The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants

The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants

Cast iron is primarily used in buried piping to transport water in the fire protection system of nuclear power plants; ductile cast iron is generally used for domestic nuclear power plants. In general, the fluid used as fire-extinguishing water in such fire protection systems is tap water, and corro...

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Main Authors: Butaek Lim, Kitae Kim, Hyunyoung Chang, Heungbae Park, Youngsik Kim
Format: Article
Language:English
Published: MDPI AG 2020-11-01
Series:Metals
Subjects:
ductile cast iron
corrosion inhibitor
tungstate
passivation
adsorption
ethanolamine
Online Access:https://www.mdpi.com/2075-4701/10/12/1597
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spelling doaj-8bd5fcbc46534ee0a04833019e5566732020-11-29T00:04:49ZengMDPI AGMetals2075-47012020-11-01101597159710.3390/met10121597The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power PlantsButaek Lim0Kitae Kim1Hyunyoung Chang2Heungbae Park3Youngsik Kim4Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University, 1375 Gyeongdongro, Andong 36729, KoreaMaterials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University, 1375 Gyeongdongro, Andong 36729, KoreaKEPCO Engineering & Construction Company, 269, Hyeoksinro, Gimcheon, Gyeongbuk 39660, KoreaKEPCO Engineering & Construction Company, 269, Hyeoksinro, Gimcheon, Gyeongbuk 39660, KoreaMaterials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University, 1375 Gyeongdongro, Andong 36729, KoreaCast iron is primarily used in buried piping to transport water in the fire protection system of nuclear power plants; ductile cast iron is generally used for domestic nuclear power plants. In general, the fluid used as fire-extinguishing water in such fire protection systems is tap water, and corrosion inhibitors are not currently added. In this study, the synergistic effect of an adsorption barrier (monoethanolamine) and oxidized film in an environment with a corrosion inhibitor (tungstate) is examined, and the corresponding passivation properties are presented. An immersion corrosion test and electrochemical test in tap water to which only tungstate was added showed suppression of corrosion compared to molybdate at the same concentration. The polarization resistance value of a passivation film in tap water mixed with monoethanolamine and tungstate showed better results than that of the molybdate control. A surface analysis in mixed addition tap water also demonstrated that oxygen ions were sufficiently distributed, including at some spheroidized graphite sites, when tungstate was added compared to molybdate. In addition, the amount of tungsten ions adsorbed on the surface was larger than that of molybdenum ions, and it was confirmed that tungsten ions were evenly distributed over the entire surface.https://www.mdpi.com/2075-4701/10/12/1597ductile cast ironcorrosion inhibitortungstatepassivationadsorptionethanolamine
collection DOAJ
language English
format Article
sources DOAJ
author Butaek Lim
Kitae Kim
Hyunyoung Chang
Heungbae Park
Youngsik Kim
spellingShingle Butaek Lim
Kitae Kim
Hyunyoung Chang
Heungbae Park
Youngsik Kim
The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants
Metals
ductile cast iron
corrosion inhibitor
tungstate
passivation
adsorption
ethanolamine
author_facet Butaek Lim
Kitae Kim
Hyunyoung Chang
Heungbae Park
Youngsik Kim
author_sort Butaek Lim
title The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants
title_short The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants
title_full The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants
title_fullStr The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants
title_full_unstemmed The Effect of Tungstate and Ethanolamines Added in Tap Water on Corrosion Inhibition of Ductile Cast Iron Pipe for Nuclear Power Plants
title_sort effect of tungstate and ethanolamines added in tap water on corrosion inhibition of ductile cast iron pipe for nuclear power plants
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2020-11-01
description Cast iron is primarily used in buried piping to transport water in the fire protection system of nuclear power plants; ductile cast iron is generally used for domestic nuclear power plants. In general, the fluid used as fire-extinguishing water in such fire protection systems is tap water, and corrosion inhibitors are not currently added. In this study, the synergistic effect of an adsorption barrier (monoethanolamine) and oxidized film in an environment with a corrosion inhibitor (tungstate) is examined, and the corresponding passivation properties are presented. An immersion corrosion test and electrochemical test in tap water to which only tungstate was added showed suppression of corrosion compared to molybdate at the same concentration. The polarization resistance value of a passivation film in tap water mixed with monoethanolamine and tungstate showed better results than that of the molybdate control. A surface analysis in mixed addition tap water also demonstrated that oxygen ions were sufficiently distributed, including at some spheroidized graphite sites, when tungstate was added compared to molybdate. In addition, the amount of tungsten ions adsorbed on the surface was larger than that of molybdenum ions, and it was confirmed that tungsten ions were evenly distributed over the entire surface.
topic ductile cast iron
corrosion inhibitor
tungstate
passivation
adsorption
ethanolamine
url https://www.mdpi.com/2075-4701/10/12/1597
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