Electro-chemical voltage tension is a so-called physical constant. Therefore it is quite astonishing how often non-compatible metal pairs are used in technical applications. The more noble material "behaves as a kind of victim" towards the less noble material. Owing to this phenomenon even ferrite-free metals (e.g. stainless steel) may corrode. In combination with liquids (electrolyte) this effect can also occur over longer distances. Crevice corrosion is a form of damage intensified by electro-chemical behavior.
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