The raw material of the steel reinforcing bar coupler is 45# carbon structural steel. It is determines that if the steel reinforcing bar scoupler comes into contact with water, it will rust within a few minutes. However, rusted steel reinforcing bar couplers will seriously affect the quality of the project. Therefore, preventing rust in steel reinforcing bar couplers is an important process in the production of steel reinforcing bar couplers.

There are five main reasons for the rusting of steel reinforcing bar couplers:

1. Poor quality of cutting fluid

During the process in the production of steel reinforcing bar couplers, cutting fluid is used. The fluid is a water-soluble oil with certain rust removal and rust prevention functions. If the quality of the cutting fluid is poor and the concentration is low, the steel reinforcing bar sleeves should not be stored for a long time, as they are prone to rust.

2. Poor quality of packaging bags

The packaging bag for steel reinforcing couplers is a laminated woven bag. If the quality of the woven bag is poor and the seal is not tight, it can cause the reinforcing bar couplers to rust.

3. Improper transportation

During the transportation process of steel reinforcing bar couplers, if they are not handled properly and the packaging bags are damaged, they can rust if they are exposed to rain or moisture.

4. Storage environment

During the storage process of steel reinforcing bar couplers, if they are stored in a damp environment for a long time, they are also prone to rust.

5. Humid construction environment

During the construction process, if steel reinforcing bar couplers are exposed to the natural environment for a long time and encounter harsh weather conditions, they can also rust.