Characterization of a Stressed Passive Film Using Scanning Electrochemical Microscope and Point Defect Model

Gao, Zhiming; Wang, Can; Miao, Weihang; Zhu, Renkang; Xia, Da-Hai

doi:10.1007/s12666-016-0930-8

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Therefore, it is urgently needed to comprehensively understand of the corrosion degradation mechanism of the SG tubing under the simulated service conditions, for managing the corrosion degradation of SG in a proactive manner. 8,9 The locations that corrosion degradation most possibly occurs are the crevices where are usually located between the tube-to-support plate and tube-to-tube sheet, or under deposits including thick freespan deposits and tubesheet sludge piles. 5,10 Some impurities including SO 4 2− and Cl − in the secondary loop water can concentrate within these crevices.…”

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confidence: 99%

Factors Influencing Passivity Breakdown on UNS N08800 in Neutral Chloride and Thiosulfate Solutions

Wang

Shi

et al. 2017

J. Electrochem. Soc.

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In this work, the passivity degradation of UNS N08800 in solutions containing Cl − and S 2 O 3 2− is studied by using polarization curve, electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS). Experimental results reveal that the passivity breakdown heavily depends on anodic potentials, concentration ratios of Cl − to S 2 O 3 2− , and the composition of materials. A combined effect between Cl − and S 2 O 3 2− on pitting corrosion is observed at high anodic potentials at which the passive film is broken down; in this situation, S 2 O 3 2− ions can enter into the pits by electromigration, and they are reduced to S ads and S 2− , stabilizing the metastable pits and accelerate the pit growth rate. However, there is no such combined effect at low anodic potentials when the passive film is intact, on the contrary, S 2 O 3 2− is beneficial to passivity in chloride solutions. At low anodic potentials, the interaction of S 2 O 3 2− with an intact passive layer is weak, and the adsorption of S 2 O 3 2− would mitigate the detrimental effect of Cl − ions.

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confidence: 99%