← Glossary

Differential aeration cell

An aeration cell is a corrosion cell caused by different oxygen concentrations on the same metal surface. The area with less oxygen becomes the anode and corrodes.

Physical-Chemical Mechanism of Action

An aeration cell forms when different oxygen concentrations exist on various parts of a metal surface. The area with lower oxygen content acts as the anode and preferentially corrodes.

Metallurgical Relevance & Risks in Welding

Corrosion at aeration cells can lead to loss of strength, cracking, and reduced ductility. This increases the risk of fracture and shortens the metal's service life.

Workshop Practice & Action Instructions

To avoid aeration cells, align the weld so it is parallel to the airflow. Also use corrosion-protective surface treatments and ensure a uniform oxygen supply over the entire metal surface.

MetallurgieSchweißtechnik

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