How does the surface treatment of a casting affect its corrosion resistance?

Castings play an important role in construction machinery, and their surface treatment is crucial to their corrosion resistance. In harsh working environments, castings may face erosion from water, air, chemicals and other corrosive media, so effective measures must be taken to protect their surfaces from damage.

A common treatment method is to apply an anti-corrosion coating. These coatings are usually made of organic or inorganic materials and can form a protective film to prevent corrosive media from directly contacting the casting surface, thereby slowing down or preventing the occurrence of corrosion. At the same time, anti-corrosion coatings provide additional wear resistance and durability.

By applying anti-rust agent to the surface of castings, a protective film can be formed to effectively resist erosion by air, water vapor and other harmful substances. Sand blasting is also one of the common surface treatment methods. By using high-pressure air to spray sand particles onto the surface of the casting, dirt, oxides and other undesirable substances can be removed, making the surface smoother and improving the corrosion resistance of the casting.

Chemical treatment is another common method that prevents corrosion from corrosive media by forming a chemical protective film on the surface of the casting. This method can not only improve the corrosion resistance of the casting, but also improve its appearance and mechanical properties.