In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 29, No. 21 ( 2014-11-14), p. 2596-2603
Abstract:
New-type Ni-based superalloys with and without Nb were designed in this study. Their hot corrosion behaviors were investigated at 800 °C with the deposition of a mixture of Na 2 SO 4 and NaCl. The corrosion kinetics was studied by thermogravimetry. Microstructure of the corrosion scales was studied by SEM and the phase constituent was analyzed by XRD. Results showed that the corrosion kinetics followed approximately parabolic law. The corrosion scales on the two Ni-based alloys were comprised of Cr 2 O 3 , Al 2 O 3 , TiO 2 , and NiCr 2 O 4 . NiO was only detected in the scale on alloy without Nb. Nb 2 O 5 appeared with the addition of 2.0 wt% Nb. No sulfide emerged in the scales. The corrosion scales both exhibited a layered structure. With Nb addition, the hot corrosion resistance of the alloy was notably improved. The action mechanism of Nb was investigated extensively in this study.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/jmr.2014.282
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2014
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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