Nb含量对锆合金腐蚀吸氢的影响  

Effect of Nb content on corrosion hydrogen absorption ofzirconium alloys

作　　者：黄娇 潘晋廷 陈纪丹 王全伟 李志康 姚美意[2] 樊立峰[1] HUANG Jiao;PAN Jinting;CHEN Jidan;WANG Quanwei;LI Zhikang;YAO Meiyi;FAN Lifeng(Key Laboratory of Thin Film and Coatings Technology,Inner Mongolia University of Technology,Hohhot 010051,China;Material Institution,Shanghai University,Shanghai 200072,China)

机构地区：[1]内蒙古工业大学薄膜与涂层重点实验室,呼和浩特010051 [2]上海大学材料研究所,上海200072

出　　处：《中国有色金属学报》2025年第2期586-596,共11页The Chinese Journal of Nonferrous Metals

基　　金：内蒙古自治区直属高校基本科研业务费资助项目(JY20220279);内蒙古自治区自然科学基金青年基金资助项目(2020BS05011)。

摘　　要：锆合金是水冷核动力堆用关键结构材料,其在服役环境中的腐蚀和吸氢对核反应堆的安全性至关重要。本实验选用Zr-0.75Sn-0.35Fe-0.15Cr合金,分别添加质量分数为0~1.0%Nb,研究Nb含量对锆合金在360℃、18.6 MPa去离子水溶液中的腐蚀吸氢行为。结果表明:在腐蚀初期,Zr-0.75Sn-0.35Fe-0.15CrxNb合金的吸氢分数为71.8%~88.9%;腐蚀580 d后,合金样品的吸氢分数为15%~24.8%,氧化膜具有阻挡氢扩散的能力,添加Nb增强了氧化膜的阻氢能力。样品中氢化锆为面心立方结构的δ相,α-Zr和δ相氢化锆的取向关系为[100]_(α-Zr)//[110]_(δ-ZrH)。(001)_(α-Zr)//(111)_(δ-ZrH)。添加Nb可以抑制SN面氢化锆的团聚,减小S_(T)面聚集生长的氢化锆条带的尺寸,进而改善因氢化锆偏聚造成的局部氢浓度过高的情况,这有利于氢化锆在腐蚀温度下的溶解,从而提高锆合金的耐腐蚀性能。Zirconium alloys are key structural materials used in water-cooled nuclear power reactors,and their corrosion and hydrogen absorption in the service environment are crucial to the safety of nuclear reactors.The Zr-0.75Sn-0.35Fe-0.15Cr alloy was selected,with the addition of Nb at mass fractions ranging from 0 to 1.0%,to study effects of Nb content on the corrosion and hydrogen absorption behavior of zirconium alloys in deionized water at 360°C and 18.6 MPa.The results shows that the hydrogen absorption fraction of Zr-0.75Sn-0.35Fe-0.15Cr-xNb alloys ranges from 71.8%to 88.9%at the initial stage of corrosion.After 580 days of corrosion,the hydrogen absorption fraction of the experimental alloys ranges from 15%to 24.8%.It indicates that the oxide film can block hydrogen diffusion and Nb addition enhance the hydrogen inhibition ability of the oxide film.The detected zirconium hydride in the samples is identified as theδphase with a face-centered cubic structure.The orientation relationship betweenα-Zr and_(δ-ZrH) is[100]_(α-Zr)//[110]_(δ-ZrH),(001)α-Zr//(111)_(δ-ZrH).The addition of Nb inhibits the agglomeration of zirconium hydride on the SN plane and reduces the size of zirconium hydride bands grown on the S_(T) plane,thereby improving the localized high hydrogen concentration caused by zirconium hydride segregation.This facilitates the dissolution of zirconium hydride at corrosion temperatures,ultimately enhancing the corrosion resistance of the zirconium alloy.

关 键 词：锆合金 Nb元素 吸氢 腐蚀 

分 类 号：TG146.4[一般工业技术—材料科学与工程]