Abstract
The behavior of A718 and AD730™ was studied in air + SO2 gases with Na2SO4 deposit at 650 °C and 700 °C. The A718 alloy underwent pitting, whereas AD730™ was uniformly degraded. For a given alloy, the corrosion rate and morphology were similar at both temperatures but depended on the SO3 pressure. The sequence of oxides in the corrosion products demonstrates the presence of an aO2− gradient across the corrosion products. This indicates that the reductive and oxidative reactions were localized at the salt-gas and alloy-salt interfaces, respectively, questioning the need for diffusion of O2 and SO3 into the melt.
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