Notes on Factors Affecting Galvanic Corrosion

Sacrificial metal coatings provide cathodic

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Unformatted text preview: the influence of nonmetallic conductors as cathodes in galvanic couples. 3. Metallic Coatings. Two types of metallic coatings are used in engineering design: noble metal coatings and sacrificial metal coatings. Noble metal coatings are used as barrier coatings over a more reactive metal. Galvanic corrosion of the substrate can occur at pores, damage sites, and edges in the noble metal coating. Sacrificial metal coatings provide cathodic protection of the nobler base metal, as in the case of galvanized steel or Alclad aluminium. 4. Cathodic Protection. The galvanic coupl...
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This document was uploaded on 03/06/2014 for the course MECH 812 at Queens University.

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