Definition - What does Wet Adhesion mean?
Wet adhesion refers to the physical property of a coating whereby it has the ability to strongly affix to a substrate material in the presence of moist environmental conditions such as rain. Wet adhesion is particularly important when protecting exposed metal surfaces against corrosion because they are exposed to the atmosphere and therefore are prone to moisture contact and electrochemical reactions.
Corrosionpedia explains Wet Adhesion
The corrosive characteristics of water are interdependent on other quality factors, such as temperature, mineral content, hardness and pH. These and other properties such as ion exchange and reverse osmosis can increase the corrosiveness of water. Therefore, high levels of wet adhesion are vital to protect any given metallic surface against corrosion by preventing water from contacting the metal's surface.