α钛合金(Ti-Al-Zr)在360℃水,400℃蒸汽条件下的静水腐蚀行为

Uniform Corrosion Resistance of α Titanium (Ti-Al-Zr) Alloy in 360℃ Water and 400℃ Steam

研究了α钛合金 (Ti- Al- Zr)在 36 0℃ ,18.6 MPa水和 40 0℃ ,10 .3MPa水蒸汽中的静水腐蚀行为 ,腐蚀时间累计分别达到 2 2 1d和 2 13d.利用扫描电镜和 X-射线衍射技术观察并分析了α钛合金氧化膜的形貌及物相组成 .结果表明 :α钛合金在高压水和蒸汽中的腐蚀动力学曲线上均出现了三个阶段 .在腐蚀的第一阶段 ,腐蚀增重随腐蚀时间增加而缓慢增加 ;在第二阶段 ,腐蚀增重突然增大 ;到第三阶段 ,腐蚀增重变化不大 .α钛合金的氧化膜主要由两种不同的 Ti O2 组成 :金红石和锐钛矿 .随着腐蚀时间的延长 ,氧化膜中锐钛矿的相对含量逐渐增加 .

The uniform corrosion properties of α titanium alloy(Ti Al Zr) were investigated. Corrosion tests were performed in 360 ℃ water and 400 ℃ steam for a total of 221 days and 213 days respectively. The tested alloy in two different mediums showed special corrosion behavior with three stages. In stage Ⅰ, corrosion rate of α Ti alloy increased gradually with increasing corrosion time. Then corrosion rate increased greatly in stage Ⅱ and finally reached almost a constant in stage Ⅲ. X ray diffraction analysis shows that the major phase of the oxide film of α Ti alloy is two different TiO 2, i.e., rutile and anatase. The amount of anatase increases with increasing time.