산성 용액에서 전기화학적 특성과 침지 시간에 따른 고크롬 백주철의 부식 거동

• Published in: Corrosion science and technology Vol. 23; no. 4; pp. 310 - 314
• Main Authors: 이준섭, Jun-seob Lee, 바산자프오취개럴, Ochgerel Baasanjav, 오준석, Jun-seok Oh, 이재현, Je-hyun Lee
• Format: Journal Article
• Language: Korean
• Published: 한국부식방식학회 31.08.2024
• Subjects: Acidic solution; Corrosion; High chromium white cast iron
• ISSN: 1598-6462

The corrosion behavior of high chromium white cast iron was studied in 0.5 mol dm -3 H 2 SO 4 + 0.01 mol dm -3 HCl solution over time through electrochemical and immersion experiments. Potentiodynamic and potentiostatic polarizations revealed active-passivation transition behavior, with critical current densities observed at -0.27 VSSE and 0.00 VSSE, repectively. The former potential showed preferential dissolution of primary γ phases, while the latter one showed preferential dissolution of eutectic γ phases. Immersion tests showed an exponential increase in corrosion rate, with significant acceleration observed around 1000 seconds due to the onset of eutectic γ phase dissolution. Over a 24-hour immersion period, both γ phases exhibited extensive corrosion, leaving carbides largely intact. These findings elucidate distinct corrosion behaviors of high chromium white cast iron in acidic environments, providing critical insights into material performance evaluation. Understanding these mechanisms is essential for predicting the longevity and durability of materials in corrosive conditions, thereby informing better material design and application strategies.