Cargando…

Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Mujanović, Emir, Zajec, Bojan, Kosec, Tadeja, Legat, Andraž, Hönig, Stefan, Zehethofer, Gerald, Mori, Gregor
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926990/
https://www.ncbi.nlm.nih.gov/pubmed/31756966
http://dx.doi.org/10.3390/ma12233811
_version_ 1783482221650247680
author Mujanović, Emir
Zajec, Bojan
Kosec, Tadeja
Legat, Andraž
Hönig, Stefan
Zehethofer, Gerald
Mori, Gregor
author_facet Mujanović, Emir
Zajec, Bojan
Kosec, Tadeja
Legat, Andraž
Hönig, Stefan
Zehethofer, Gerald
Mori, Gregor
author_sort Mujanović, Emir
collection PubMed
description 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.
format Online
Article
Text
id pubmed-6926990
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-69269902019-12-24 Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH Mujanović, Emir Zajec, Bojan Kosec, Tadeja Legat, Andraž Hönig, Stefan Zehethofer, Gerald Mori, Gregor Materials (Basel) Article 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. MDPI 2019-11-20 /pmc/articles/PMC6926990/ /pubmed/31756966 http://dx.doi.org/10.3390/ma12233811 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mujanović, Emir
Zajec, Bojan
Kosec, Tadeja
Legat, Andraž
Hönig, Stefan
Zehethofer, Gerald
Mori, Gregor
Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
title Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
title_full Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
title_fullStr Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
title_full_unstemmed Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
title_short Activation and Repassivation of Stainless Steels in Artificial Brines as a Function of pH
title_sort activation and repassivation of stainless steels in artificial brines as a function of ph
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926990/
https://www.ncbi.nlm.nih.gov/pubmed/31756966
http://dx.doi.org/10.3390/ma12233811
work_keys_str_mv AT mujanovicemir activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph
AT zajecbojan activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph
AT kosectadeja activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph
AT legatandraz activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph
AT honigstefan activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph
AT zehethofergerald activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph
AT morigregor activationandrepassivationofstainlesssteelsinartificialbrinesasafunctionofph