing process is generally based on casting and forging. Therefore, pulley products without surface treatment are prone to burrs on the surface and may hurt your hands. They may also develop rust after long-term use in a humid environment. rust phenomenon.

At present, the commonly used surface treatment of pulleys is phosphating and blackening. The process is oil and rust removal - water cleaning - surface conditioning - phosphating - water cleaning - chromate treatment - drying - grease or dyeing treatment:

 

After the pulley is phosphated and blackened, the pulley has a better all-black appearance. The important thing is that after the pulley is phosphated and blackened, it is not easy to rust. The service life of the pulley is greatly extended, which can effectively help customers reduce costs.

 

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