Galvanic Corrosion (Bi-Metallic Corrosion)

Galvanic corrosion (bi-metallic corrosion) is the corrosion that occurs when dissimilar metals are in contact in the presence of an electrolyte. Dissimilar metals and alloys have different electrode potentials, and when two or more come into contact with an electrolyte, one metal acts as anode and the other as cathode. The electrolyte acts as a path for ion migration between the two metals, and the electropotential difference between the dissimilar metals causes the anode metal to dissolve in to the electrolyte, and deposits collect on the cathode metal. CMP advises the cable cleat and support structure combinations shown in the following tables.

Cable Cleat Fixings / Support Structure Galvanic Corrosion Table

Generic Corrosion Data Table

Cable Cleat / Support Structure Galvanic Corrosion Table

Cable Cleat Fixings / Support Structure Galvanic Corrosion Table