Dissimilar Metal Corrosion
Dissimilar metal corrosion is another way to define what is normally defined as Galvanic Corrosion or Bimetallic Corrosion.
Galvanic corrosion
or Dissimilar metal Corrosion is a localised mechanism by which metals can
be preferentially corroded.
This form of corrosion has the potential to attack
junctions of metals, or regions where one construction metal is changed to
another.
Frequently this condition arises because different metals are more
easily fabricated into certain forms; an example might be a door frame
manufactured from aluminium extrusions (aluminium extrudes extremely well into
architectural sections), but with a door handle fabricated from stainless steel
tube to exploit its higher strength and abrasion resistance.
Dissimilar metal corrosion is well known to most designers, specifiers
and fabricators, but often the only rule in force is "don't mix metals".
See also:
Galvanic Series of Metal in Seawater
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