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Galvanic corrosion

Galvanic corrosion in carbon composites

Galvanic corrosion is a type of corrosion that appears when two metals with a potential difference are electrically connected and a electrolyte bridge like water is present. An unbalanced oxydation reaction will take place at the surface where one of the metals will be affected.

This can also happen when using carbon composites because carbon, a conductive material, also introduces a potential difference once connected to metals like Aluminum and Steel. For example, when carbon panels are connected with metal fixtures, measures should be taken to prevent galvanic corrosion of the metal.

Finishmat® applied at the outside surface of a carbon product, is a very effective solution to prevent galvanic corrosion. The polymeric nonwoven layer helps to create a defect free and closed resin layer which prevents the carbon fibers to make electrical contact with metals.