The anodizing process - page 2
AS/NZS ISO 9001:2000 Certified
HOW IS ANODIZING CARRIED OUT? Anodizing is accomplished in five carefully controlled, calibrated, quality-tested stages:
Alkaline and/or acid cleaners remove grease and surface dirt.
An appealing matt surface finish is created with hot solutions of sodium hydroxide to remove minor surface imperfections. A thin layer of aluminium is removed to create a matt or dull finish.
A near mirror finish is created with a concentrated mixture of phosphoric and nitric acids which chemically smooths the aluminium's surface.
The anodic film is built and combined with the metal by passing an electrical current through an acid electrolyte bath in which the aluminium is immersed. The coating thickness and surface characteristics are tightly controlled to meet end product specifications.
Colouring is achieved in a number of ways. Because of the intricisies it may be better to discuss the colour process by contacting us .
This process closes the pores in the anodic film, giving a surface resistant to scratching, abrasion, crazing and colour degradation.