Chromic Acid Anodising in Aerospace and Defence
Compared with sulphuric acid anodising, the chromic acid anodising process gives relatively soft, thin coatings, normally of two to five microns thickness. These are used mainly for electrical insulation and general protection against corrosion under mild conditions. Unsealed coatings are used as a ‘key’ for paints and adhesives. It is light grey in colour, with