How does shot blasting prevent corrosion on EV battery housings?

How does shot blasting prevent corrosion on EV battery housings?

Shot blasting machines play a crucial role in preventing corrosion on electric vehicle (EV) battery housings through several mechanisms:

1.Surface Cleaning and Preparation

Shot blasting effectively removes impurities, rust, and scale from the surface of battery housings, typically made from aluminum or magnesium. This process ensures a clean and uniform surface, which is essential for the application of protective coatings.

2.Enhanced Coating Adhesion

The roughened surface created by shot blasting improves the adhesion of anti-corrosion coatings, such as conversion coatings (e.g., CHEMEON eTCP) or powder coatings. These coatings form a protective barrier against corrosive elements, significantly enhancing the durability of the battery housing.

3.Stress Relief and Surface Hardening

Shot blasting can induce a compressive stress layer on the surface of metal components, which helps to relieve internal stresses and improve the material’s resistance to fatigue and corrosion. This is particularly important for thin-walled and complex designs used in EV battery housings.

4.Gentle but Effective Treatment

Modern shot blasting machines are designed to handle delicate components gently, preventing deformation or warping. This is crucial for lightweight materials like aluminum, which are commonly used in EVs to reduce weight and improve battery range.

5.Integration with Coating Technologies

Shot blasting is often integrated with advanced coating technologies to provide comprehensive corrosion protection. For example, CHEMEON eTCP is a bare metal conversion coating that forms a passivating layer on aluminum, enhancing its natural oxide layer and providing a superior base for further coatings.

6.Preventing Electrical Failures

Corrosion can lead to electrical failures by increasing resistance and causing overheating. By removing contaminants and providing a clean surface, shot blasting helps maintain the electrical integrity of the battery housing, reducing the risk of such failures.

7.Environmental Protection

Shot blasting machines are often equipped with advanced dust collection systems, ensuring that the process is environmentally friendly and compliant with strict regulations. This is particularly important for the EV industry, which emphasizes sustainability.

In summary, shot blasting machines contribute significantly to the corrosion prevention of EV battery housings by providing a clean surface, enhancing coating adhesion, and integrating with advanced protective technologies. These processes are essential for ensuring the durability, safety, and longevity of EV battery systems.