Electrodeposition of Mo/Re duplex layer and preparation of MoSi2/ReSi2/NbSi2 compound coating on Nb-Ti-Si based alloy. (June 2019)

• Record Type: Journal Article
• Authors: Yue, Gao; Guo, Xiping; Qiao, Yanqiang; Zhou, Chungen
• Is Part Of: Corrosion science. Volume 153(2019)
• Page Start: 283
• Page End: 291
• Publication Date: 2019-06
• Subjects: A. Intermetallics -- A. Metal coatings -- C. Electrodeposited films -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.03.053
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Mo/Re duplex layer is electrodeposited on the Nb-Ti-Si based alloy. The Re layer can improve the electrodeposition of Mo. Porous structure of MoSi2 is due to the oxides in the as-deposited Mo layer. The MoSi2 /ReSi2 /NbSi2 compound coating shows perfect protection for the substrate. Abstract: MoSi2 /ReSi2 /NbSi2 compound coating has been successfully prepared on the Nb-Ti-Si based alloy through electrodeposition and halide activated pack cementation (HAPC) process. Optimization of electrodeposition process, the microstructural evolution and oxidation resistance of the compound coating were investigated. Re is beneficial to the electrodeposition of Mo and then improves the integrity and adherence of MoSi2 layer. The porous structure and limited thickness expansion of MoSi2 layer should be attributed to the oxides in the electrodeposited molybdenum layer. Remarkably, the substrate could be effectively protected by the compound coating at 1150 °C due to the formation of a dense scale.