Ge含量对Zr-4合金在LiOH水溶液中耐腐蚀性能的影响  

Effect of Ge addition on corrosion performance of Zr-4 alloy in lithiated solution

作　　者：张金龙[1,2] 谢兴飞[1,2] 姚美意[1,2] 周邦新[1,2] 彭剑超[1,2] 李强[1,2] 

机构地区：[1]上海大学微结构重点实验室,上海200444 [2]上海大学材料研究所,上海200072

出　　处：《中国有色金属学报》2013年第6期1542-1548,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50971084;51171102);大型先进压水堆核电站重大专项资助项目(2011ZX06004-023)

摘　　要：采用堆外高压釜腐蚀试验研究添加0.1%Ge和0.5%Ge(质量分数)对Zr-4合金在360℃、0.01 mol/L LiOH水溶液中耐腐蚀性能的影响,用TEM和EDS研究合金的显微组织和第二相成分。结果表明:与Zr-4合金相比,添加Ge后合金的耐腐蚀性能显著提高,但随着Ge添加量的增加,对耐腐蚀性能的提高作用减弱。当Ge含量为0.1%时,析出密排六方结构的Zr(Fe,Cr)2和Zr(Fe,Cr,Ge)2型第二相;当Ge含量达到0.5%时,还会析出Zr-Sn-Fe-Cr-Ge和尺寸较大的四方结构Zr3Ge型第二相,添加Ge会使α-Zr基体中固溶的Sn含量降低。固溶在α-Zr中的Ge和尺寸较小的Zr(Fe,Cr)2、Zr(Fe,Cr,Ge)2型第二相可以提高Zr-4+xGe合金的耐腐蚀性能;析出Zr-Sn-Fe-Cr-Ge和尺寸较大的Zr3Ge第二相后会对耐腐蚀性能产生不利的影响。In order to investigate the effect of Ge addition on the corrosion resistance of zircaloy-4（Zr-4） alloy,the corrosion performance of Zr-4＋xGe（x= 0.1%,0.5%,mass fraction） was studied in lithiated solution with 0.01 mol/L LiOH at 360 ℃ by out reactor autoclave testing.The microstructures of the alloys and the compositions of the second phase particles（SPPs） were investigated by TEM and EDS.The results show that compared with Zr-4 alloy,the corrosion resistances of Zr-4＋xGe alloys containing 0.1% and 0.5% Ge are markedly improved,while the corrosion resistances decrease slightly with the increase of Ge addition.The addition of Ge decreases the solid solution content of Sn in the α-Zr matrix.When the Ge content is 0.1%,the second phase particles precipitate as Zr（Fe,Cr）2 and Zr（Fe,Cr,Ge）2 in Zr-4＋xGe alloy.When the Ge content reaches 0.5%,a part of Ge precipitates as Zr-Sn-Fe-Cr-Ge or Zr3Ge SPPs.The solid solution of Ge in the α-Zr matrix and small SPPs of Zr（Fe,Cr）2 and Zr（Fe,Cr,Ge）2 are beneficial to the corrosion resistance of Zr-4＋xGe alloy,while the corrosion resistance decreases due to the precipitation of Zr-Sn-Fe-Cr-Ge and SPPs of Zr3Ge with large size.

关 键 词：ZR-4合金 Ge 耐腐蚀性能 显微组织 

分 类 号：TG146.4[一般工业技术—材料科学与工程]