The document discusses several surface modification techniques including ion beam surface treatment, sol-gel coating technology, and laser surface alloying. It describes coatings that provide corrosion resistance through conversion coatings and compound coatings of diamond-like nanocomposites, nitrides, silicides, and carbides. Coatings for wear resistance include carbon nitride thin films, sputter deposited nanostructured ceramic coatings, and dielectric coatings of Si-C alloy films.