Intergranular Corrosion (IGC)

Intergranular corrosion, also known as intercrystalline corrosion or grain boundary corrosion, is a form of corrosion in which attacks spread along the grain boundaries of metals. It occurs particularly in stainless steels when chromium carbides precipitate at the grain boundaries due to certain heat treatments or welding processes. This reduces the chromium content in adjacent areas, weakening the passive layer and making the material locally susceptible to corrosion.

Consequences can include cracking, pitting, or complete failure of the component. Preventive measures include using low-carbon stainless steels, stabilizing alloys with elements such as titanium or niobium, and applying controlled heat treatments.

GKD uses corrosion-resistant alloys in the production of its metal meshes and advises customers on selecting suitable materials for their applications. When choosing fasteners and frame materials for filter elements, we ensure that corrosion at weld seams is minimized to increase durability.