Type II hot corrosion of A718 and AD 730™ polycrystalline Ni-based alloys: Influence of the SO3 partial pressure
Source abstract
Abstract
The behavior of A718 and AD730TM was studied in air + SO2 gases with Na2SO4 deposit at 650 °C and 700 °C. The A718 alloy underwent pitting, whereas AD730TM 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 a_(O^(2-) ) 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Metallurgical Processes and Thermodynamics · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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