Comparison of corrosion behavior between coarse grained and nano/ultrafine grained alloy 690

Lv Jinlong, Liang Tongxiang, Wang Chen, Guo Ting

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effect of grain refinement on corrosion resistance of alloy 690 was investigated. The electron work function value of coarse grained alloy 690 was higher than that of nano/ultrafine grained one. The grain refinement reduced the electron work function of alloy 690. The passive films formed on coarse grained and nano/ultrafine grained alloy 690 in borate buffer solution were studied by potentiodynamic curves and electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. The results showed that the grain refinement improved corrosion resistance of alloy 690. This was attributed to the fact that grain refinement promoted the enrichment of Cr 2 O 3 and inhibited Cr(OH) 3 in the passive film. More Cr 2 O 3 in passive film could significantly improve the corrosion resistance of the nano/ultrafine grained alloy 690.

Original languageEnglish
Pages (from-to)403-408
Number of pages6
JournalApplied Surface Science
Volume360
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Alloy 690
  • EIS
  • Passive films
  • X-ray photoelectron spectroscopy
  • XRD

ASJC Scopus subject areas

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

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