Corrosion resistance of Hastelloys in molten metal-chloride heat-transfer fluids for concentrating solar power applications

K. Vignarooban, P. Pugazhendhi, C. Tucker, D. Gervasio, A. M. Kannan

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

Corrosion rates have been estimated for commercial Hastelloys C-276, C-22 and N types in eutectic molten salts containing NaCl, KCl and ZnCl2 using steady-state potentiodynamic method (0.2mVs-1 within ~±30mV from the open circuit voltage). Hastelloy C-276 exhibited the lowest corrosion rates of ~10 and 40μm per year in 13.4NaCl-33.7KCl-52.9ZnCl2 (mol%) salt at 250 and 500°C, respectively. The potentiodynamic method was validated by conducting traditional immersion test for corrosion rate estimation on C-276 Hastelloy in 13.4NaCl-33.7KCl-52.9ZnCl2 (mol%) at 500°C (corrosion rate ~50μm per year). Among the samples evaluated, Hastelloy N showed highest corrosion rate of 150μm per year at 500°C.

Original languageEnglish (US)
Pages (from-to)62-69
Number of pages8
JournalSolar energy
Volume103
DOIs
StatePublished - May 1 2014

Keywords

  • Corrosion rate
  • Halide eutectic molten salts
  • High temperature corrosion
  • Potentiodynamic polarization

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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