Abrasive Roughness Profile
The surface profile created by the impact of abrasive. Characterized by the roughness depth. Influences the adhesion of subsequent coatings.
Physical-Chemical Mechanism of Action
When the blasting media impacts the material surface, microscopic cracks and deformations occur. These create a rough surface profile with a specific roughness depth.
Metallurgical Relevance & Welding Risks
A too low blasting media roughness profile can cause subsequent coatings to adhere poorly and fall off. A too high roughness profile increases stresses in the material surface and can lead to damage or corrosion.
Workshop Practice & Instructions
The roughness depth should be between 5 and 20 µm, depending on the chosen coating material. Check the roughness depth with a microscope or a special measuring device after blasting. Adjust the blasting power and impact speed accordingly.