TY - GEN
T1 - Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels
AU - Husby, Hans
AU - Barnoush, Afrooz
AU - Lannuzzi, Mariano
AU - Johnsen, Roy
N1 - Publisher Copyright:
© 2016 Curran Associates Inc.. All rights reserved.
PY - 2016
Y1 - 2016
N2 - The use of low alloy steels (LAS) in H2S-containing environments in the oil and gas industry is governed by the ISO standard 15156-2 (NACE MRO175-2). One requirement, which has been disputed over the years, is that the nickel (Ni) content shall not exceed 1 wt%. This work investigated the effect of Ni in solid solution on hydrogen diffusion, solubility, and trapping in ferritic/pearlitic research-grade LAS with nominal Ni contents from 0 to 3 wt%. Hydrogen permeability experiments were carried out in a Devanathan-Stachurski setup at 15, 45 and 70 °C. The effective diffusion coefficients, calculated by the tlag method, decreased with increasing Ni content. The sub-surface hydrogen concentration in lattice and trap sites increased with increasing Ni content. There was no difference between the first and subsequent hydrogen permeation transients, suggesting that Ni in solid solution forms reversible traps. The effect ofNi in refining the microstructurc may be superimposed on the effect of Ni in solid solution, and should be investigated in future work.
AB - The use of low alloy steels (LAS) in H2S-containing environments in the oil and gas industry is governed by the ISO standard 15156-2 (NACE MRO175-2). One requirement, which has been disputed over the years, is that the nickel (Ni) content shall not exceed 1 wt%. This work investigated the effect of Ni in solid solution on hydrogen diffusion, solubility, and trapping in ferritic/pearlitic research-grade LAS with nominal Ni contents from 0 to 3 wt%. Hydrogen permeability experiments were carried out in a Devanathan-Stachurski setup at 15, 45 and 70 °C. The effective diffusion coefficients, calculated by the tlag method, decreased with increasing Ni content. The sub-surface hydrogen concentration in lattice and trap sites increased with increasing Ni content. There was no difference between the first and subsequent hydrogen permeation transients, suggesting that Ni in solid solution forms reversible traps. The effect ofNi in refining the microstructurc may be superimposed on the effect of Ni in solid solution, and should be investigated in future work.
KW - Hydrogen
KW - Low alloy steel
KW - Nickel
KW - Permeability, oil & gas
UR - http://www.scopus.com/inward/record.url?scp=85065994225&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85065994225
T3 - European Corrosion Congress, EUROCORR 2016
SP - 69
EP - 88
BT - European Corrosion Congress, EUROCORR 2016
PB - Cefracor
T2 - European Corrosion Congress, EUROCORR 2016
Y2 - 11 September 2016 through 15 September 2016
ER -