Surface modification of austenitic stainless steel for corrosion resistance in high temperature supercritical-carbon dioxide environment

Sung Hwan Kim, Gokul Obulan Subramanian, Chaewon Kim, Changheui Jang, Keun Man Park

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Surface-modification was applied to austenitic stainless steel 316LN in order to improve the corrosion resistance in high temperature supercritical-carbon dioxide (S-CO2) environment. The surface-modification methods consisted of deposition of either a single Al layer or a NiAl bi-layer on the surface, followed by inter-diffusion heat treatments. The former resulted in formation of a surface layer composed of a mixture of NiAl and ferrite phases, and the latter resulted in formation of a continuous NiAl surface layer. Surface-modified 316LN showed reduced weight gains than the as-received 316LN alloy after exposure to S-CO2 at 650 °C (20 MPa) for 500 h. Pre-oxidation in helium at 900 °C before S-CO2 exposure further improved corrosion resistance by forming inner α-Al2O3 layer. On the other hand, the extent of inter-diffusion zone was less for the specimen with a continuous NiAl surface layer before and after S-CO2 exposure.

Original languageEnglish
Pages (from-to)415-425
Number of pages11
JournalSurface and Coatings Technology
Volume349
DOIs
Publication statusPublished - 15 Sep 2018

Bibliographical note

Funding Information:
This study was supported by the MOTIE / KETEP of the Republic of Korea (No. 20151520101050 ). Financial support for two of the authors is provided by the BK-Plus Program of the MSIP/NRF of the Rep. of Korea.

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Austenitic stainless steel
  • Inter-diffusion heat treatment
  • Nickel aluminide
  • Supercritical-carbon dioxide
  • Surface-modification

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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