Thermogravimetric analysis-mass spectrometry study of steam oxidation resistance of HCM12A steel at 650°C and 700°C

• Published in: Corrosion engineering, science, and technology Vol. 57; no. 3; pp. 223 - 231
• Main Authors: Castañeda, S. I., Marulanda, J. L., Pérez, F. J.
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 03.04.2022; SAGE Publications
• Subjects: ferritic/martensitic steel; Mass spectrometry; steam oxidation; thermogravimetry measurement; volatile species; steam oxidation; thermogravimetry measurement; volatile species; Mass spectrometry; ferritic/martensitic steel
• ISSN: 1478-422X; 1743-2782
• DOI: 10.1080/1478422X.2021.2019880

Ferritic/martensitic HCM12A steel specimens were subjected to 190 h of oxidation in Ar + 40% H 2 O at 650°C and 700°C. Simultaneous measurements of mass spectrometry and thermogravimetric analysis by a mass spectrometer and a thermobalance of symmetrical furnaces were made. Thermogravimetric measurements verified that the mass gain after oxidation at 650°C was 0.07 mg/cm 2 , whereas at 700°C the mass gain corresponded to ∼1.3 times that at 650°C. Mass spectrometry measurements indicated the presence of only a volatile species of low-intensity chromium (order of ppm) at 700°C (i.e. CrO 2 (g)) after between 175 and 190 h of oxidation. At reduced oxidation times, no volatile species were observed. We did not observe any gaseous species at 650°C. The morphology, composition, and structure of samples by scanning electron microscopy, backscattered electron detection, X-ray energy-dispersive spectrometry and X-ray diffraction are described.