An oxide film or an oxide film is a film on the surface of a metal or semiconductor that forms under certain conditions in air or a slightly oxidizing environment and consists of oxides of this substance. The thickness of oxide films can vary from several diameters of molecules to several tens of millimeters.
Types of Oxide Films
Film on a razor heated from one end
- Dross - a surface oxide film consisting of partially bonded layers of corrosion products that occurs when the material is heated.
- Rust is a surface oxide film consisting of partially bonded layers of corrosion products that occurs in an oxidizing environment.
- Deckiness is a mottled, often iridescent color of a thin surface layer of a mineral or steel, which differs sharply from the color of the bulk of the material.
- Blue film - occurs on the surface of steels as a result of annealing under certain conditions (blue annealing).
Ways to get
- Oxidation - the process of oxidizing the surface of solid metals and semiconductor materials by chemical, electrochemical ( anodizing ) or otherwise.
- Blue annealing - heating a steel sheet in an open furnace to a certain transformation temperature, after which the sheet is cooled in air. After blue annealing, a decrease in the hardness of steels is observed, and a bluish oxide film appears on their surface.
The resulting oxide films often play a protective role ( passivation ) for the bulk of the metal or semiconductor on which they are formed.
Literature
- Metals and alloys. Reference / ed. Yu.P. Solntseva. - SPb. : NPO Professional, NPO Peace and Family, 2003.
- Great Soviet Encyclopedia. - M .: Soviet Encyclopedia, 1969-1978.