粘结剂成分对Ti(C,N)基金属陶瓷腐蚀行为的影响  

Effect of Binder Composition on Corrosion Behavior of Ti(C,N)-Based Cermets

作　　者：杨青青[1] 熊惟皓[1] 黄斌[1] 陈珊[1] Yang Qingqing;Xiong Weihao;Huang Bin;Chen Shan(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《稀有金属材料与工程》2022年第11期4166-4172,共7页Rare Metal Materials and Engineering

基　　金：湖北省技术创新专项重大项目(2016AAA067);华中科技大学实验技术项目(2020012)。

摘　　要：研究了含质量分数为38%Ni或Ni-20Cr粘结剂的2种Ti(C,N)基金属陶瓷在0.2 mol/L H_(2)SO_(4)和0.2 mol/L NaOH溶液中的室温腐蚀行为。在0.2 mol/L H_(2)SO_(4)溶液中,2种金属陶瓷的腐蚀行为和耐蚀性存在一些明显的差异:与以Ni作粘结剂的金属陶瓷不同,以Ni-20Cr作粘结剂的金属陶瓷浸泡过程中表面自发生成NiO、Ni(OH)x(SO4)y、Cr_(2)O_(3)和Cr(OH)_(3),致使粘结相溶解十分缓慢;动电位极化过程中不发生钝化,伪钝化后电流密度增加较快。在0.2 mol/L NaOH溶液中,2种金属陶瓷的腐蚀行为和耐蚀性无明显差异:浸泡过程中陶瓷晶粒溶解十分缓慢,同时生成NiOOH和Cr6+化合物;动电位极化过程中不发生钝化,但发生伪钝化。Corrosion behavior of two Ti(C,N)-based cermets with 38wt%Ni or Ni-20Cr binder was investigated in 0.2 mol/L H_(2)SO_(4)and 0.2 mol/L NaOH solutions at room temperature.In 0.2 mol/L H_(2)SO_(4)solution,there are significant differences in corrosion behavior and resistance between both cermets.For cermet with Ni-20Cr binder,binder phase is very slowly dissolved during immersion,mainly due to that the spontaneous formations of NiO,Ni(OH)x(SO4)y,Cr_(2)O_(3)and Cr(OH)_(3),and no passivation occurs and current density rapidly increases beyond the pseudo-passive region during potentiodynamic polarization,differing from cermet with Ni binder.By contrast,in 0.2 mol/L NaOH solution,there are no significant differences in corrosion behavior and resistance between both cermets.Ceramic grains are very slowly dissolved during immersion,accompanied by the formations of NiOOH and Cr6+compound,and no passivation but pseudo-passivation occurs during potentiodynamic polarization.

关 键 词：TI(C N)基金属陶瓷 金属粘结剂 腐蚀行为 XPS 

分 类 号：TG148[一般工业技术—材料科学与工程]