Technical Information

What is anodizing and why use it?

Aluminum anodizing retards corrosion, yields a hard durable surface, and beautifies the aluminum through different surface effects including coloring, sanding, and etching. The actual process includes cleaning, deoxidizing, anodizing with dc voltage, then sealing in most cases. A very hard surface that is scratch resistant is the result.


Can parts be re-anodized?

The short answer is yes assuming the prior surface can be stripped and reconditioned to its original surface. Sometimes, it is just not feasible based on cost to reanodize.


Can an anodized surface be painted?

Absolutely ! An anodized surface gives a great base for painting.


Can the aluminum be buffed after anodizing?

Sorry. The aluminum after anodizing is a very hard surface that would be very difficult to buff or polished after the fact. If you want a high gloss surface, it must be buffed prior to anodizing.


Just how hard is an anodized surface?

Let's answer this by saying that aluminum can be so hard that you can neither scratch it, saw it, or machine it. If the surface is hard anodized properly, it may be as hard as Rockwell 70 ( and that is REALLY hard...approaching tool steel)


How much thickness will anodizing add to a surface?

Conventional anodizing will add approximately .0002-.0005 inches to every surface and hard anodizing can add as much as .002 to all surfaces. Actually, the anodic thickness is double that but 40-60% of the total thickness is embedded into the substrate.


Is an anodized surface conductive or non-conductive?

We are asked that question all the time and the answer is NON CONDUCTIVE. So, if you are going to use an aluminum plate in a electrical circuit, keep that in mind.


What process can I use to yield a conductive surface yet be protected from corrosion?

Chemfilm is a process that does exactly that. It protects the surface from corrosion and actually increases conductivty.


Will scratches show after anodizing?

Anodizing will not hide scratches. A severe etching can hide some surface bemishes, but not deep scratches. If you can feel the scratch with your fingernail, it will still be there after etching and anodizing.