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김지현

Kim, Ji Hyun
UNIST Nuclear Innovative Materials Lab.
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Enhancement of corrosion resistance in carbon steels using nickel-phosphorous/titanium dioxide nanocomposite coatings under high-temperature flowing water

Author(s)
Kim, SeunghyunKim, Jeong WonKim, Ji Hyun
Issued Date
2017-03
DOI
10.1016/j.jallcom.2016.12.027
URI
https://scholarworks.unist.ac.kr/handle/201301/21142
Fulltext
http://www.sciencedirect.com/science/article/pii/S0925838816339354
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.698, pp.267 - 275
Abstract
To mitigate the corrosion of carbon steels in high-temperature flowing water, we deposited Ni-P/TiO2 nanocomposite coatings, composed of a Ni-P alloy matrix with dispersed TiO2 nanoparticles. Their morphology, early-stage open-circuit voltage, weight loss, and microstructure evolution after the tests, performed in a temperature range of 125 degrees C-175 degrees C with 5 m/s flow, were investigated. The incorporation of TiO2 nanoparticles in electroless Ni-P matrix was found to change the microstructure and improve the corrosion resistance especially at 150 degrees C. At 150 degrees C, the Ni-P alloy undergoes severe corrosion with the detachment of NiO while the Ni-P/TiO2 nanocomposite coatings remain passive by the galvanic coupling of the Ni-P matrix and the nanoparticles. Based on this study, TiO2 nanoparticles are found to enhance the passivation of the Ni-P alloy and, consequently, improve corrosion resistance in high-temperature flowing water.
Publisher
ELSEVIER SCIENCE SA
ISSN
0925-8388
Keyword (Author)
Metal matrix compositesChemical synthesisCorrosionMicrostructure
Keyword
NUCLEAR-POWER-PLANTNI-P COATINGSCOMPOSITE COATINGSACCELERATED CORROSIONELECTROLESS NICKELELEVATED-TEMPERATURESWEAR CHARACTERISTICSTIO2 NANOPARTICLESALKALINE-SOLUTIONPHASE-STABILITY

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