Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
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In: Materials, Vol. 12.2019, No. 23, 3811, 20.11.2019.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
AU - Mujanovic, Emir
AU - Zajec, Bojan
AU - Kosec, Tadeja
AU - Legat, Andraz
AU - Hönig, Stefan
AU - Zehethofer, Gerald
AU - Mori, Gregor
N1 - Publisher Copyright: © 2019 by the authors.
PY - 2019/11/20
Y1 - 2019/11/20
N2 - When planning oil wells with stainless steel components, two possible reasons for depassivation have to be considered-chemical depassivation caused by acidizing jobs and mechanical depassivation caused by various tools and hard particles. The study explores conditions causing chemical activation of investigated steels and circumstances under which repassivation occurs after activation. The main focus of the study is to determine, how quickly various steels can repassivate under different conditions and to find pH values where repassivation will occur after depassivation. The investigated steels were ferritic (martensitic or bainitic) in the cases of 13Cr, 13Cr6Ni2Mo, and 17Cr4Ni2Mo, austenitic in the case of 17Cr12Ni2Mo, and duplex (austenitic and ferritic) in the case of 22Cr5Ni3Mo. Potentiodynamic experiments were employed to obtain electrochemical properties of investigated steels, followed by immersion tests to find ultimate conditions, where the steels still retain their passivity. After obtaining this information, scratch tests were performed to study the repassivation kinetics. It was found that repassivation times are similar for nearly all investigated steels independent of their chemical composition and microstructure.
AB - When planning oil wells with stainless steel components, two possible reasons for depassivation have to be considered-chemical depassivation caused by acidizing jobs and mechanical depassivation caused by various tools and hard particles. The study explores conditions causing chemical activation of investigated steels and circumstances under which repassivation occurs after activation. The main focus of the study is to determine, how quickly various steels can repassivate under different conditions and to find pH values where repassivation will occur after depassivation. The investigated steels were ferritic (martensitic or bainitic) in the cases of 13Cr, 13Cr6Ni2Mo, and 17Cr4Ni2Mo, austenitic in the case of 17Cr12Ni2Mo, and duplex (austenitic and ferritic) in the case of 22Cr5Ni3Mo. Potentiodynamic experiments were employed to obtain electrochemical properties of investigated steels, followed by immersion tests to find ultimate conditions, where the steels still retain their passivity. After obtaining this information, scratch tests were performed to study the repassivation kinetics. It was found that repassivation times are similar for nearly all investigated steels independent of their chemical composition and microstructure.
UR - http://www.scopus.com/inward/record.url?scp=85075837550&partnerID=8YFLogxK
U2 - 10.3390/ma12233811
DO - 10.3390/ma12233811
M3 - Article
VL - 12.2019
JO - Materials
JF - Materials
SN - 1996-1944
IS - 23
M1 - 3811
ER -
