Corrosion behavior of 14Cr ODS steel in supercritical water: The influence of substituting Y2O3 with Y2Ti2O7 nanoparticles. (February 2020)

• Record Type: Journal Article
• Authors: Zhao, Haozhi; Liu, Tong; Bai, Zhonglian; Wang, Linbo; Gao, Wenhua; Zhang, Lefu
• Is Part Of: Corrosion science. Volume 163(2020)
• Publication Date: 2020-02
• Subjects: A. ODS steel -- B. X-ray diffraction -- B. SEM -- C. Oxidation -- C. Supercritical water; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108272
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The 14Cr ODS steel was prepared by replacing Y2 O3 with Y2 Ti2 O7 nanoparticles. Y2 Ti2 O7 -ODS steel showed better corrosion resistance in SCW for 1500 h. A bilayer structure was formed in the corrosion scale of ODS steels. The finer Y2 Ti2 O7 exhibited more effective hindrance impacts on diffusion of ions. Adding Y2 Ti2 O7 can inhibit the formation of coarse Y-Al-O particles. Abstract: 14Cr-4.5Al ODS steels were prepared by adding Y2 Ti2 O7 and Y2 O3 nanoparticles respectively. Bilayer-structure corrosion scales were formed while the Y2 Ti2 O7 -ODS steel showed a lower mass gain of 108.1 mg/dm 2 in SCW for 1500 h. Compared with Y2 O3, Y2 Ti2 O7 with finer size and higher number density exhibited more effective hindrance impacts on the diffusion of ions. Furthermore, adding Y2 Ti2 O7 in the ODS steel can provide more zero valent Al to form alumina film through inhibiting the formation of coarse Y-Al-O particles. Our work demonstrates that substituting Y2 O3 with Y2 Ti2 O7 is an effective route to improve the corrosion resistance of Al-adding ODS steels.