STUDY ON THE CORROSION RESISTANCE OF Zr–0.7Sn–0.35Nb–0.3Fe–xGe ALLOY IN LITHIATEDWATER AT HIGH TEMPERATURE UNDER HIGH PRESSURE
Received date: 2012-07-19
Revised date: 2012-09-18
Online published: 2012-12-11
Supported by
Supported by National Natural Science Foundation of China (No.50971084) and National Advanced Pressurized Water Reactor Project of China (No.2011ZX06004–023)
The corrosion resistance of Zr–0.7Sn–0.35Nb–0.3Fe–xGe (x=0.05, 0.1, 0.2, mass fraction, %) alloys was investigated in lithiated water with 0.01 mol/L LiOH at 360 /18.6 MPa by autoclave tests. The microstructures of the alloys and oxide films on the corroded specimens were observed by TEM and SEM. The results show that the corrosion resistance of the Zr–0.7Sn–0.35Nb–0.3Fe alloys in lithiated water at high temperature under high pressure is markedly improved by Ge addition. The alloy with 0.1%Ge shows the best corrosion resistance. In Zr–0.7Sn–0.35Nb–0.3Fe–xGe alloys, there exists fine Zr(Fe, Cr, Nb)2 and Zr(Fe, Cr, Nb, Ge)2 second phase particles (SPPs) with a close–packed hexagonal crystal structure (hcp) and coarse Zr3Ge SPPs with a tetragonal crystal structure (TET). The oxide films formed on the Zr–0.7Sn–0.35Nb–0.3Fe–0.1Ge alloys corroded for 220 d are compact and thin. The micro–pores and micro–cracks are hardly detected and many ZrO2 columnar grains exist in the oxide films formed on the Zr–0.7Sn–0.35Nb–0.3Fe–0.1Ge alloys. This indicates that the suitable amount of Ge could not only delay the process that the vacancies diffuse to form micro–pores and micro–pores develop to form micro–cracks, but also could retard the evolution from ZrO2 columnar grains to ZrO2 equiaxed grains.
Key words： zirconium alloy; Ge; corrosion resistance; microstructure; oxide film
XIE Xingfei ZHANG Jinlong ZHU Li YAO Meiyi ZHOU Bangxin PENG Jianchao . STUDY ON THE CORROSION RESISTANCE OF Zr–0.7Sn–0.35Nb–0.3Fe–xGe ALLOY IN LITHIATEDWATER AT HIGH TEMPERATURE UNDER HIGH PRESSURE[J]. Acta Metall Sin, 2012 , 48(12) : 1487 -1494 . DOI: 10.3724/SP.J.1037.2012.00434
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