Powder Vs Anodizing

Question:

Do you have any data or articles comparing powder coating finishes to anodized finishes? We apply a 2-mil powder coating finish to aluminum thresholds and want to know how this will compare to an anodized finish with respect to weatherability, color retention, etc. R.P.

Answer:

Powder coatings are very good organic coatings, while anodizing is an inorganic coating. Generally, inorganic coatings are harder, more weatherable, and have better color retention than organic coatings. However, powder coatings can be applied in more colors and textures than anodizing. Think of powder coatings as “paint” and anodizing as “plating” for aluminum. Plating is a much more durable coating than paint. For proof, look at the bumper of a 70’s vintage car (plated bumper) compared to one that is made today (painted bumper), and I am sure you will notice more scratches, scuffs, and dings on the painted bumper. Same goes for anodizing over powder coating, the anodized part will perform better than the powder coated part. However, powder coating is easier to perform, more environmentally safe, and less costly than anodizing on aluminum.