Blackened Hexagonal Bolts

The blackening process of blackened hexagonal bolts has the advantages of safety, no electricity, high efficiency, low cost, simple equipment, easy operation and strong process adaptability. The specific process is as follows: 1. Cleaning 2. Degreasing: the workpiece must be completely immersed in the degreasing solution; the concentration of the degreasing solution is 12-14, the [...]