ANODISING

This forms a grey film on the surface of the metal. This process gives good corrosion resistance and some increased wear and abrasion resistance but not as good as sulphuric and hard anodising. The coating provides an ideal substrate for application of paint primers and adhesives. Because chromic acid is not corrosive to aluminium, chromic anodising is the preferred anodising for assemblies and complicated parts where electrolytes may become entrapped, subsequently promoting corrosion. Unlike other types of anodising fatigue strength of the base material is not compromised. For the above reasons this coating is widely used in the aerospace industry. This very thin oxide coating does not produce good results if subsequently dyed.

Often used as a replacement for chromic anodising where a designer doesn’t want to use chromic acid. As the name suggests this thin layer of standard sulphuric anodising that produces many of the same properties as chromic anodising. It is therefore primarily used to provide corrosion resistance where fatigue strength may other wise be a compromised if a thicker coating were applied, and as a substrate for subsequent application of paint and adhesives.

At Tewkesbury (DC) Plating we offer a variety of seals to suit our customers needs including; hot water, sodium dichromate, nickel acetate and an environmentally friendly cold nickel seal. Please contact us to discuss your requirements.