Alodining Metal Finishing

Alodining (chemical conversion) is a coating method intended to provide corrosion prevention to aluminum products left unpainted, as well as to improve adhesion of painting processes. It provides good corrosion protection, even protecting when scratched: Alodined 2024 aluminum withstands salt spray 150-600 hours before forming white corrosion. Untreated 2024 corrodes in less than 24 hours. Alodining provides an excellent electrically conductive surface. This helps to provide good electrical bonding in an airframe. Paint sticks to it extremely well; in some cases, it can substitute for primer.

Alodining adds no measurable weight and does not alter the dimensions of parts (does not make holes smaller). However, the alodined surface is not as durable as anodizing or a good paint, and assembled parts cannot be alodined. (Neither can they be anodized.)

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