Tunnel fans need to work in an open environment for a long time and can be eroded by rain or other factors, leading to rust. Although a small amount of rust does not affect the operation of the fan, it may affect the dynamic balance of the fan, increase the vibration of the fan, and affect the intake efficiency.

To remove rust with phosphoric or hydrochloric acid. Phosphates are not only cheap but also good at removing rust. The tunnel fan impeller is soaked in phosphoric acid, which turns the iron oxide into iron phosphate and turns it into a black coating. It is left to rest overnight and air dried. When the surface is dry, scrape off the iron phosphate.

Remove rust with vinegar. Vinegar, while effective, is also very mild, so the fan impeller should be soaked as long as possible. After removing from the vinegar, scrape off the rust.

Remove rust with baking soda. Mix water and baking soda into a paste slightly thicker than toothpaste. After mixing, peel corrosion with friction material.

Use an electric grinder or grinder. It is recommended to grind the rusting layer from the large grinding disk to clean the rusting layer of the impeller of the tunnel fan and avoid unnecessary rusting layer with small wear and easy damage.

After rust removal by the above method, the impeller of the tunnel fan must be antirust in time, such as painting, plastic spraying or chrome plating, so as to avoid secondary rust, but multiple rust removal will make the thickness of the impeller thinner. In case of thinning, it is recommended to replace a new impeller to prevent other accidents.