Fluid dynamic simulation of CrO2(OH)2 volatilization and gas phase evolution during the oxidation of a chromia forming alloy. (15th July 2022)

• Record Type: Journal Article
• Authors: Oger, L.; Vergnes, H.; Caussat, B.; Monceau, D.; Vande Put, A.
• Is Part Of: Corrosion science. Volume 203(2022)
• Publication Date: 2022-07-15
• Subjects: Nickel (A) -- Superalloys (A) -- Weight loss (B) -- Modeling studies (B) -- Oxidation (C); Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110306
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The influence of the chromia volatilization on the oxidation kinetics of Inconel 625 was investigated at 900 °C under flowing wet air (74%N2 -18.5%O2 -7.5%H2 O) through an interdisciplinary approach, coupling experiments and gas phase simulation. Oxidation tests showed a strong decrease in the volatilization rate of lined-up samples from the inlet to the outlet of a horizontal tubular furnace. Gas phase simulation allowed to relate it to an increase in the CrO2 (OH)2 partial pressure along the tube. Considering gas composition changes appears as essential to provide correct interpretation of oxidation test results in humid and oxidizing environments. Graphical Abstract: ga1 Highlights: Coupling of oxidations tests and computational fluid dynamics simulations. Volatilization of Cr2 O3 during high-temperature oxidation in humid gas flow. Gas composition change due to CrO2 (OH)2 enrichment during volatilization. For lined-up samples, volatilization rates decrease from the inlet to the outlet. Volatilization can be mitigated by increasing CrO2 (OH)2 amount in the gas flow.