powder coating vs.annodizing (2 posts)
Annodizing is an electro-chemical process that converts the surface of raw aluminum to an artificial oxide coating. The process uses an electrolyte, or acid, which conducts electricity, similar to an automobile battery. The acid, along with the electrical charge, causes and sustains the annodize process on the surface of the aluminum. Annodizing is actually a complex series of steps involving pre-cleaning, etching, deoxidizing, anodizing, dying and sealing with careful rinsing after each immersion. Color Annodizing is Immersion in organic dye solutions can achieve color finishes in annodized but unsealed parts. This is possible because the annodize coating has microscopic pores that, depending on variables already described, allow aluminum to absorb dyes through immersion. Typically, the darker the color desired, the longer the annodize time is required.