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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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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