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Abstract
Niobium and chromium are both well known for their corrosion resistance due to the formation of protective oxide films. Sputtering is the preferred physical vapour deposition technique to deposit refractory metals such as Nb, but owing to its high melting point high ion bombardment and/or high deposition temperatures are necessary to grow dense Nb films. Further disadvantages of Nb are its relatively low hardness values and the low oxidation resistance of Nb. The present paper discusses experiments of co-sputtering Cr and Nb using the combined cathodic arc/unbalanced magnetron technique. The corrosion resistance of the 1 μm thick coatings deposited on 304 stainless steel substrates at 250 and 420°C is investigated by potentiodynamic polarisation measurements in a 3% NaCl solution. The formation of solid solutions of Cr in Nb and of the intermetallic phase of Cr2Nb were found to increase the microhardness, as well as the oxidation resistance, of the sputtered coatings substantially in comparison with pure Nb films.
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