Understanding Endogalvanic Corrosion: Prevention and Mitigation Strategies

Endogalvanism is a process in which a material undergoes galvanic corrosion due to the presence of another corroding metal or alloy in intimate contact with it. The corrosive metal or alloy acts as a catalyst, accelerating the corrosion of the material. This can occur when two different metals are in contact with each other in the presence of an electrolyte, such as water or saltwater.

Endogalvanic corrosion is a significant concern in various industries, including aerospace, automotive, and construction, where materials are often exposed to harsh environments and must be protected from corrosion. It can lead to premature failure of components, equipment, and structures, and can also cause safety hazards and financial losses.

For example, aluminum alloys are susceptible to endogalvanic corrosion when they come into contact with more noble metals like zinc or magnesium. The presence of these metals can accelerate the corrosion of the aluminum, leading to weakening or failure of the structure. Similarly, stainless steel can undergo endogalvanic corrosion when it is exposed to certain types of alloys, such as nickel-based alloys.

To prevent endogalvanic corrosion, designers and engineers must carefully select materials that are compatible with each other and avoid placing them in contact with corroding metals or alloys. They may also use coatings, cathodic protection, or other corrosion-protection methods to mitigate the risk of corrosion.