Abstract
T91 steel specimens were tested at a high temperature with and without Na2SO4-NaCl molten salt under different stresses to investigate the effect of imposed stress on the corrosion behaviour. The imposed tensile stress facilitated chromium-oxide growth near the substrate and strengthened the corrosion resistance. The mechanism of the stress-salt-gas coupling effect on the high temperature corrosion of alloy T91 was discussed. The “optimal stress” of 20 MPa provided T91 with the best corrosion resistance.
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