Explanation

Also called bluish, it is a surface treatment process to form a dense Fe3O4 film on the surface of steel workpiece. The thickness of the compact Fe3O4 film is several microns, and the color is dark blue, black, purple or brown. Immersing it in antirust oil for sealing treatment will significantly improve the corrosion resistance of the workpiece. Widely used for parts that work in oil below 200 ℃ and require a black and blue appearance to improve corrosion resistance and produce decorative effects.

Classification