期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 767, 期 -, 页码 7-15出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.059
关键词
Nb alloy; Multilayer coating; Pack cementation; Microarc oxidation; Hot corrosion
资金
- NSFC [51571077, 51371071, 51621091]
- National Basic Science Research Program [2012CB933900]
- Fundamental Research Funds for the Central Universities [HIT.BRETIII.201202]
- program for New Century Excellent Talents in University of China [NCET-08-0166]
A NbSi2/SiO2-Nb2O5 multilayer coating, consisting of a NbSi2 inner layer and a SiO2-Nb2O5 outer layer, was prepared on Nb alloy through halide activated pack cementation (HAPC) and microarc oxidation (MAO). The hot corrosion behaviors of the single NbSi2 coated and the NbSi2/SiO2-Nb2O5 coated Nb alloys were comparatively investigated with a mixture of Na2SO4/NaCl (3:1 wt.%) salt at 900 degrees C. The growth kinetics of the corroded scales follow the parabolic laws, and the parabolic rate constants of the NbSi2 coated and the NbSi2/SiO2-Nb2O5 coated specimens were 2.16 x 10(-3) mms(-2) and 1.04 x 10(-3) mms(-2), respectively. During the corroding process, the SiO2-Nb2O5 outer layer that serves as a barrier promotes the formation of continuous SiO2 scale, and isolates the NbSi2 layer from the corrosion salt. The lower corrosion rate of the NbSi2/SiO2-Nb2O5 coated specimens is attributed to the formation of the protective SiO2 corroded scale. (C) 2018 Elsevier B.V. All rights reserved.
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