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SZA-6(Zr-(0.35~0.65)Sn-(0.35~0.65)Nb-(0.15~0.45)Fe-(0.01~0.02)Si)合金经β相区水淬后经500和580℃保温5~50 h,通过静态高压釜腐蚀实验研究样品在400℃、10.3 MPa过热蒸汽和360℃、18.6 MPa、0.01 mol/L LiOH水溶液中的腐蚀行为。并利用SEM、TEM和EDS研究合金的显微组织,包括第二相的尺寸、分布与种类。结果表明:经500℃退火处理的样品发生部分再结晶,经580℃退火处理的样品发生完全再结晶,退火时间对第二相尺寸的影响也不明显,退火时间对第二相尺寸的影响不明显;合金中的第二相主要是密排六方的Zr(Nb,Fe,Cr)_2、四方的Zr_5Si_4以及正交的Zr_3Fe;SZA-6合金在400℃、10.3 MPa过热蒸汽与360℃、18.6 MPa、0.01 mol/L LiOH水溶液中的耐腐蚀性能均随着退火温度的升高而变差,退火时间对SZA-6合金的耐腐蚀性能影响不大。
SZA-6 (0.35 ~ 0.65) Sn- (0.35 ~ 0.65) Nb- (0.15 ~ 0.45) Fe- (0.01 ~ 0.02) Si) The corrosion behavior of the samples in 400 ℃, 10.3 MPa superheated steam and 360 ℃, 18.6 MPa, 0.01 mol / L LiOH aqueous solution was investigated by static autoclave corrosion test. SEM, TEM and EDS were used to study the microstructure of the alloy, including the size, distribution and type of the second phase. The results show that the samples annealed at 500 ℃ have partially recrystallized and the samples annealed at 580 ℃ have been completely recrystallized. The effect of annealing time on the size of the second phase is not obvious. The effect of annealing time on the size of the second phase is not affected (Zr, Nb, Fe, Cr) _2, tetragonal Zr_5Si_4 and Zr_3Fe orthorhombic; the SZA-6 alloy at 400 ℃, 10.3 MPa superheated steam and 360 ℃, 18.6 MPa, the corrosion resistance of 0.01 mol / L LiOH aqueous solution all decreases with the increase of annealing temperature, and the annealing time has little effect on the corrosion resistance of SZA-6 alloy.