In order to reduce production costs and improve protection performance, the bluing process came into being. Moreover, it has been applied in large quantities in the field of air conditioning compressors.

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① The process is reduced by 1/3 compared with phosphating, and the cost is reduced;

② Excellent resistance to damp heat (120°C, 100%RH, 2atm, ≥96h);

③ The production process is safe and environmentally friendly.