Type I Anodize:

Boric Anodize – Boric-Sulfuric Acid Anodize (BSAA) is an alternative to chromic acid anodize (CAA), that builds a thin-film anodic coating and provides corrosion protection and a mechanical bond. This is a chromated, environmentally friendly solution.

Tartaric Anodize – Tartaric-Sulfuric Anodize (TSA) is an alternative to chromic acid anodize (CAA), that builds a thin-film anodic coating and provides corrosion protection and a mechanical bond. This is a chromated, environmentally friendly solution – typically specified in Airbus programs like the A350.

Chromic Anodize – Chromic Acid Anodize (CAA) creates the thinnest anodic coating, while providing the same corrosion resistance as other types of anodization, such as boric or sulfuric.

Type II Anodize:

Sulfuric Anodize – Sulfuric Acid Anodize (SAA) is used when hardness and abrasion resistance is required on a part, and creates a surface that is harder than traditional chromic anodizing.

Type III Anodize:

Hardcoat Anodize – Hardcoat anodize is created as a sulfuric acid bath, but results in a much thicker surface anode coating than traditional sulfuric acid anodizing.

Phosphoric Acid Anodize (PAA) is most commonly used in bonding applications, as it provides a superior porous surface for bonding to composites.

Chemical film or chem-film is also known as conversion coating.

Passivation is the process of creating an outer shield material for a part that helps inhibit future corrosion.

Aluminum etch is a process by which a thin layer of the surface is removed, prior to penetrant inspection, typically in caustic or alkaline baths or solutions. This enhances the identification of surface defects, prior to further processing.

Titanium is often etched prior to penetrant inspection using a variety of different acids, commonly hydrofluoric and or nitric acid.

Zinc Phosphate is a conversion coating for steel and aluminum, comprised of phosphate salts and phosphoric acid.