Effect of Salt Deposits on Corrosion Behavior of Ni-Based Alloys in Supercritical Water Oxidation of High-Salinity Organic Wastewater
Publication: Journal of Environmental Engineering
Volume 145, Issue 11
Abstract
In this study, the corrosion behavior of nickel-based alloys 625, 825, and 800 with a salt deposit layer was investigated in supercritical water containing a dissolved oxygen of 5,000 ppm at 400°C. Scanning electron microscopy, energy-dispersive spectroscopy, atomic force microscope, X-ray diffraction, and laser Raman spectroscopy were used to investigate the morphologies and compositions of samples. Control experiments were performed to investigate the effects of a salt deposit layer. The presence of one salt deposit layer on the sample surface resulted in the occurrence of an acidic and oxidizing microenvironment between the alloy surface and the salt deposit layer, evidently enhancing the corrosion of nickel-based alloys. A comparison of the corrosion resistances among Alloys 825, 800, and 625 indicated that Alloy 825 is the best. Additionally, a suggestion for materials selection in supercritical water oxidation plants for high-salinity organic wastewater treatment was proposed.
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Acknowledgments
This research is supported by China Postdoctoral Science Foundation (2019TQ0248), National Key Research and Development Program of China (No. 2016YFC0801904), the Fundamental Research Funds for the Central Universities (xjj2018201), the Fund Project of Shaanxi Key Laboratory of Land Consolidation (2018-JC09), the Projects from National Natural Science Foundation of China (51871179, 21576219, 51406146, 51876174) and Shannxi Province Natural Science Foundation of China (2018JM5011).
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Published In
Journal of Environmental Engineering
Volume 145 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Aug 27, 2018
Accepted: Jan 4, 2019
Published online: Sep 9, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 9, 2020
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