Preparation of YSZ coated AISI-type 316L stainless steel by the sol-gel coating method and its corrosion behavior in molten carbonate

Seung Goo Kim, Ming Zhi Hong, Sung Pil Yoon, Jonghee Han, Suk Woo Nam, Tae Hoon Lim, Seong Ahn Hong

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The effect of heat-treatment conditions on the corrosion behavior of yttria stabilized zirconia (YSZ) coated AISI-type 316L stainless steels in molten carbonate are investigated. YSZ films on stainless steel were prepared by the sol-gel method. While the sample heat-treated at 800°C for 2 hours in air has an uneven surface microstructure with macrocracks, a YSZ coated sample heat-treated in argon has an even microstructure. The polarization resistance and corrosion rate of YSZ coated sample heat-treated in air were deteriorated from 6.948 Ωcm2 and 364.7 mpy (millimeter per year) to 3.291 Ωcm2 and 769.8 mpy, respectively, by the corrosion for 100 hours due to its poor surface microstructures. At the same experimental condition, meanwhile, those corrosion parameters of YSZ coated sample heat-treated in argon were 15.43 Ωcm2 and 164.2 mpy, respectively, and those were improved to 18.83 Ωcm2 and 134.6 mpy after the corrosion for 100 hours. This is attributed to the YSZ film with well developed surface microstructures. The concentration profiles of elements and X-ray diffractograms indicate that the oxide layer of YSZ coated sample heat-treated in argon had a triple layer structure composed of outer YSZ film, in between Fe2O3 layer, and inner chromium rich layer during corrosion.

Original languageEnglish
Pages (from-to)297-306
Number of pages10
JournalJournal of Sol-Gel Science and Technology
Volume28
Issue number3
DOIs
Publication statusPublished - 2003 Nov

Keywords

  • Molten carbonate fuel cell
  • Polymeric YSZ sol
  • Potentiodynamic polarization
  • Separator corrosion
  • Sol-gel spin coating

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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