Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage
Corrosion behaviors of 316 stainless steel (316 ss) and Inconel 625 alloy in molten NaCl–KCl–ZnCl2 at 700°C and 900°C were investigated by immersion tests and electrochemical methods, including potentiodynamic polarization and electrochemical impedance spectroscopy. X-ray diffraction and scanning el...
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doaj-2fd5fc11ded146d19178b4107e9471042021-09-06T19:19:58ZengDe GruyterHigh Temperature Materials and Processes0334-64552191-03242020-07-0139134035010.1515/htmp-2020-0077htmp-2020-0077Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storageWang Mingjing0Zeng Song1Zhang Huihui2Zhu Ming3Lei Chengxin4Li Boshuai5Department of Material Science and Engineering, College of Material Sciences and Engineering, Xi’an University of Science and Technology, 58 Yanta Road, Shaanxi, 710054, ChinaDepartment of Material Science and Engineering, College of Material Sciences and Engineering, Xi’an University of Science and Technology, 58 Yanta Road, Shaanxi, 710054, ChinaDepartment of Material Science and Engineering, College of Material Sciences and Engineering, Xi’an University of Science and Technology, 58 Yanta Road, Shaanxi, 710054, ChinaDepartment of Material Science and Engineering, College of Material Sciences and Engineering, Xi’an University of Science and Technology, 58 Yanta Road, Shaanxi, 710054, ChinaDepartment of Material Science and Engineering, College of Material Sciences and Engineering, Xi’an University of Science and Technology, 58 Yanta Road, Shaanxi, 710054, ChinaDepartment of Material Science and Engineering, College of Material Sciences and Engineering, Xi’an University of Science and Technology, 58 Yanta Road, Shaanxi, 710054, ChinaCorrosion behaviors of 316 stainless steel (316 ss) and Inconel 625 alloy in molten NaCl–KCl–ZnCl2 at 700°C and 900°C were investigated by immersion tests and electrochemical methods, including potentiodynamic polarization and electrochemical impedance spectroscopy. X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy were used to analyze the phases and microstructures of the corrosion products. Inconel 625 alloy and 316 ss exhibited high corrosion rates in molten chlorides, and the corrosion rates of these two alloys accelerated when the temperature increased from 700°C to 900°C. The results of the electrochemical tests showed that both alloys exhibited active corrosion in chloride molten salt, and the current density of 316 ss in chloride molten salt at 700°C was 2.756 mA/cm−2, which is about three times the value for Inconel 625 alloy; and the values of the charge transfer resistance (Rt) for Inconel 625 were larger than those for 316 ss. The corrosion of these two alloys is owing to the preferred oxidation of Cr in chloride molten salt, and the corrosion layer was mainly ZnCr2O4 which was loose and porous and showed poor adherence to metal.https://doi.org/10.1515/htmp-2020-0077chloride molten saltscorrosionelectrochemicalinconel 625 alloy316 stainless steel |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wang Mingjing Zeng Song Zhang Huihui Zhu Ming Lei Chengxin Li Boshuai |
spellingShingle |
Wang Mingjing Zeng Song Zhang Huihui Zhu Ming Lei Chengxin Li Boshuai Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage High Temperature Materials and Processes chloride molten salts corrosion electrochemical inconel 625 alloy 316 stainless steel |
author_facet |
Wang Mingjing Zeng Song Zhang Huihui Zhu Ming Lei Chengxin Li Boshuai |
author_sort |
Wang Mingjing |
title |
Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage |
title_short |
Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage |
title_full |
Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage |
title_fullStr |
Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage |
title_full_unstemmed |
Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage |
title_sort |
corrosion behaviors of 316 stainless steel and inconel 625 alloy in chloride molten salts for solar energy storage |
publisher |
De Gruyter |
series |
High Temperature Materials and Processes |
issn |
0334-6455 2191-0324 |
publishDate |
2020-07-01 |
description |
Corrosion behaviors of 316 stainless steel (316 ss) and Inconel 625 alloy in molten NaCl–KCl–ZnCl2 at 700°C and 900°C were investigated by immersion tests and electrochemical methods, including potentiodynamic polarization and electrochemical impedance spectroscopy. X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy were used to analyze the phases and microstructures of the corrosion products. Inconel 625 alloy and 316 ss exhibited high corrosion rates in molten chlorides, and the corrosion rates of these two alloys accelerated when the temperature increased from 700°C to 900°C. The results of the electrochemical tests showed that both alloys exhibited active corrosion in chloride molten salt, and the current density of 316 ss in chloride molten salt at 700°C was 2.756 mA/cm−2, which is about three times the value for Inconel 625 alloy; and the values of the charge transfer resistance (Rt) for Inconel 625 were larger than those for 316 ss. The corrosion of these two alloys is owing to the preferred oxidation of Cr in chloride molten salt, and the corrosion layer was mainly ZnCr2O4 which was loose and porous and showed poor adherence to metal. |
topic |
chloride molten salts corrosion electrochemical inconel 625 alloy 316 stainless steel |
url |
https://doi.org/10.1515/htmp-2020-0077 |
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