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Electrochemical Behavior of the Austenitic Stainless Steel Susceptibility to Sulfide Stress Cracking in H2S Containing Brines

Picture for Electrochemical Behavior of the Austenitic Stainless Steel Susceptibility to Sulfide Stress Cracking in H2S Containing Brines
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Austenitic stainless steels are widely in use in oil & gas production environments providing effective protection for mitigation of general corrosion due to the presence of CO2 in the produced fluids. However there is little agreement on the service limits when exposed in environments that contain H2S particularly in relation to the susceptibility to chloride stress corrosion cracking (SCC) assisted by H2S.This paper presents the results obtained from the evaluation of the electrochemical behavior using a combination of direct and alternate current methods of the passive layer formed by 316L stainless steel in the presence of brines of different ionic strength in equilibrium with a gas phase at 400 psi containing up to 60% mol of H2S (bal. CO2). The objective of the study is to evaluate the effects of temperature H2S and Cl- concentration on the pitting onset and the likelihood of SCC.The results obtained indicate that the decrease of the pitting potential is consistent with the passive layer formed on the 316L stainless steel increasing the electron donor carrier density at constant temperature. In this context the Cl- content in the brine exerts a larger effect than the H2S activity. The solution temperature was found to push the pitting and open circuit potential in more active direction due to the increase of kinetics effects independently of the H2S activity.The increase in the susceptibility to SCC was found to be proportional to the H2S content in the brine at constant temperature and chloride level; however the threshold H2S content to induce SCC is shown to increase with the brine ionic strength. This behavior is consistent with the observed reduced SCC susceptibility at higher chlorides and the presence of metastable pitting which is intensified by the activity of H2S .

Product Number: 51319-12854-SG
Author: Raymundo Case
Publication Date: 2019
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