摘要
采用静态高压釜腐蚀实验研究添加微量Pd元素的Zr-4合金在(360℃,18.6 MPa)条件下0.01 mol/L Li OH水溶液中的耐腐蚀性能,采用TEM和SEM研究合金和氧化膜的显微组织。结果表明:添加0.05%~0.2%Pd(质量分数)均可明显改善Zr-4合金在Li OH水溶液中的耐腐蚀性能,其中添加0.1%Pd时改善作用最显著,随着添加Pd含量的进一步增加,对Zr-4合金耐腐蚀性能的改善作用减弱。在Zr-4合金中Pd元素以Zr2(Fe,Cr,Pd)、Zr2(Pd,Fe)形式的第二相析出,其中Zr2(Pd,Fe)第二相尺寸较大。固溶在α-Zr中的Pd和尺寸较小的Zr2(Fe,Cr,Pd)型第二相可以提高Zr-4合金的耐腐蚀性能;析出尺寸较大的Zr2(Pd,Fe)第二相后会对Zr-4合金的耐腐蚀性能产生不利的影响。
The corrosion resistance of Zr-4 alloy with Pd addition in 0.01 mol/L LiOH solution at 360 ℃ and 18.6 MPa was studied by autoclave test. The microstructures of the alloys and oxide layers were investigated by TEM and SEM. The results show that the corrosion resistance of Zr-4 alloy in LiOH solution is markedly improved with the addition of 0.05%-0.2% Pd. And the Zr-4 alloy with the addition of 0.1%Pd shows the best corrosion resistance. The role of improving the corrosion resistance of Zr-4 alloy weakens when the Pd content further increases. The alloying element of Pd is precipitated as the second phase particles(SPPs) of Zr2(Fe,Cr,Pd) and Zr2(Pd,Fe) in Zr-4 alloys. The SPPs of Zr2(Pd,Fe) are comparably coarse. The solid solution of Pd in α-Zr matrix and the precipitates of fine SPPs of Zr2(Fe,Cr,Pd) are beneficial to improve the corrosion resistance of Zr-4 alloy, while the coarse SPPs of Zr2(Pd,Fe) are harmful to the corrosion resistance.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2015年第3期675-681,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51171102)
