Alodine 1201, a registered trademark of Henkel Surface Technologies, is a chemical treatment process for aluminum used to provide corrosion protection and as a surface preparation for paint and adhesives. Sometimes called “aluminum passivation,” it contains hexavalent chromium and is intended to provide corrosion prevention even when left unpainted. Chromate conversion is an excellent treatment method to prep aluminum prior to paint or adhesives since it greatly enhances the ability of an organic coating to form a bond with the aluminum substrate. Being a surface conversion treatment rather than a coating, it will not alter the dimensions of the part.
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