Corrosion resistance of stainless steels and alloys depends both on their basic chemical composition, i.e. the content of alloying elements, and on the state of surface. The decrease of resistance of stainless material surface layer can show negative effects even under quite mild corrosion conditions (atmosphere, neutral aqueous solutions etc.) - it means that surface or localized corrosion can appear. The negative change of surface quality of these materials, i.e. of corrosion resistance, can be caused by unsuitable influencing of chemical and physical state of the surface [I-41.