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Corrosion Mitigation of Nickel Alloy Metals in Molten Chloride Salts.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Corrosion Mitigation of Nickel Alloy Metals in Molten Chloride Salts./
Author:	Gray, Alexis Morgan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	152 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28719765
ISBN:	9798538153640

Corrosion Mitigation of Nickel Alloy Metals in Molten Chloride Salts.
Gray, Alexis Morgan.

Corrosion Mitigation of Nickel Alloy Metals in Molten Chloride Salts. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 152 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--The University of Arizona, 2021.

This item must not be sold to any third party vendors.

Corrosion mitigation of nickel alloy metals in molten chloride salts at 800ºC is desired for next-generation concentrating solar power plants, which use high temperature heat transfer fluids to increase operating efficiency and enable CO2 instead of the steam turbine. The ternary eutectic mix NaCl-KCl-MgCl2 is the leading candidate for the heat transfer fluids because it has high temperature stability and good heat transfer properties. However, impurities, especially water, drives corrosion of the metal containers in contact with the molten chloride salt. Although higher operating temperatures increase efficiency, the corrosion rates also increase with increasing temperatures. Purification processes have been developed to remove corrosive impurities; however leaks can reintroduce oxidant impurities. Here, new methods are discussed to detect leaks and arrest corrosion of metal in contact with molten chloride salts. There were three primary tasks in this work, described below.(1) Determine the reduction potential of nickel and chromium ions, the two major alloyed elements in Haynes 230, in molten NaCl-KCl at 800ºC using cyclic voltammetry and differential pulse voltammetry of the metal surface.(2) The open circuit potentials and corrosion rates have been measured for pure alloyed elements Ni, Cr, W, and Mo and alloys Haynes 230 and nichrome in binary NaCl-KCl and ternary NaCl-KCl-MgCl2 at 800ºC.(3) The corrosion of Haynes 230 in NaCl-KCl-MgCl2 at 800ºC was arrested by applying a cathodic potential. The cathodic protection of H230 was done two ways i) by forming a galvanic couple between H230 and Cr by shorting the H230 cathode to Cr, a less-noble sacrificial anode, and ii) by inserting a voltage source between the H230 and Cr anode so the cathodic potential on H230 could be increased leading to a cathodic current from the Cr anode to the H230 cathode.

ISBN: 9798538153640Subjects--Topical Terms:

560457
Chemical engineering.
Subjects--Index Terms:

Cathodic protection

Corrosion Mitigation of Nickel Alloy Metals in Molten Chloride Salts.
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300 $a 152 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
500 $a Advisor: Gervasio, Dominic.
502 $a Thesis (Ph.D.)--The University of Arizona, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Corrosion mitigation of nickel alloy metals in molten chloride salts at 800ºC is desired for next-generation concentrating solar power plants, which use high temperature heat transfer fluids to increase operating efficiency and enable CO2 instead of the steam turbine. The ternary eutectic mix NaCl-KCl-MgCl2 is the leading candidate for the heat transfer fluids because it has high temperature stability and good heat transfer properties. However, impurities, especially water, drives corrosion of the metal containers in contact with the molten chloride salt. Although higher operating temperatures increase efficiency, the corrosion rates also increase with increasing temperatures. Purification processes have been developed to remove corrosive impurities; however leaks can reintroduce oxidant impurities. Here, new methods are discussed to detect leaks and arrest corrosion of metal in contact with molten chloride salts. There were three primary tasks in this work, described below.(1) Determine the reduction potential of nickel and chromium ions, the two major alloyed elements in Haynes 230, in molten NaCl-KCl at 800ºC using cyclic voltammetry and differential pulse voltammetry of the metal surface.(2) The open circuit potentials and corrosion rates have been measured for pure alloyed elements Ni, Cr, W, and Mo and alloys Haynes 230 and nichrome in binary NaCl-KCl and ternary NaCl-KCl-MgCl2 at 800ºC.(3) The corrosion of Haynes 230 in NaCl-KCl-MgCl2 at 800ºC was arrested by applying a cathodic potential. The cathodic protection of H230 was done two ways i) by forming a galvanic couple between H230 and Cr by shorting the H230 cathode to Cr, a less-noble sacrificial anode, and ii) by inserting a voltage source between the H230 and Cr anode so the cathodic potential on H230 could be increased leading to a cathodic current from the Cr anode to the H230 cathode.
590 $a School code: 0009.
650 4 $a Chemical engineering. $3 560457
650 4 $a Engineering. $3 586835
650 4 $a Chemistry. $3 516420
650 4 $a Metals. $3 601053
650 4 $a Chloride. $3 3681736
650 4 $a Electrodes. $3 629151
650 4 $a Microbial corrosion. $3 3683894
650 4 $a Carbon. $3 604057
650 4 $a Atmospheric corrosion. $3 3560294
650 4 $a Stainless steel. $3 3560388
650 4 $a Fluorides. $3 620981
650 4 $a Voltammetry. $3 3681694
650 4 $a Alloys. $3 654175
650 4 $a Physical properties. $3 3564184
650 4 $a Cathodic protection. $3 2148114
653 $a Cathodic protection
653 $a Corrosion rate
653 $a Haynes 230
653 $a Molten chloride salts
653 $a Nickel alloys
653 $a Reduction potentials
690 $a 0542
690 $a 0537
690 $a 0485
710 2 $a The University of Arizona. $b Chemical Engineering. $3 1669526
773 0 $t Dissertations Abstracts International $g 83-03B.
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791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28719765