Liquid nitriding, liquid oxygen-nitriding, QPQ, and OPO surface treatment technologies are metal salt bath surface strengthening and modification techniques. After over two decades of scientific research and practical application, these technologies have been widely used in various industries, including automotive, motorcycle, locomotive, textile machinery, construction machinery, hydraulic machinery, electrical appliances, light industry machinery, chemical industry machinery, instruments and meters, cameras, gears, tools, and molds, covering dozens of sectors.

Liquid Nitriding: It involves diffusing nitrogen, carbon, sulfur, and various other elements into the metal surface, significantly enhancing the hardness of the metal. The diffusion layer is uniform, and mechanical parts possess excellent wear resistance and fatigue strength. It also offers benefits such as minimal deformation, no environmental hazards, and energy-saving. Liquid Oxygen Nitriding: It is an oxidation process conducted on the basis of liquid nitriding, resulting in a metal surface with high hardness and wear resistance while greatly improving the corrosion resistance. The surface is a lustrous black, with neutral salt spray testing up to 96-960 hours.