The corrosion resistance of surface-modified T22 steel for use as superheater tubes in waste incinerators was evaluated by laboratory and field corrosion tests. The specimen surface was coated with a Ni-30at.%Cr-15at.%Al film approximately 10μm thick by unbalanced-magnetron (UBM) sputtering, and then preoxidized for 12h at 1000°C in dry laboratory air. Laboratory corrosion testing was conducted by coating with synthetic ash in a gas mixture of 1000ppmHCl-50ppmSO2-10%O2-10%CO2- 20%H2O-bal.N2 for 100h at 550°C. The preoxidized specimen showed virtually no thickness loss due to corrosion, indicating excellent corrosion resistance in the laboratory corrosion environment for 100h.

Subject
X-ray diffraction, Nickel coatings, Coatings, Corrosion resistant alloys, Nickel based alloys, Tubes, Corrosion testing, Thickness loss, Sputter deposition, Steel, Ash, Corrosion resistance, Wastes
Keywords:
high temperature corrosion, waste incinerator, fused salt, hot corrosion, fireside corrosion, superheater tube, surface modification
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2001
GOV
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