What are the common surface treatment methods for castings?

The railway transportation system is a complex and huge system, in which cast components play a vital role. However, due to the complexity and harshness of the operating environment, these parts often require special surface treatment to ensure that they can maintain excellent performance and durability in long-term operation.

One common surface treatment is galvanizing. By forming a zinc layer on the surface of a cast component, it can effectively improve its corrosion resistance, especially in humid, rainy or snowy climates. This process provides the casting with a strong protective layer that prevents environmental factors from corroding its metal structure, thereby extending its service life.

Coatings are another widely used surface treatment method that cover many different application scenarios. These coatings can include anti-corrosion, wear-resistant coatings, etc., designed to increase the overall durability of the cast component. By forming a strong protective layer on the surface, these coatings resist the adverse effects of the external environment, ensuring components perform well in a variety of conditions.

Phosphating treatment is a method of forming a layer of phosphorus compounds on the surface of cast parts with the purpose of improving its surface hardness and wear resistance. This is particularly important for components that operate under high load, high friction conditions, increasing their resistance to external stresses by enhancing their surface hardness.

Anodizing is a common surface treatment method among aluminum alloy parts. Through this process, not only can the corrosion resistance of the cast parts be improved, but its surface hardness can also be increased, making it better able to cope with complex and harsh operating environments.

Sandblasting can remove oxide layers and impurities by spraying abrasives on the surface of cast parts, improving surface finish and adhesion. This is essential to ensure uniform adhesion of coatings or other surface treatments, thereby enhancing the overall surface quality.