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Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel

Potassium ferricyanide and potassium ferrocyanide were used to observe and monitor the pitting corrosion of 304 stainless steel (SS) at anodic polarization in situ. The results show that there are Fe(3+) ions around the corrosion pit when pitting occurs on 304 SS in NaCl aqueous solution. The effect...

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Autores principales: Zhang, Hao, Du, Nan, Wang, Shuaixing, Zhao, Qing, Zhou, Wenjie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040822/
https://www.ncbi.nlm.nih.gov/pubmed/32033445
http://dx.doi.org/10.3390/ma13030726
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author Zhang, Hao
Du, Nan
Wang, Shuaixing
Zhao, Qing
Zhou, Wenjie
author_facet Zhang, Hao
Du, Nan
Wang, Shuaixing
Zhao, Qing
Zhou, Wenjie
author_sort Zhang, Hao
collection PubMed
description Potassium ferricyanide and potassium ferrocyanide were used to observe and monitor the pitting corrosion of 304 stainless steel (SS) at anodic polarization in situ. The results show that there are Fe(3+) ions around the corrosion pit when pitting occurs on 304 SS in NaCl aqueous solution. The effect of Fe(3+) surrounded pits on the pitting corrosion was also studied by testing the electrochemical behavior of 304 SS in different Fe(3+)/Fe(2+) solutions. The presence of Fe(3+) leads to the positive shift of corrosion potential and the increase of corrosion rate of 304 SS. There are two possible reasons for this phenomenon. On the one hand, Fe(3+) hydrolysis results in the decrease of pH value of solution. At the same iron ion concentration, the higher the Fe(3+) ion concentration, the lower the solution pH value. On the other hand, Fe(3+) may reduce on the electrode surface. The decrease of solution pH and the reduction of Fe(3+) resulted in the acceleration of the corrosion rate.
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spelling pubmed-70408222020-03-09 Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel Zhang, Hao Du, Nan Wang, Shuaixing Zhao, Qing Zhou, Wenjie Materials (Basel) Article Potassium ferricyanide and potassium ferrocyanide were used to observe and monitor the pitting corrosion of 304 stainless steel (SS) at anodic polarization in situ. The results show that there are Fe(3+) ions around the corrosion pit when pitting occurs on 304 SS in NaCl aqueous solution. The effect of Fe(3+) surrounded pits on the pitting corrosion was also studied by testing the electrochemical behavior of 304 SS in different Fe(3+)/Fe(2+) solutions. The presence of Fe(3+) leads to the positive shift of corrosion potential and the increase of corrosion rate of 304 SS. There are two possible reasons for this phenomenon. On the one hand, Fe(3+) hydrolysis results in the decrease of pH value of solution. At the same iron ion concentration, the higher the Fe(3+) ion concentration, the lower the solution pH value. On the other hand, Fe(3+) may reduce on the electrode surface. The decrease of solution pH and the reduction of Fe(3+) resulted in the acceleration of the corrosion rate. MDPI 2020-02-05 /pmc/articles/PMC7040822/ /pubmed/32033445 http://dx.doi.org/10.3390/ma13030726 Text en © 2020 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
Zhang, Hao
Du, Nan
Wang, Shuaixing
Zhao, Qing
Zhou, Wenjie
Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel
title Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel
title_full Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel
title_fullStr Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel
title_full_unstemmed Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel
title_short Determination of Iron Valence States Around Pits and the Influence of Fe(3+) on the Pitting Corrosion of 304 Stainless Steel
title_sort determination of iron valence states around pits and the influence of fe(3+) on the pitting corrosion of 304 stainless steel
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040822/
https://www.ncbi.nlm.nih.gov/pubmed/32033445
http://dx.doi.org/10.3390/ma13030726
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