Blackening process of high-strength nuts

Blackening process of high-strength nuts

High strength nuts usually need to work in harsh environments. In order to make high-strength nuts work longer, it is necessary to provide a layer of protection for high-strength nuts.

There are several protection methods, usually achieved by blackening. Today, let's talk about the process of blackening high-strength nuts.

In fact, the blackening process is a blackening process at room temperature, which can be divided into the following processes. Firstly, the surface rust of the high-strength nut is washed away.

Afterwards, the degreasing process begins, and the high-strength nut workpiece must be completely immersed in the degreasing solution; The pH value of the degreasing solution concentration is between 12 and 14, and the soaking time for degreasing is generally 10 to 30 minutes.

During the degreasing process, it is necessary to vibrate up and down every three to five minutes, and then repeat several times to proceed to the next step. Here, it should be noted that if the concentration of the liquid is below the pH value of 12, it is necessary to supplement the degreasing powder. The next step is to perform a simple water washing process. After cleaning the chemical surface, acid washing must begin.

Pickling requires a pickling solution with a pH value between 2 and 4. The pickling process takes five to ten minutes to complete. Afterwards, clean the chemicals thoroughly.

After all these processes are completed, the high-strength nuts begin to turn black. In the black pool, pour chemical reagents with pH values of 2.5 to 3.5 to soak high-strength nuts. Soaking nuts and then cleaning takes ten to twelve minutes. Finally, the blackening process can be completed b