B10白铜晶界特征分布对耐腐蚀性能的影响  

Effect of grain boundary characteristic distribution on corrosion resistence performance of B10 cupronickel

作　　者：姜涛[1] 付少利 董健龙 JIANG Tao;FU Shaoli;DONG Jianlong(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《有色金属材料与工程》2023年第1期15-23,共9页Nonferrous Metal Materials and Engineering

基　　金：上海市高性能医疗器械材料工程中心资助项目(20DZ2255500)。

摘　　要：B10白铜(Cu-Ni合金)管材作为一种船舶常用的管道用材料,耐腐蚀性一直是困扰其被广泛应用的一大原因。以4种不同的B10白铜管材为试验样品,采用电子背散射衍射及电化学腐蚀试验研究了B10白铜晶界特征分布及其对腐蚀性能的影响。结果表明:低重位点阵(coincidence site lattice,CSL)晶界比例越高,其耐腐蚀性能越强,特别是低CSL∑3^(n)(n=1,2,3)晶界的大量存在,降低了普通晶界的网络连通性,阻碍了腐蚀沿晶界的扩展,提高了B10白铜对海水的耐腐蚀性。当样品B中∑3^(n)晶界的长度为47.07%时,其腐蚀电势为-0.289 V、腐蚀电流密度为3.341×10^(-6)A/cm^(2)、腐蚀膜阻抗为33.102Ω/cm^(2)、腐蚀膜厚度为17.5μm。B10 cupronickel(Cu-Ni alloy)pipe is used as a kind of common pipe material for ships,and its corrosion resistance is a major reason for its wide application.Taking four different kinds of B10 cupronickel pipe as test samples,electron backscattered diffraction and electrochemical corrosion test were used to study the grain boundary characteristic distribution of B10 cupronickel and its effect on corrosion performance.The results show that the proportion of low coincidence site lattice(CSL)grain boundaries is higher,and the corrosion resistance is stronger.Especially,the abundant existence of low CSL ∑3^(n)(n=1,2,3)grain boundary reduces the network connectivity of common grain boundaries,hinders the expansion of corrosion along grain boundaries,and improves the corrosion resistance of B10 cupronickel to seawater.When the length of ∑3^(n)grain boundary reaches 47.07% in the sample B,the corrosion potential is-0.289 V,the corrosion current density is 3.341×10^(-6)A/cm^(2),the corrosion film resistance is 33.102Ω/cm^(2),and the corrosion film thickness is 17.5μm.

关 键 词：B10白铜管材 晶界特征分布 电化学腐蚀 静态腐蚀 

分 类 号：TG146[一般工业技术—材料科学与工程]