Sulfidation–Oxidation Behavior of FeCrAl and TiCrAl and the Third-Element Effect

• Published in: Oxidation of metals Vol. 74; no. 1-2; pp. 1 - 9
• Main Authors: Brady, M. P., Tortorelli, P. F., More, K. L., Walker, L. R.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2010; Springer
• Subjects: ALLOYS; Applied sciences; BEHAVIOR; Chemistry and Materials Science; Communication; Corrosion; Corrosion and Coatings; Corrosion environments; CORROSION RESISTANCE; ENVIRONMENT; Exact sciences and technology; GETTERING; Inorganic Chemistry; MASS; MATERIALS SCIENCE; Metallic Materials; Metals. Metallurgy; OXIDATION; OXIDES; OXYGEN POTENTIAL; SOLID SOLUTIONS; STABILITY; TRANSIENTS; Tribology; YIELDS; Oxidation; Sulfidation; Third-element effect; Alumina; Titanium aluminide; Titanium Aluminides; Intermetallic compound; Composition effect; Sulfurization; Aluminium alloy; Titanium base alloys; Chromium alloy; Gas corrosion; Summation; Iron base alloys
• ISSN: 0030-770X; 1573-4889
• DOI: 10.1007/s11085-010-9194-6

Short-term sulfidation–oxidation exposures were conducted under high pS 2 and low pO 2 conditions for TiCrAl and FeCrAl alloys at 600 and 800 °C. Low mass gains and submicron Al-and Ti-rich oxide scales were formed on TiCrAl at 600 °C, while high mass gains and FeS-based scale formation were observed for FeCrAl. Based on the good behavior of TiCrAl, third-element effect additions of Cr are not inherently detrimental under sulfidation–oxidation conditions. Rather, differences in the mechanistic action of the third-element addition of Cr between FeCrAl and TiCrAl alloys and its relevance to low oxygen potential sulfidation–oxidation environments were the key factors in determining whether or not a protective alumina scale was established.