The High-Temperature Corrosion Behavior of Nb-Al Alloys in a H_2/H_2S/H_2O Gas Mixture

摘要

The corrosion behavior of pure Nb and three Nb-Al alloys containing 12.5, 25, and 75 at./100 Al was studied over the temperature range of 800-1000 deg. C in a H_2/H_2S/H_2O gas mixture. Except for the Nb-12.5 Al alloy consisting of a two-phase structure of a-Nb and Nb_3Al, other alloys studied were single-phase. The corrosion kinetics followed the parabolic rate law in all cases, regardless Of temperature and alloy composition.