Under normal circumstances, stainless steel screws are the original color. In most cases, no surface treatment is required. However, stainless steel screws will change color during use, turning red or black. Today, I will talk to you about stainless steel. Causes and solutions for discoloration.
1. The discoloration of stainless steel is generally caused by not cleaning the screws during the cleaning process after the screws are hardened. The cleaning solution remains on the surface of the stainless steel screws, so after a period of use, the cleaning solution will chemically react with it. The reaction causes discoloration on the surface of the stainless steel screw.
2. There is surface discoloration and the red rust produced by the phosphating film on the surface of the stainless steel screw after heat treatment. In order to imitate the discoloration of the screw, we will remove the phosphating film before the heat treatment. The heat of the mesh belt furnace area.
3. After the stainless steel screw is quenched, the water quenching medium remaining in the stainless steel screw will easily lead to the reduction of the rust-like performance of the stainless steel screw and the phenomenon of blackening after a period of use. We should check it from time to time during use. The data of the water quenching medium can imitate the blackening of the surface of the stainless steel screw.
4. In the process of quenching stainless steel screws, if the oil is too old, it may also cause the screw to turn black. In the process of oil quenching, the temperature should generally be lowered, generally 50 degrees is more appropriate, which can ensure the speed of oil aging. slow down.
Post time: Sep-26-2022
