Abstract
Stress corrosion cracking (SCC) susceptibility of the
duplex stainless steels E 1.4162 (U S S32101) and E
1.4462 (U S S32205) was evaluated with U-bend specimens
in the alkaline sulfide solution containing 100 g/l aOH
and 55 g/l a 2S. Complementary potentiodynamic
measurements were used to evaluate the effect of alloy
composition on corrosion and on passivation behavior of
the duplex stainless steels. The reference material in
the study was the austenitic stainless steel E 1.4301 (U
S S30400). Based on separate potentiodynamic curves and
the free corrosion potential measurements of the alloys
during the SCC tests, it is evident that Cr and i as the
main alloying elements in duplex stainless steels raised
the corrosion potential and lowered the critical current
density of the steel, thus improving SCC resistance.
Based on the potentiodynamic curves the alloying elements
Mo and Mn were highly active in the hot caustic solution.
SCC in the austenitic reference stainless steel was
severe penetrating in the unaffected material but in the
duplex stainless steels cracking was observed only inside
the affected surface layer. Selective dissolution of Fe,
Cr, Mn and Mo and/or enrichment of i and Cr as well as a,
S and O took place in the affected surface layers of the
duplex stainless steels depending on the steel grade
| Original language | English |
|---|---|
| Title of host publication | Corrosion conference and expo 2012 |
| Pages | 5780-5800 |
| Volume | 7 |
| Publication status | Published - 2012 |
| MoE publication type | A4 Article in a conference publication |
| Event | Corrosion conference and expo 2012: NACE International corrosion 2012 conference and expo - Salt Lake City, United States Duration: 11 Mar 2012 → 15 Mar 2012 |
Publication series
| Series | NACE - International Corrosion Conference Series |
|---|---|
| ISSN | 0361-4409 |
Conference
| Conference | Corrosion conference and expo 2012 |
|---|---|
| Abbreviated title | CORROSION2012 |
| Country | United States |
| City | Salt Lake City |
| Period | 11/03/12 → 15/03/12 |
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Cite this
Leinonen, H., Pohjanne, P., Chasse, K. R., Singh, P. M., Romu, J., Saukkonen, T., & Hänninen, H. (2012). Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution. In Corrosion conference and expo 2012 (Vol. 7, pp. 5780-5800). NACE - International Corrosion Conference Series