摘要
采用增重法在1100℃、1150℃和1200℃条件下对Fe-21Cr-11Ni试验钢进行循环氧化试验,结合X射线衍射、扫描电镜及能谱等方法研究了钇元素在耐热钢抗高温氧化中的作用机理。结果显示,添加微量稀土钇元素能显著提高耐热钢的抗高温氧化性能。在氧化过程中,钇元素能促进铬元素向氧化层的扩散,在含钇耐热钢表面,形成了致密的粘附性好的Cr2O3层和FeCr2O4尖晶石外氧化物层,起到了很好的保护作用,在内氧化层中,钇元素不仅加强了SiO2钉扎,而且直接参与和强化了钉扎作用。
The cyclic oxidation tests of heat resistant steel Fe-21Cr-11Ni were carried out at 1 100 ℃,1 150 ℃ and 1 200 ℃ by using weight gain method.The influence of yttrium on the oxidation resistance of the heat resistant steel was examined by XRD,SEM and EDX.The results showed that the oxidation resistance of the heat resistant steel was improved remarkably after adding yttrium.During oxidation process the diffusion of chromium to the scale could be promoted by yttrium.On the surface of the heat resistant steel containing yttrium,the dense and adherent Cr2O3 scale and FeCr2O4 scale were formed and played the protection role.In the internal oxidation layer,the pinning effect of silicon dioxide was strengthened by yttrium,and yttrium had a pining effect directly.
出处
《腐蚀与防护》
CAS
北大核心
2010年第10期769-771,822,共4页
Corrosion & Protection
关键词
钇
耐热钢
抗高温氧化
稀土
yttrium
heat resistant steel
high temperature oxidation resistance
rare earth
