TY - JOUR
T1 - The effect of α-Zr matrix microstructure on the formation of oxide film and the corrosion resistance of new zirconium alloys
AU - Zhang, Hai Xia
AU - Li, Zhong Kui
AU - Xu, Bing She
AU - Wang, Yong Zhen
AU - Zhou, Lian
PY - 2014
Y1 - 2014
N2 - The corrosion kinetics of NZ2 and NZ8 alloys were investigated by static autoclave test in 400°C/ 10.3 MPa steam; the matrix microstructures of the two alloys were tested by TEM and neutron diffraction method. The crystal structure of oxide films of NZ2 and NZ8 alloys after corroded was investigated by XRD and Raman spectra methods in this paper. The results of corrosion kinetics indicated that the corrosion resistance of NZ2 alloy in 400°C/10.3 MPa steam was better than that of NZ8 alloy; TEM studies on the matrixes showed that the precipitates of NZ2 were Zr(Fe, Cr)2 and Zr(Fe, Cr, Nb)2, and Nb content in the matrix was less than solid solution limit. However, the precipitates of NZ8 were Zr-Fe-Nb, and Nb was supersaturated in the matrix. The neutron diffraction result confirmed that the Zr(Fe, Cr)2 precipitates of NZ2 matrix were C14 structure. A great deal of Zr-Fe-Nb precipitates and the supersaturated Nb content in NZ8 matrix increased the local volume expansion and accelerated the crack formation, which resulted in the higher corrosion rate of NZ8.Moreover, the less than solid solution Nb content in the matrix and Zr(Fe, Cr)2, Zr(Fe, Cr, Nb)2 precipitates improved the corrosion resistance of NZ2 alloy.
AB - The corrosion kinetics of NZ2 and NZ8 alloys were investigated by static autoclave test in 400°C/ 10.3 MPa steam; the matrix microstructures of the two alloys were tested by TEM and neutron diffraction method. The crystal structure of oxide films of NZ2 and NZ8 alloys after corroded was investigated by XRD and Raman spectra methods in this paper. The results of corrosion kinetics indicated that the corrosion resistance of NZ2 alloy in 400°C/10.3 MPa steam was better than that of NZ8 alloy; TEM studies on the matrixes showed that the precipitates of NZ2 were Zr(Fe, Cr)2 and Zr(Fe, Cr, Nb)2, and Nb content in the matrix was less than solid solution limit. However, the precipitates of NZ8 were Zr-Fe-Nb, and Nb was supersaturated in the matrix. The neutron diffraction result confirmed that the Zr(Fe, Cr)2 precipitates of NZ2 matrix were C14 structure. A great deal of Zr-Fe-Nb precipitates and the supersaturated Nb content in NZ8 matrix increased the local volume expansion and accelerated the crack formation, which resulted in the higher corrosion rate of NZ8.Moreover, the less than solid solution Nb content in the matrix and Zr(Fe, Cr)2, Zr(Fe, Cr, Nb)2 precipitates improved the corrosion resistance of NZ2 alloy.
KW - Corrosion resistance
KW - Nb content
KW - Oxide film
KW - Precipitate
KW - α-Zr matrix
UR - http://www.scopus.com/inward/record.url?scp=84902094773&partnerID=8YFLogxK
U2 - 10.3969/j.issn.1001-9731.2014.08.013
DO - 10.3969/j.issn.1001-9731.2014.08.013
M3 - 文章
AN - SCOPUS:84902094773
SN - 1001-9731
VL - 45
SP - 8062
EP - 8066
JO - Gongneng Cailiao/Journal of Functional Materials
JF - Gongneng Cailiao/Journal of Functional Materials
IS - 8
ER -