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Corrosion Characteristics of Corrosion-Resistant Metal with Different Composition Ratios of Acetic Acid and Acetonitrile at High Temperature and Pressure
고온 및 고압조건에서 아세트산과 아세토나이트릴의 성분비에 따른 부식저항성 금속의 부식특성
Hyun-Kyu Hwang, Dong-Ho Shin, Seung-Jun Lee, Seong-Jong Kim
황현규, 신동호, 이승준, 김성종
Keywords: Stainless steel, Acetic acid, Acetonitrile, Petrochemical plants, High temperature and pressure
Received: January 12, 2024; Revised: January 12, 2024; Accepted: February 07, 2024
Abstract: Acetic acid and acetonitrile produced in the chemical process of petrochemical plants are used at high temperatures and pressures. They are exposed to harsh corrosive environments. The present investigation aimed to evaluate corrosion characteristics of metals with excellent corrosion resistance by performing immersion and electrochemical experiments with different composition ratios of acetic acid and acetonitrile in a high-temperature and high-pressure environment. Results of immersion experiment revealed that as acetic acid concentration increased, surface damage and corrosion also increased. In immersion experiments under all conditions, super austenitic stainless steel (UNS N08367) had the best corrosion resistance among various metals. The maximum damage depth under the most severe immersion conditions was observed to be 4.19 μm, which was approximately 25.25 μm smaller than that of highly damaged stainless steel (UNS S31804). As a result of electrochemical experiments, electrochemical characteristics of various metals presented some differences with different composition ratios of acetic acid and acetonitrile. However, super austenitic stainless steel (UNS N08367) had the best corrosion resistance at a high pressure condition with a high concentration of acetic acid.