Corrosion Resistance of Metal Electrodes in an Iron Phosphate Melt

Abstract

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.

Department(s)

Electrical and Computer Engineering

Second Department

Chemical and Biochemical Engineering

Third Department

Materials Science and Engineering

International Standard Serial Number (ISSN)

1042-1122

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Wiley-Blackwell, All rights reserved.

Publication Date

22 Aug 2005

This document is currently not available here.

Share

 
COinS