Supply? Blackening treatment process

Dongguan mold parts blackened black is a common means of heat treatment of metals, the principle is the metal surface oxide film, to cut off the air, to achieve the purpose of anti-rust. Can not ask for much when the appearance of blackened pieces of blackened steel surface, but also referred to as bluish. Bluing treatment is a chemical surface treatment, its main role is a dense layer of oxide film formed on the surface to prevent corrosion on the workpiece rust, improve the wear resistance of the workpiece, it is only a surface treatment, not on the internal organization have any impact, it is not a heat treatment, and hardening are fundamentally different. Blackening treating a low temperature oxidation treatment process consists of the following process steps: 1) cleaning; 2) degreasing: the workpiece must be completely immersed in the degreasing liquid; skim concentration ph value of 12-14, the processing time 10-30min, each shaking up and down several times over 3-5 minutes, add skim powder when the solution concentration is below ph12; 3) water; 4) pickling: pickling concentration ph value of 2-4, the processing time 5-10min; 5) water; 6) black: pool concentration 2.5-3.5 ph value, when dealing with 102min; 7) water; 8) dry; 9) oil. The beneficial effect of the present invention are: