Passivation Degradation of Alloy 800 in Boiling Solution Containing Thiosulphate. (10th April 2017)

• Record Type: Journal Article
• Authors: Shen, Chen; Xia, Da-Hai; Fan, Hong-Qiang; Behnamian, Yashar; Afacan, Artin; Klimas, Stan J.; Luo, Jing-Li
• Is Part Of: Electrochimica acta. Volume 233(2017)
• Page Start: 13
• Page End: 25
• Publication Date: 2017-04-10
• Subjects: Thiosulphate Corrosion -- Boiling electrolyte -- Alloy 800 -- Passive layer; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.03.037
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: The effect of boiling bubbles on the passivation degradation of Alloy 800 in thiosulphate-containing aqueous electrolyte was experimentally investigated using corrosion potential, anodic polarization, combined with Secondary Ion Mass Spectrometry (SIMS) and X-ray Photoelectron Spectroscopy (XPS). The results showed that the boiling bubbles decreased the pitting potential by enhancing the mass transport. The specimen immersed in boiling electrolyte have a thicker anodic film and a greater amount of sulfur incorporation into the passive layer compared with the experiments at 99 °C. Moreover, a higher ratio of low valance sulfur species was detected on the specimen in boiling test electrolyte, indicating that the boiling bubbles reduced the corrosion resistance of Alloy 800.