Also known as chem film or chemfilm, Alodine^® is a chromate conversion coating that protects aluminum and other metals from corrosion. ... In chemical conversion coatings, the metal undergoes a chemical reaction at the surface. This chemical reaction transforms the metal surface into a protective layer.

What is the function of alodine?

Chem film or Alodine is a chemical conversion coating that's mostly used to protect aluminum from corrosion. It's primarily used to passivate aluminum as it protects this metal and serves as a base for paint coatings. It leaves aluminum unaffected, so it's easier to put paint over it without changing anything.

How long does alodine last?

Alodining is a process in which a metal is coated with a chemical called alodine. This coating hardens to the surface and can last for years if painted, not requiring reapplication.