* Conversion coating
** Autophoretic, the registered trade name of a proprietary series of auto-depositing coatings specifically for ferrous metal substrates
** Anodising
** Chromate conversion coating
** Plasma electrolytic oxidation
** Phosphate (coating)
* Ion beam mixing
* Pickled and oiled, a type of plate steel coating
* Plating
** Electroless plating
** nickel plating coating using a different material to preserve mechanical properties
** Electroplating