Corrosion behavior of stainless steels in simulated PWR primary water: The effect of composition and matrix phases. (December 2020)

• Record Type: Journal Article
• Authors: Xiao, Qian; Jang, Changheui; Kim, Chaewon; Kim, Hyunmyung; Chen, Junjie; Lee, Hyeon Bae
• Is Part Of: Corrosion science. Volume 177(2020)
• Publication Date: 2020-12
• Subjects: Stainless steels -- Oxide film -- PWR primary water -- Cr content -- B2-NiAl; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108991
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Cr-rich (Cr2 O3 +FeCr2 O4 ) inner oxide layer on stainless steels with 22 wt% Cr. Cr-rich spinel inner oxide layer on stainless steels with 16 wt% Cr. B2-NiAl phase is oxidized as (Fe, Ni, Al)3 O4 fine spinel oxides. Phases (ferrite, austenite and B2-NiAl) affect corrosion behavior in addition to chemical composition. Abstract: Corrosion behavior in simulated pressurized water reactor (PWR) primary water was investigated for stainless steels with 16 and 22 wt% Cr having austenitic, ferritic, and duplex microstructure. For alloys with 22 wt% Cr, the Cr-rich inner oxide layer consisted of Cr2 O3 and FeCr2 O4 is formed. For alloys with 16 wt% Cr, the Cr-rich spinel inner oxide layer is formed. In-situ and ex-situ electrochemical impedance analyses and Mott-Schottky analysis was used to rank the corrosion resistance of the alloys. In addition to chemical composition, the phases (ferrite, austenite, and B2-NiAl) also affect the corrosion behaviors of the alloys.