Aluminum Oxide Blasting
Corundum blasting is an aggressive, mineral blasting process using fused aluminum oxide to achieve high roughness depths. It is primarily used to prepare thermal spray coatings or paint systems.
Physicochemical mechanism of action
Corundum blasting uses fused aluminum oxide particles fired at high velocity onto the workpiece. These particles heat up on impact and tear away surface material. This process results in high roughness depths and improves the adhesion for paints or spray coatings.
Metallurgical relevance & risks in welding
The high roughness can impair the toughness of the weld, as it leads to increased stress concentration. Additionally, the blasting process can damage or contaminate the surface, which can cause quality issues during welding. It is important to perform a careful cleaning after corundum blasting.
Workshop practice & instructions
Use corundum blasting before applying thermal spray coatings or paints. Ensure the surface is clean and free of contaminants. Adjust blasting duration and intensity according to material and application. After blasting, perform a careful cleaning to remove any damage or contamination.