Abstract
Today, requirements for super martensitic stainless steels in terms of mechanical and corrosion resistance properties increase continuously. Effects of several alloying elements such as Cr, Mo or Cu are studied to reach better material properties. But the relationship between chemical composition and failure mechanism at low pH is still unclear due to the complexity of sour environment. In this context, this study focused on laboratory stainless steel heats containing different controlled amounts of Ni and Mo. Not only simple electrochemical tests in sour medium have shown better behavior of alloys with high content of Mo, but electrochemical impedance spectroscopy and proof rings tests also confirmed these corrosion resistance improvements. Slow strain rate traction measurements have been performed in sour medium to estimate hydrogen sulfide effects on mechanical properties. To highlight hydrogen embrittlement effect on our structure, hydrogen permeation analysis is used to estimate diffusion coefficient. Besides the amount of hydrogen in samples after stress corrosion tests have been also determined with hydrogen analyzer based on thermal conductivity measurements.
| Original language | British English |
|---|---|
| Pages | 1091-1097 |
| Number of pages | 7 |
| State | Published - 2016 |
| Event | European Corrosion Congress, EUROCORR 2016 - Montpellier, France Duration: 11 Sep 2016 → 15 Sep 2016 |
Conference
| Conference | European Corrosion Congress, EUROCORR 2016 |
|---|---|
| Country/Territory | France |
| City | Montpellier |
| Period | 11/09/16 → 15/09/16 |
Keywords
- Electrochemical impedance spectroscopy
- Hydrogen permeation
- Martensitic stainless steels
- Slow strain rate traction
- Sulfide stress cracking