Process	Surface treatment
	Surface treatment processes change the structure of the surface adding none or very little extra material. The resulting part have improved properties (e.g. hardness or corrosion resistance) or improved surface quality (e.g. brilliance). Cleaning processes removes undesired material from the part surface. Heat treatments changes the surface (or the whole part) hardness and fragility. Polishing evens out a rough surface and reduces the surface roughness. Thermal diffusion processes have the purpose to increase hardness and wear resistance of a surface without applying a coating.
Danish Name	Overfladebehandling, Diffusionsprocesser (thermal diffusion)
Category	Surface processes
Cleaning	Sandblasting
Heat treatments	Hardening Anealing & normalization
Polishing	Chemical polishing Electro-polishing Mechanical polishing
Thermal diffusion processes	Boronising Carbonising Chromising Nitriding Nitrocarburising TDP - Toyota Diffusion Process
Photo	Thomas Nissen (Computer graphics)
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