Coatings and Sealants

Metallic, inorganic and organic coatings are used frequently for providing long-term corrosion protection of metals in various types of corrosive media. There are two main types of coatings: barrier coatings and sacrificial coatings. A barrier coating acts as a shield and protects the metal from the surrounding environment, whereas a sacrificial coating functions as a sacrificial anode and thus, corrodes preferentially. Barrier coatings are typically unreactive, resistant to corrosion, and protective against wear. Sacrificial coatings provide cathodic protection by supplying electrons to the base metal. Sealants provide corrosion protection by completely securing the component from moisture penetration.