What are the surface treatment methods for steel?

The choice of these methods depends on the intended use of the steel, the required surface quality and subsequent processing requirements.

Steel surface treatment methods mainly include physical treatment and chemical treatment.

Physical treatment.
Shot blasting. High-speed shot blasting is used to impact the steel surface to remove scale and dirt, while improving the mechanical properties of the surface.

Sand blasting. The use of high-speed jets of sand or other abrasives to clean the surface of steel can remove scale, rust and other impurities.

High-pressure water jet treatment: Use high-pressure water jet to clean the steel surface, suitable for cleaning oil and impurities.

SCS technology: The steel surface is treated by a stainless steel wire brush roller on a brushing machine, which is suitable for removing iron oxide scale while maintaining the cleanliness and roughness of the steel surface.

Chemical treatment.
Pickling. Removing the iron oxide scale on the surface of steel through chemical reaction, often used before surface treatment such as galvanizing.

Phosphating treatment: Immersing the steel in a phosphate solution forms a water-insoluble crystalline phosphate conversion film to improve the corrosion resistance of the steel.

Chemical oxidation method. Aluminum or aluminum alloy is oxidized in a chemical solution to form a strong oxide film to improve corrosion resistance and wear resistance.
Electrochemical oxidation method (anodization). An oxide film is formed on the surface of aluminum and aluminum alloy in an electrolyte, which is suitable for improving corrosion resistance and obtaining decorative appearance of different colors.
The choice of these methods depends on the use of the steel, the required surface quality and subsequent processing requirements.