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Materials 2018, 11(1), 62; doi:10.3390/ma11010062

Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes

Nuclear Materials Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
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Received: 10 October 2017 / Revised: 17 November 2017 / Accepted: 17 November 2017 / Published: 2 January 2018
(This article belongs to the Section Porous Materials)
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Abstract

In nuclear power plants, the main corrosion product that is deposited on the outside of steam generator tubes is porous magnetite. The objective of this study was to simulate porous magnetite that is deposited on thermally treated (TT) Alloy 690 steam generator tubes. A magnetite layer was electrodeposited on an Alloy 690TT substrate in an Fe(III)-triethanolamine solution. After electrodeposition, the dense magnetite layer was immersed to simulate porous magnetite deposits in alkaline solution for 50 days at room temperature. The dense morphology of the magnetite layer was changed to a porous structure by reductive dissolution reaction. The simulated porous magnetite layer was compared with flakes of steam generator tubes, which were collected from the secondary water system of a real nuclear power plant during sludge lancing. Possible nuclear research applications using simulated porous magnetite specimens are also proposed. View Full-Text
Keywords: electrodeposition; magnetite; steam generator; flake; sludge electrodeposition; magnetite; steam generator; flake; sludge
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Jeon, S.-H.; Son, Y.-H.; Choi, W.-I.; Song, G.D.; Hur, D.H. Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes. Materials 2018, 11, 62.

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