Liquid nitriding, liquid oxygen-nitriding, QPQ, and OPO surface treatment technologies are metal salt bath surface strengthening and modification techniques. Through more than twenty years of scientific research and practice, these two technologies have been widely applied 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, among dozens of sectors.

Liquid Nitriding: It involves diffusing nitrogen, carbon, sulfur, and other elements into the metal surface, significantly enhancing the hardness of the metal, resulting in a uniform diffusion layer. Mechanical parts possess excellent wear resistance and fatigue strength. It also boasts advantages such as minimal deformation, non-toxicity, and energy-saving. Liquid Oxygen Nitriding: This process is an oxidation step performed on the basis of liquid nitriding, which increases the surface hardness and wear resistance of the metal. It also greatly improves the surface corrosion resistance, with a glossy black surface. The neutral salt spray test can last from 96 to 960 hours.