Edge Recession
Edge attack is the accelerated material removal at sharp edges of components during chemical or electrolytic processes. The cause is increased current density or mass transfer at geometric points.
Physicochemical Mechanism of Action
Edge attack occurs when sharp edges in chemical or electrolytic environments create high local mass transfer or increased current density. The points have a higher surface area per volume and can therefore react faster than flat surfaces.
Metallurgical Relevance & Risks in Welding
Edge attack can damage components by removing material or damaging the surface. This can lead to cracks, wear, and reduced component life. In the welding industry, edge attack can cause incomplete weld seams or corrosion at sharp edges.
Workshop Practice & Instructions
To avoid edge attack, components should be smoothed and fine-ground before treatment. In chemical processes, carefully control the concentration of chemicals to minimize mass transfer at edges. In electrolytic processes, ensure even current distribution and adjust voltage accordingly.