摘要
通过高压釜腐蚀实验研究了添加微量S对Zr-0.70Sn-0.35Nb-0.30Fe(质量分数,%)合金在360℃/18.6 MPa/0.01 mol/L LiOH水溶液中耐腐蚀性能的影响.利用透射电子显微镜(transmission electron microscope,TEM)和扫描电子显微镜(scanning electron microscope,SEM)观察和分析了合金及腐蚀后氧化膜的显微组织.结果表明:在Zr-0.70Sn-0.35Nb-0.30Fe合金中添加5～570μg/g的S后,合金的耐腐蚀性能下降,且随着S含量的增加恶化趋势显著.S的表面偏聚、尺寸较大的Zr9S2和Zr3Fe第二相的析出,加速了氧化膜中缺陷扩散凝聚形成孔隙和微裂纹的演化过程,导致Zr-0.70Sn-0.35Nb-0.30Fe-x S合金的耐腐蚀性能较差.
The effect of adding dilute S on the corrosion resistance of Zr-0.70Sn-0.35Nb- 0.30Fe alloy was investigated in lithiated water with 0.01 mol/L LiOH at 360℃/18.6 MPa by autoclave tests. The microstruetures of the alloys and the oxide layers formed on the alloys were investigated by transmission electron microscope （TEM） and scanning electron microscope （SEM）. Results showed that adding 5-570 μg/g S degraded the corrosion resistance of Zr-0.70Sn-0.35Nb-0.30Fe alloy and the higher the S content was, the worse corrosion resistance was. Surface segregation of S and the precipitation of coarse Zr9S2 and Zr3Fe second phase particles accelerated the evolution of pores and micro-cracks formed by diffusion of defects in oxide layer, which leads to the bad corrosion resistance of Zr-0.70Sn- 0.35Nb-0.30Fe-S alloy.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第2期160-169,共10页
Journal of Shanghai University:Natural Science Edition
基金
国家自然科学基金资助项目(51171102)
关键词
锆合金
硫
耐腐蚀性能
显微组织
zirconium alloy
sulphur
corrosion resistance
microstructure
