Galvanic compatibility refers to the ability of different materials to come into contact without causing galvanic corrosion.
When metals of different “nobility” are used together, they can cause damage due to corrosion.
For instance, when zinc-plated steel and stainless steel are in contact in humid or marine environments, water serves as an electrolyte, accelerating the galvanic corrosion process. In this case, stainless steel, being a more noble material compared to zinc-plated steel, induces galvanic corrosion in the latter. The stainless steel acts as the cathode, while the zinc-plated steel acts as the anode, thereby undergoing the corrosive damage.
For this reason, it is crucial to consider the galvanic compatibility of various materials, particularly in marine environments.
An effective solution to prevent corrosion involves interposing a dielectric material, such as rubber or Teflon, between incompatible metals, thereby interrupting the electrical continuity and preventing the occurrence of galvanic corrosion.
However, this solution can be complex, making it preferable to use materials that are inherently compatible with one another.
If the components to be connected are made of stainless steel, the fasteners should also be of stainless steel to ensure compatibility.