과망간산과 옥살산 화학제염 공정 시 원전기기용 STS 304의 부식 손상 특성

• Published in: Biuletyn Uniejowski Vol. 50; no. 4; pp. 251 - 258
• Main Authors: 한민수(Min-Su Han), 정광후(Kwang-Hu Jung), 양예진(Ye-Jin Yang), 박일초(Il-Cho Park), 김기철(Ki-Chul Kim), 서범철(Bum-Chul Seo), 박주현(Ju-Hyun Park), 김성종(Seong-Jong Kim)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2017
• Subjects: 기계공학; Corrosion damage behavior; Oxalic acid; STS 304; Chemical decontamination; Permanganic acid
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JKISE.2017.50.4.251/

This study was carried out with solution temperature variables of $75^{\circ}C$ and $90^{\circ}C$ for STS 304, which is a nuclear equipment material, in order to determine the corrosion damage behavior in chemical decontamination process using permanganic acid and oxalic acid. Then electrochemical polarization experiment, weight loss measurement, surface morphology observation and surface damage depth were measured every cycle of the decontamination process to analyze the degree of corrosion damage. As a result, the corrosion current density, weight loss, and surface damage increased as the decontamination process cycle increased, and the corrosion damage of STS 304 tended to increase. Few ${\mu}m$ pitting damage was observed on the surface observation. In 5 cycle, the elongated wormhole-type pitting damage appeared, leading to relatively large surface damage. However, there was no significant difference in the degree of surface damage resulting from the increase in the temperature of the chemical decontamination solution.