Bimetalic Corrosion occurs when two metals with different potentials are in contact with each other. This can result in premature failure, also known as Galvanic corrosion. Galvanic potential differences between Zinc and Aluminum cause bimetallic corrosion to occur when these materials are mated together. The result is pitting corrosion of the Aluminum surface. ZnCoat® is an advanced coating containing both Zinc and Aluminum. The combination of Zinc and Aluminum in ZnCoat® greatly reduces the bimetallic cell, allowing ZnCoat® fasteners to be mated to Aluminum surfaces without compromising quality.
ZnCoat® Black |
Zinc Plating / Trivalent |
240 h SST |
240 h SST |
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No pitting of the Aluminum substrate |
Medium to dense pitting of the Aluminum substrate |
Magnification of Aluminum substrate |
Magnification of Aluminum substrate |