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Metallurgical and Materials Transactions A

, Volume 49, Issue 9, pp 4362–4372 | Cite as

Revisit the Type II Corrosion Mechanism

  • Wei-Jun Zhang
  • Reza Sharghi-Moshtaghin
Topical Collection: Superalloys and Their Applications
  • 162 Downloads
Part of the following topical collections:
  1. Third European Symposium on Superalloys and their Applications

Abstract

Since it was first proposed in the early 1980s, Type II hot corrosion has been widely cited in the literature as a process of molten sulfate attack on high-temperature alloy components. In the current study, typical Type II corrosion pits observed on field components were characterized using high-resolution TEM technique. The corrosion products in the pits were found to be mainly of nanosized sulfides and oxides, but not of the hypothesized sulfates. The results suggest a solid-phase corrosion process involving the cooperative precipitation of fine sulfides and oxides at the corrosion front.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  1. 1.GE AviationCincinnatiUSA
  2. 2.GE Global Research CenterNiskayunaUSA

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