Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

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...

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Bibliographic Details
Published inMetals (Basel ) Vol. 5; no. 4; pp. 2372 - 2382
Main Authors Jeon, Soon-Hyeok, Song, Geun-Dong, Hur, Do
Format Journal Article
LanguageEnglish
Published MDPI AG 14.12.2015
Subjects
Alloy 690
electrodeposition
galvanic corrosion
magnetite
steam generator tube
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met5042372