High-Temperature Corrosion of Ni₃Al+ 2.9%Cr Alloy in Ar-0.2%SO₂ Gas

Abstract:

The high-temperature corrosion behavior of Ni₃Al+2.9 wt% Cr alloy was studied in SO₂-containing environment. Corrosion tests were carried out at 900, 1000, and 1100 °C for 100 h in atmospheric Ar-0.2% SO₂ gas. The alloy corroded relatively slowly due mainly to formation of Al₂O₃ in the scale. Its corrosion kinetics deviated from the parabolic corrosion rate law to a certain extent owing to ensuing scale spallation. This was attributed to (1) stress generated during scaling and the subsequent cooling period, (2) voids that formed due to the Kirkendall effect, and (3) incorporation of sulfur in the scale. The scale that formed after corrosion at 900 °C consisted of the outer NiO scale, middle NiAl₂O₄ scale, and inner Al₂O₃ scale. The increased corrosion rate at 1000 and 1100 °C led to formation of the outer NiO scale, and inner Al₂O₃ scale.

• Periodical: Key Engineering Materials (Volume 775)
• Pages: 441-447
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.775.441
• Online since: August 2018
• Authors: Dong Bok Lee, Min Jung Kim, Gyu Chul Cho, Soon Young Park, Poonam Yadav*
• Keywords: Ni₃Al, Oxidation, Scale, SO₂ Gas Corrosion, Sulfidation

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