Roles of Alloying Elements on the Corrosion Behavior of Sputter-deposited Amorphous

Ternary amorphous W–xCr–yZr alloys containing 9−38 at % tungsten, 15−42 at % chromium and 39−73 at % zirconium were successfully prepared by direct current (DC) magnetron sputtering technique. The corrosion rates of all the examined sputter−deposited W–xCr–yZr alloys were in the range of 1 × 10−3 mm/y or lower which are nearly one order of magnitude lower than those of the sputter−deposited tungsten, chromium and zirconium metals after immersion for 240 h in 0.5 M NaCl solution open to air at 25°C. In particular, the simultaneous additions of tungsten, chromium and zirconium to the amorphous ternary W–xCr–yZr alloys in the chromium− and zirconium−enriched W−91Cr and W−88Zr alloys, respectively, showed a synergistic effects for showing the higher corrosion resistance than those of binary WCr and W−Zr alloys in neutral NaCl solution.