摘要
在不同水化学条件下,对Zr-4和N18管状样品进行腐蚀实验,然后用氧化膜卷曲法测量腐蚀样品氧化膜中的压应力,研究腐蚀温度、水化学对氧化膜中压应力随厚度变化的影响规律.实验结果表明,Zr-4和N18样品氧化膜中的压应力均按360℃去离子水>400℃过热蒸汽>360℃L iOH水溶液的顺序依次减小.在360℃L iOH水溶液中腐蚀时,氧化膜中的压应力最低,这与L i+和OH-会渗入氧化膜,降低氧化锆表面自由能,从而加速氧化膜中空位的扩散凝聚、孔隙的形成和微裂纹发展的过程有关.高温使空位的扩散加快,促进了氧化膜中压应力的弛豫过程.
To investigate the effect of corrosion temperature and water chemistry on compressive stress with the increase of oxide film thickness,Zr-4 and N18 tubular specimens were corroded in three kinds of water chemistry.Compressive stress of oxide films formed on the outside of the tubular specimens was measured with a curling method of oxide film.Experimental results indicate that compressive stress in oxide films decreases in the sequence of 360 ℃ deionized water 400 ℃ super-heated steam 360 ℃ lithiated water.Li＋ and OH-ions incorporated into the oxide films decrease the surface free energy of oxide.As a result,the diffusion of vacancies,formation of pores and development of micro-cracks are enhanced.This is the reason why compressive stress of oxide films formed in 360 ℃ lithiated water is the lowest.Diffusion of vacancies is promoted at higher temperature,resulting in relaxation of compressive stress in oxide films.Therefore compressive stress of oxide films formed in 400 ℃ super-heated steam is lower than that formed in 360 ℃ deionized water.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第3期293-296,共4页
Journal of Shanghai University:Natural Science Edition
基金
国防科技重点实验室基金资助项目(9140C7004010803)
上海市重点学科建设资助项目(S30107)
关键词
锆合金
耐腐蚀性能
氧化膜
压应力
zirconium alloys
corrosion resistance
oxide film
compressive stress
