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Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)

The aim of this investigation was to assess the corrosion behavior of gray cast iron (GCI) alloyed with copper. Alloyed GCI specimens were austempered isothermally at varying temperatures. After austenitizing at 927 °C, the samples were austempered at different temperatures ranging from 260 to 385 °...

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Autores principales: Seikh, Asiful H., Sarkar, Amit, Singh, Jitendra Kumar, Mohammed, Sohail M. A. Khan, Alharthi, Nabeel, Ghosh, Manojit
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384882/
https://www.ncbi.nlm.nih.gov/pubmed/30736386
http://dx.doi.org/10.3390/ma12030503
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author Seikh, Asiful H.
Sarkar, Amit
Singh, Jitendra Kumar
Mohammed, Sohail M. A. Khan
Alharthi, Nabeel
Ghosh, Manojit
author_facet Seikh, Asiful H.
Sarkar, Amit
Singh, Jitendra Kumar
Mohammed, Sohail M. A. Khan
Alharthi, Nabeel
Ghosh, Manojit
author_sort Seikh, Asiful H.
collection PubMed
description The aim of this investigation was to assess the corrosion behavior of gray cast iron (GCI) alloyed with copper. Alloyed GCI specimens were austempered isothermally at varying temperatures. After austenitizing at 927 °C, the samples were austempered at different temperatures ranging from 260 to 385 °C with an interval of 25 °C for 60 min. As a result, these samples developed an ausferrite matrix with different percentages of austenite. The resulting microstructures were evaluated and characterized by optical microscope (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The corrosion characteristics were determined using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) of these samples. These tests were carried out in a medium of 0.5 M H(2)SO(4) and 3.5% NaCl solution. It was observed from the potentiodynamic polarization results that with increasing austempering temperature, the corrosion rate decreased. All results of the EIS were in accordance with a constant phase element (CPE) model. It was found that with an increase in austempering temperature, the polarization resistance (R(p)) increased. The austenite content was also found to influence the corrosion behavior of the austempered gray cast iron (AGCI).
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spelling pubmed-63848822019-02-23 Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI) Seikh, Asiful H. Sarkar, Amit Singh, Jitendra Kumar Mohammed, Sohail M. A. Khan Alharthi, Nabeel Ghosh, Manojit Materials (Basel) Article The aim of this investigation was to assess the corrosion behavior of gray cast iron (GCI) alloyed with copper. Alloyed GCI specimens were austempered isothermally at varying temperatures. After austenitizing at 927 °C, the samples were austempered at different temperatures ranging from 260 to 385 °C with an interval of 25 °C for 60 min. As a result, these samples developed an ausferrite matrix with different percentages of austenite. The resulting microstructures were evaluated and characterized by optical microscope (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The corrosion characteristics were determined using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) of these samples. These tests were carried out in a medium of 0.5 M H(2)SO(4) and 3.5% NaCl solution. It was observed from the potentiodynamic polarization results that with increasing austempering temperature, the corrosion rate decreased. All results of the EIS were in accordance with a constant phase element (CPE) model. It was found that with an increase in austempering temperature, the polarization resistance (R(p)) increased. The austenite content was also found to influence the corrosion behavior of the austempered gray cast iron (AGCI). MDPI 2019-02-06 /pmc/articles/PMC6384882/ /pubmed/30736386 http://dx.doi.org/10.3390/ma12030503 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
Seikh, Asiful H.
Sarkar, Amit
Singh, Jitendra Kumar
Mohammed, Sohail M. A. Khan
Alharthi, Nabeel
Ghosh, Manojit
Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)
title Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)
title_full Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)
title_fullStr Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)
title_full_unstemmed Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)
title_short Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)
title_sort corrosion characteristics of copper-added austempered gray cast iron (agci)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384882/
https://www.ncbi.nlm.nih.gov/pubmed/30736386
http://dx.doi.org/10.3390/ma12030503
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