Aluminum Anodizing Explained
Aluminum anodizing is a controlled oxidation process that includes 5 distinct stages: cleaning to remove grease and other contaminants, pre-treatment, which comprises etching and brightening, anodising, in which the anodic film is built and combined with the metal by passing an electrical current through an acid electrolyte bath, colouring, which can be done in a variety of ways, and finally sealing, which closes the pores in the anodic film.
The coating thickness and surface characteristics are tightly controlled to meet end product specifications.