Corrosion behaviors of Zr-Sn-Nb-Fe-Mo alloys in pure water at 360 °C/18.6 MPa: Influence of annealing temperature on the anti-corrosion properties. (February 2020)

• Record Type: Journal Article
• Authors: Shi, Huigang; Li, Jiuxiao; Mao, Jianwei; Lu, Weijie
• Is Part Of: Corrosion science. Volume 163(2020)
• Publication Date: 2020-02
• Subjects: Zirconium alloys -- Raman spectroscopy -- Crack formation -- Corrosion resistance -- Stress distribution; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108255
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Alloys with lower recrystallization degree have worse corrosion resistance. The faster oxidation rate was caused by the higher fraction of grain boundary area. Two mechanisms are responsible for the crack formation in the oxide films. The large lateral cracks are the result of inter-connection of micro-cracks. Abstract: Zr-Sn-Nb-Fe-Mo alloys are heat treated at two different temperatures (480 and 550 °C). A better corrosion resistance is obtained when annealed at 550 °C. The lower oxidation rate is attributed to the reduction of oxide grain boundary area, as the grain boundaries are the most common short-circuiting paths for oxygen diffusion. Two mechanisms are responsible for crack formation in the oxide: phase transition from tetragonal to monoclinic and delayed oxidation of precipitates. The cracks are generated continuously and linked together to form long cracks, leading to the delamination of oxide films and stress relaxation in the oxide.