ANODIZING

WHAT IS ANODIZING?

Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish. Aluminum is ideally suited to anodizing, although other nonferrous metals, such as magnesium and titanium, also can be anodized.

The anodic oxide structure originates from the aluminum substrate and is composed entirely of aluminum oxide. This aluminum oxide is not applied to the surface like paint or plating, but is fully integrated with the underlying aluminum substrate, so it cannot chip or peel. It has a highly ordered, porous structure that allows for secondary processes such as coloring and sealing.

Anodizing (also spelled anodising, particularly in the UK, India and Australia) is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts.

Anodizing is accomplished by immersing the aluminum into an acid electrolyte bath and passing an electric current through the medium. A cathode is mounted to the inside of the anodizing tank; the aluminum acts as an anode, so that oxygen ions are released from the electrolyte to combine with the aluminum atoms at the surface of the part being anodized. Anodizing is, therefore, a matter of highly controlled oxidation—the enhancement of a naturally occurring phenomenon.

ANODIZING PROCESS FLOW CHART

Kerosene Cleaning Remove of oil & grease
Degresing G & W Chemical 80gm/l
Rinse Hot Water Stationary water
Rinse Cold Water Stationary water
Chemical Etching G & W Chemical 500ml
Rinse Stationary water
Rinse Running water
Chemical Dip G & W Chemical 20%
Rinse Stationary water
Anodizing Anodizing bath
Rinse Stationary water
Dyeing Black/Red/Blue/Green/Orange/Rosered/Blood/Grey/Gold/Purple
Rinse Stationary water
Top Coat Sealing
Rinse Stationary water
Curing Open air
Inspection Ok to Despatch