Corrosion Resistance of Metal Electrodes in an Iron Phosphate Melt
The corrosion resistance of Inconel 690 and 693 (both nickel-based alloy) has been investigated using samples submerged in an iron phosphate melt that contained 30 wt% of the simulated Hanford low activity nuclear waste (22.6% Na 2O, 20.0% Fe 2O 3, 52.2% P 2O 5, 2.9% SO 3, and 2.3% others, wt%) at 1050°C for 155 days. The weight loss for the submerged Inconel 690 and 693 samples was 14 and 8%, respectively. The overall corrosion rate, calculated from the initial and final dimensions of each sample, was 1.3 and 0.7 μm/day for the Inconel 690 and 693, respectively. The external surface of the corroded Inconel samples was depleted in nickel and the only corrosion product found by SEM-EDS and XRD on the external surface was (Fe, Cr) 2O 3. This layer appears to act as a chemically protective layer between the metal and iron phosphate melt. These preliminary results suggest that Inconel 690 and 693 have a good corrosion resistance in iron phosphate melts, with Inconel 693 having the better corrosion resistance.
C. Kim et al., "Corrosion Resistance of Metal Electrodes in an Iron Phosphate Melt," Environmental Issues and Waste Management Technologies in the Ceramic and Nuclear Industries X: Proceedings of the 106th Annual Meeting of the American Ceramic Society (2004, Indianapolis, IN), Ceramic Transactions, vol. 168, pp. 59-68, John Wiley & Sons, Jan 2005.
The definitive version is available at http://dx.doi.org/10.1002/9781118408438.ch5
106th Annual Meeting of the American Ceramic Society (2004: Apr. 18-21, Indianapolis, IN)
Mining and Nuclear Engineering
Materials Science and Engineering
Keywords and Phrases
Corrosion products; Corrosion rates; Iron phosphate; Metal electrodes
International Standard Serial Number (ISSN)
Article - Conference proceedings
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