Corrosion of Commercial Nickel Based Hastelloys Exposed to Molten ZnCl2 based Salt Systems

Persistent Link:
http://hdl.handle.net/10150/623147
Title:
Corrosion of Commercial Nickel Based Hastelloys Exposed to Molten ZnCl2 based Salt Systems
Author:
T Devaadithya Gardiya Wasam Lidamulage, Chrishani Maheswari
Issue Date:
2017
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Embargo:
Release after 15-Aug-2017
Abstract:
Concentrating solar power (CSP) systems are a promising technology which helps to reduce greenhouse gas emissions linked with electricity generation. Molten salt systems such as nitrides, nitrates and are widely used as heat transfer fluids (HTF) in CSP plants. HTF is one of the most important components for overall performance and efficiency of the CSP system. The heat transfer fluids currently used in CSP systems are either hydrocarbon oils or alkali- nitrate based eutectic slat mixtures. Both nitrate based salts and hydrocarbon oil have limited operating temperature and thermal. Hence there is a need to come up with a new heat transfer fluids made from inexpensive naturally abundant materials, which are stable up to 1000ᵒC. The Multidisciplinary University Research Initiative (MURI) team based at U of A has proposed molten chloride eutectic salt systems (NaCl,KCl, ZnCl2) as a commercially viable HTFs. Indeed molten chloride eutectic salt systems increase the efficiency of the CSP systems at high temperatures while remaining stable and producing low vapor pressure. However, they raise the risk of potential corrosion in piping / container alloys. The main objectives of this work is to understand the corrosion mechanisms of metal alloys in contact with ZnCl2 based salt systems, purify low purity grade ZnCl2 salts in cost effective way and to investigate the alternative alloys, which are resistant to corrosion by ZnCl2.
Type:
text; Electronic Thesis
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Materials Science & Engineering
Degree Grantor:
University of Arizona
Advisor:
Lucas, Pierre

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleCorrosion of Commercial Nickel Based Hastelloys Exposed to Molten ZnCl2 based Salt Systemsen_US
dc.creatorT Devaadithya Gardiya Wasam Lidamulage, Chrishani Maheswarien
dc.contributor.authorT Devaadithya Gardiya Wasam Lidamulage, Chrishani Maheswarien
dc.date.issued2017-
dc.publisherThe University of Arizona.en
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en
dc.description.releaseRelease after 15-Aug-2017en
dc.description.abstractConcentrating solar power (CSP) systems are a promising technology which helps to reduce greenhouse gas emissions linked with electricity generation. Molten salt systems such as nitrides, nitrates and are widely used as heat transfer fluids (HTF) in CSP plants. HTF is one of the most important components for overall performance and efficiency of the CSP system. The heat transfer fluids currently used in CSP systems are either hydrocarbon oils or alkali- nitrate based eutectic slat mixtures. Both nitrate based salts and hydrocarbon oil have limited operating temperature and thermal. Hence there is a need to come up with a new heat transfer fluids made from inexpensive naturally abundant materials, which are stable up to 1000ᵒC. The Multidisciplinary University Research Initiative (MURI) team based at U of A has proposed molten chloride eutectic salt systems (NaCl,KCl, ZnCl2) as a commercially viable HTFs. Indeed molten chloride eutectic salt systems increase the efficiency of the CSP systems at high temperatures while remaining stable and producing low vapor pressure. However, they raise the risk of potential corrosion in piping / container alloys. The main objectives of this work is to understand the corrosion mechanisms of metal alloys in contact with ZnCl2 based salt systems, purify low purity grade ZnCl2 salts in cost effective way and to investigate the alternative alloys, which are resistant to corrosion by ZnCl2.en
dc.typetexten
dc.typeElectronic Thesisen
thesis.degree.nameM.S.en
thesis.degree.levelmastersen
thesis.degree.disciplineGraduate Collegeen
thesis.degree.disciplineMaterials Science & Engineeringen
thesis.degree.grantorUniversity of Arizonaen
dc.contributor.advisorLucas, Pierreen
dc.contributor.committeememberLucas, Pierreen
dc.contributor.committeememberDeymier, Pierreen
dc.contributor.committeememberMuralidharan, Krishnaen
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.