TY - GEN
T1 - Sulfide Stress Corrosion study of a super martensitic stainless steel
T2 - European Corrosion Congress, EUROCORR 2015
AU - Monnot, Martin
AU - Mantel, Marc
AU - Berthome, Grégory
AU - Roche, Virginie
AU - Nogueira, Ricardo
AU - Chauveau, Eric
PY - 2015
Y1 - 2015
N2 - Due to their good corrosion resistance as well as a wide range of mechanical properties, super martensitic stainless steels are generally used in the petrochemical industry. In this context, the super martensitic stainless steel EN 1.4418 (15% Cr, 5% Ni 1%Mo), which exhibits good corrosion and mechanical properties in sour environment, could be an alternative grade to replace EN 1.4542, which presented some stress corrosion cracking problems in service. In this work, corrosion resistance and stress corrosion cracking of 1.4418 have been followed by electrochemical and phys-ical techniques to understand the failure mechanism at low pH. This study focused on laboratory stainless steel heats containing different controlled amounts of Cr, Ni, Mo and various thermal treatments have been performed in order to define carefully the contents of martensite, ferrite and residual austenite. The corrosion mechanisms will be discussed in terms of pitting corrosion potentials, sulfide stress cracking and repassivation processes. Moreover, the effect of H2S on 1.4418 corrosion properties has been correlated to the formation of metallic sulfur, which promotes hydrogen embrittlement. In order to determine the role of this metallic sulfur in the corrosion mechanism, XPS and hydrogen permeation measurements have been realized.
AB - Due to their good corrosion resistance as well as a wide range of mechanical properties, super martensitic stainless steels are generally used in the petrochemical industry. In this context, the super martensitic stainless steel EN 1.4418 (15% Cr, 5% Ni 1%Mo), which exhibits good corrosion and mechanical properties in sour environment, could be an alternative grade to replace EN 1.4542, which presented some stress corrosion cracking problems in service. In this work, corrosion resistance and stress corrosion cracking of 1.4418 have been followed by electrochemical and phys-ical techniques to understand the failure mechanism at low pH. This study focused on laboratory stainless steel heats containing different controlled amounts of Cr, Ni, Mo and various thermal treatments have been performed in order to define carefully the contents of martensite, ferrite and residual austenite. The corrosion mechanisms will be discussed in terms of pitting corrosion potentials, sulfide stress cracking and repassivation processes. Moreover, the effect of H2S on 1.4418 corrosion properties has been correlated to the formation of metallic sulfur, which promotes hydrogen embrittlement. In order to determine the role of this metallic sulfur in the corrosion mechanism, XPS and hydrogen permeation measurements have been realized.
KW - Hydrogen permeation
KW - Martensitic stainless steels
KW - Sulfide stress cracking
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=85025620612&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85025620612
T3 - European Corrosion Congress, EUROCORR 2015
SP - 1069
EP - 1078
BT - European Corrosion Congress, EUROCORR 2015
Y2 - 6 September 2015 through 10 September 2015
ER -