Abstract
The potentiodynamic technique has been used to study the pitting corrosion of a 6Mo steel, 254 SMO ®, in 1 M NaCl solution. The experiments were interrupted at a very low current after the breakdown potential was reached, when the pits formed were still very small. These pits were studied by scanning electron microscopy and the pit walls were analysed by energy-dispersive X-ray spectroscopy. At an early stage of pit propagation the pit walls are covered with a porous layer of corrosion products which contain high amounts of chromium, molybdenum and oxygen. It is assumed that molybdenum is present as a complex unsaturated Mo(V,VI) oxide. Chromium may be a constituent of this oxide or a separate chromium oxide phase. The metal under the porous oxide layer is depleted in molybdenum.
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