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 language | English |
|---|---|
| Pages (from-to) | 361-368 |
| Number of pages | 8 |
| Journal | Zairyo to Kankyo/ Corrosion Engineering |
| Volume | 66 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 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