Characterization of mechanical surface treated 304 stainless steel by electrochemical impedance spectroscopy

Teguh Dwi Widodo, Azizul Helmi Bin Sofian, Ryouji Suzuki, Youhei Hirohata, Kazuhiko Noda

Research output: Contribution to journalArticle

Abstract

The electrochemical behaviors of 304 stainless steel before and after mechanical surface treatment were investigated by electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. Prior to EIS measurements, potentiodynamic polarization was conducted to characterize the passive potential range and localized potential behaviors. The potentiodynamic polarization results demonstrated a localized corrosion potential shift towards a more noble direction and an expanded passive potential range after the shot peening process. The EIS results showed that the surface barrier of 304 stainless steel improved after the shot peening process. In addition, field emission scanning electron microscopy (FE-SEM) observations revealed grain refinement on the 304 stainless steel surface after the shot peening process. The observed improvement in localized corrosion resistance may be attributable to grain refinement of the 304 stainless steel surface.

Original languageEnglish
Pages (from-to)2179-2184
Number of pages6
JournalScience of Advanced Materials
Volume6
Issue number10
DOIs
Publication statusPublished - 2014 Jan 1

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Keywords

  • 304 stainless steel
  • Corrosion
  • Electrochemical impedance spectroscopy
  • Mechanical surface treatment
  • Shot peening

ASJC Scopus subject areas

  • Materials Science(all)

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