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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...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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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 |
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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 |
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