Corrosion interface formation in thermally cycled stainless steel 316 with high-temperature phase change material

Yanting Yin, Raihan Rumman, Benjamin A. Chambers, Ming Liu, Rhys Jacob, Martin Belusko, Frank Bruno, David A. Lewis, Gunther G. Andersson

Research output: Contribution to journalArticlepeer-review

Abstract

The formation and mechanism that drive corrosion in stainless steel as a containment material in the presence of phase change materials is of importance in solar thermal energy storage systems. In our work, half-immersed stainless steel 316 tokens in a carbonate-based phase change material (PCM 638) have been investigated. The samples were thermally cycled in air and Nitrogen environment up to 500 times within a high-temperature range, allowing the PCM to transform between solid and liquid states repeatedly. As a consequence of thermal cycling, severe thickness loss on steel token was observed, indicating a degree of oxidation occurring, which depleted the uncorroded steel. Cross-sectional microstructural analysis was carried out to determine the elemental distribution and structural morphology along the corrosion layers. This study shows that thermal cycling of SS 316 in PCM results in active Ni and Cr migration to the surface, leading to a significant depletion of Cr from steel moving into the PCM. Cr and Fe on the surface are found to oxidise with varying degrees, with respect to the exposure time. The depletion of Cr was found to be higher in SS 316 immersed in PCM, while also increasing with exposure time.

Original languageEnglish
Article number111062
Number of pages10
JournalSolar Energy Materials and Solar Cells
Volume225
DOIs
Publication statusPublished - 15 Jun 2021

Keywords

  • Corrosion
  • Interface formation
  • Phase change material
  • Solar thermal energy storage
  • Stainless steel 316

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