Enhancement of high temperature steam oxidation resistance of Zr–1Nb alloy with ZrO2/Cr bilayer coating. (15th July 2021)

• Record Type: Journal Article
• Authors: Wang, Xingping; Guan, Haohao; Liao, Yizhao; Zhu, Minghao; Xu, Chi; Jin, Xiaoyue; Liao, Bin; Xue, Wenbin; Zhang, Yanwei; Bai, Guanghai; Wang, Rongshan
• Is Part Of: Corrosion science. Volume 187(2021)
• Publication Date: 2021-07-15
• Subjects: ZrO2/Cr bilayer coating -- High-temperature steam oxidation -- Zr–1Nb alloy -- Plasma electrolytic oxidation -- Filtered cathodic vacuum arc deposition; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109494
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: A ZrO2 /Cr bilayer coating on Zr–1Nb alloy was fabricated by PEO and FCVAD duplex treatments. Steam oxidation resistance of Zr–1Nb below 1100 °C was significantly improved by ZrO2 /Cr coating. M -ZrO2 to Zr3 O transformation in PEO layer for ZrO2 /Cr-coated alloy took place during steam oxidation. Abstract: The ZrO2 /Cr bilayer coating on Zr–1Nb alloy fabricated by plasma electrolytic oxidation and filtered cathodic vacuum arc deposition duplex treatments had good steam oxidation resistance. The mass gain of ZrO2 /Cr-coated alloy was about 36 %, 44 % and 59 % of that of Cr-coated one after 3600 s steam oxidation at 900 °C, 1000 °C and 1100 °C, respectively. The top Cr layer for Cr-coated and ZrO2 /Cr-coated alloys was oxidized into a Cr2 O3 layer, and then a part of Cr2 O3 was reduced by Zr to form metallic Cr layer again after the as-prepared Cr layer was completely consumed.