Effect of Sn for ferritic stainless steels on corrosion resistance in sulfuric acid solutions

Nobuhiko Hiraide, Hiroyuki Matsuyama, Toru Matsuhashi, Haruhiko Kajimura, Nobuyoshi Hara

Research output: Contribution to journalArticlepeer-review

Abstract

Immersion tests, polarization curve measurement, and electrochemical impedance measurement were conducted in order to investigate the effect of Sn alloying on the corrosion resistance of ferritic stainless steels in sulfuric acid solutions. The addition of Sn to 14Cr ferritic stainless steels and the addition of Sn2+ ions in the solutions were effective in decreasing the corrosion rate in sulfuric acid solutions. Sn was an effective alloying element for suppressing the anodic dissolution near the corrosion potential and Sn2+ acted as effective ions for inhibiting both anodic and cathodic reactions in sulfuric acid solutions. The addition of Sn to 14Cr ferritic stainless steels was quite effective in decreasing the anodic current densities in the acidic sodium sulfate solutions of pH 0.5-2 and in the potential range where Sn2+ ions are thermodynamically stable. It was thought that Sn in the ferritic stainless steels dissolved as Sn2+ ions in sulfuric acid solutions and the active dissolution was suppressed by the surface adsorption of Sn chemical species originated from the dissolved Sn2+ ions.

Original languageEnglish
Pages (from-to)361-368
Number of pages8
JournalZairyo to Kankyo/ Corrosion Engineering
Volume66
Issue number11
DOIs
Publication statusPublished - 2017

Keywords

  • Active dissolution
  • Ferritic stainless steels
  • Sn
  • Sn ion
  • Sulfuric acid

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrochemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Effect of Sn for ferritic stainless steels on corrosion resistance in sulfuric acid solutions'. Together they form a unique fingerprint.

Cite this