Journal
CORROSION SCIENCE
Volume 148, Issue -, Pages 110-122Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.12.007
Keywords
Grain size; Tellurium; Diffusion; Grain boundaries; GH3535 alloy
Funding
- National Natural Science Foundation of China [51501216, 51671122, 51671154, 51601213]
- National key research and development program of China [2016YFB0700401, 2016YFB0700404]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA02004210]
- Talent development fund of shanghai [201650]
- Shanghai Sailing Program [16YF1414300]
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The effects of grain size on the tellurium corrosion behaviors have been investigated systematically in GH3535 alloy. After the exposure to Te vapor, the triple-layer scales, which consist of Ni3Te2, Cr3Te4, MnTe, M6C carbides and Fe-riched gamma phase, occur in both the fine-grained and coarse-grained specimens. The thicker outer layer, the more discrete inner layer, the shallower Te permeation and Cr3Te4 existence along grain boundaries can be observed in the fine-grained specimens. By comparing the Gibbs free energies and calculating the effective diffusion coefficients, the tellurization mechanism and the role of grain size were discussed.
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