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Metals 2015, 5(4), 2372-2382; doi:10.3390/met5042372

Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

Nuclear Materials Safety Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
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Author to whom correspondence should be addressed.
Academic Editors: Vineet V. Joshi and Alan Meier
Received: 15 October 2015 / Revised: 18 November 2015 / Accepted: 9 December 2015 / Published: 14 December 2015
(This article belongs to the Special Issue Oxidation of Metals)
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Abstract

The galvanic corrosion behavior of Alloy 690 coupled with magnetite has been investigated in an alkaline solution at 30 °C and 60 °C using a potentiodynamic polarization method and a zero resistance ammeter. The positive current values were recorded in the galvanic couple and the corrosion potential of Alloy 690 was relatively lower. These results indicate that Alloy 690 behaves as the anode of the pair. The galvanic coupling between Alloy 690 and magnetite increased the corrosion rate of Alloy 690. The temperature increase led to an increase in the extent of galvanic effect and a decrease in the stability of passive film. Galvanic effect between Alloy 690 and magnetite is proposed as an additional factor accelerating the corrosion rate of Alloy 690 steam generator tubing in secondary water. View Full-Text
Keywords: Alloy 690; magnetite; galvanic corrosion; steam generator tube; electrodeposition Alloy 690; magnetite; galvanic corrosion; steam generator tube; electrodeposition
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jeon, S.-H.; Song, G.-D.; Hur, D.H. Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions. Metals 2015, 5, 2372-2382.

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