Surface Modifications

Honing / Lapping

https://en.wikipedia.org/wiki/Honing_(metalworking)

https://en.wikipedia.org/wiki/Lapping

Electro Plating / Anodyzing / Galvanziation

https://en.wikipedia.org/wiki/Electroplating

https://en.wikipedia.org/wiki/Anodizing

https://en.wikipedia.org/wiki/Galvanization

Vapor Deposition

https://en.wikipedia.org/wiki/Vacuum_deposition

https://en.wikipedia.org/wiki/Chemical_vapor_deposition