WHO MUSTS FIRST: REVISITING GALVANIC CORROSION

摘要

Galvanic corrosion has been studied for over 200 years, but is still the subject of misunderstanding and misuse. It arises when dissimilar metals are joined in a common electrolyte. The more active metal will corrode while the more noble metal will be protected. However, there are many factors other than electrochemical potential which influence the severity of the galvanic action, including area ratio, the nature of the surface of the more noble metal and the environment. After providing a brief history, this presentation reviews investigations which have been carried out into practical aspects of galvanic corrosion. It looks at the factors that influence this form of corrosion, how they are inter-related and how galvanic behaviour can be better predicted than simply reference to a Galvanic Series.