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Molten Salts Induced Hot Corrosion of High Temperature Protective Coatings: Research Progress
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Affiliation:

1.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2.National Engineering Laboratory of Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China;3.Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Guangzhou 510651, China

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Fund Project:

Guangdong Special Support Program (2019BT02C629); GDAS Project of Science Technology Development (2020GDASYL-20200402005); Science Research Fund of Guangdong Province (2016A030312015); Natural Science Foundation of Guangdong Province (2021A1515010442)

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    Abstract:

    High temperature hot corrosion is one of main failure modes for the hot components. The Na2SO4 and NaCl molten salts can accelerate the hot corrosion at high temperatures and even lead to the catastrophic accidents. Thus, this research discussed the molten salts (Na2SO4 or/and NaCl) induced hot corrosion with Na2SO4 as the main corrosion reactant. The corrosion behavior and performance characteristics of two typical types of hot corrosion were introduced. Several hot corrosion models and mechanisms were introduced, as well as the reaction formulas and corrosion mechanisms of Na2SO4, NaCl, and Na2SO4+NaCl molten salts. According to the current research status, the protective coating is an optimal approach in the hot corrosion reduction. The advanced progress of the MCrAlY coatings, NiAl coatings, thermal barrier coatings, and novel coatings was summarized. In addition, the methods to further improve the corrosion resistance of coatings were investigated. Finally, the development direction of protective coatings was predicted.

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[Li Xiaoya, Zou Jianpeng, Shi Qian, Dai Mingjiang, Lin Songsheng, Tang Peng, Su Yifan. Molten Salts Induced Hot Corrosion of High Temperature Protective Coatings: Research Progress[J]. Rare Metal Materials and Engineering,2022,51(11):3989~3997.]
DOI:10.12442/j. issn.1002-185X.20211081

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History
  • Received:December 07,2021
  • Revised:January 21,2022
  • Adopted:February 09,2022
  • Online: December 07,2022
  • Published: November 30,2022