Dissimilar Metal Corrosion
Dissimilar metal corrosion is another way to define what is normally defined as Galvanic Corrosion or Bimetallic Corrosion.
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".