BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY
Chromium oxide. Molecular graphic showing the crystal structure (grey) of chromium oxide superimposed over a lattice of oxygen (red) and chromium (green) ions. Stainless steel is covered by a thin coating of chromium oxide, which protects the metal against corrosion.
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