摘要
采用高温熔盐灼烧法研究 T2钛合金高温腐蚀动力学及腐蚀行为。分别在 5 0 0 ,6 0 0 ,70 0 ,80 0℃的 Na2 SO4 或Na2 SO4 (80 % ) +Na Cl (2 0 % )环境中发现 T2钛合金腐蚀增重符合直线规律 ,直线通式为 y =KLt。随着温度的增加 ,直线的速率常数 KL增大。混合盐 Na2 SO4 (80 % ) +Na Cl(2 0 % )比纯Na2 SO4 的加速腐蚀作用更加明显。在 Na2 SO4 或Na2 SO4 (80 % ) +Na Cl (2 0 % )中 ,T2钛合金随温度升高 ,氧化膜的完整性降低。合金中 Al,Zr等元素在腐蚀中向合金表面扩散 ,而盐中的 S。
High temperature corrosion kinetics and corrosion behavior of T2 titanium alloy were studied by oxidizing in melting salt. At 500, 600, 700°C and 800°C, the relationships of the corrosion weight change of T2 titanium alloys with time were both coincident with linear law in Na2SO4 and Na2SO4(80%) + NaCl(20%). The common linear function was y = KLt, in which constant KL increased with higher temperature. Corrosion in Na2SO4(80%) + NaCl(20%) was more serious than that in Na2SO4 at the same temperature. In Na2SO4 and Na2SO4(80%) + NaCl(20%), the integrality of oxide film decreased when corrosion temperature for T2 increased. During high temperature corrosion, Al and Zr diffused to the surface of alloy and S and Cl diffused into alloy.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2004年第10期3-6,11,共5页
Journal of Materials Engineering
关键词
钛合金
高温腐蚀
动力学
titanium alloy
high temperature corrosion
kinetics
