Conventional anodizing is an an enhancement of the natural oxide found on aluminium and it improves the corrosion resistance of the aluminium and it also provides a slight improvement in wear resistance.
The anodized layer can be tinted in several colours however the unifromity of the layer is very important to create a unifrom and even colour. If the layer is not unifromaly developed, then uneven shades of colours will show.
The alloying elements do influence the development of the anodizing layer and the colour obtained.
All aluminiums can be anodizied except for cast aluminium. In the case of cast aluminium, treatments such as aludine should be used.
Types of Anodizing
Type I – Chromic Acid Anodizing: Provides an effective base if the part is to be painted after anodizing.
Type II – Sulphuric Acid Anodizing: This anodizing should be used when the anodizing is to recieve a colour dye after treament.
Both types of anodizing provide good corrosion resistance.
Type III – Deeper oxide build-up to give a very hard, wear and corrosion resistance surface. Available in clear, voltage dependent colours or black.
Top Coats for Anodizing
As anodizing can be a fussy process, a top coat covering all imperfection can be applied. We have a variety of top coats to improve wear resistance or release properties. Contact us for you requirements.