锆合金中的氢对其在400℃过热蒸汽中耐腐蚀性能的影响

Effect of Hydrogen in Zirconium Alloys on Their Corrosion Resistance in Superheated Steam at 400 ℃

对Zr-4、C7、SZA-1、SZA-4、SZA-5和SZA-6锆合金试样进行了气相渗氢并达到了60～260μg/g的氢含量。通过高压釜腐蚀试验研究了锆合金中的氢对以上6种锆合金试样在400℃、10. 3 MPa压力的过热蒸汽中耐腐蚀性能的影响。用扫描电镜观察试样氧化膜的显微组织。结果表明,6种锆合金渗氢试样在400℃、10. 3 MPa压力的过热蒸汽中腐蚀后,渗氢和未渗氢试样的腐蚀增重和氧化膜显微组织没有明显差别,含量低于260μg/g的氢对Zr-4、C7、SZA-1、SZA-4、SZA-5和SZA-6锆合金在400℃、10. 3 MPa压力的过热蒸汽中耐腐蚀性能的影响不大。

Zr-4,C7,SZA-1,SZA-4,SZA-5 and SZA-6 zirconium alloy specimens were impregnated with hydrogen in a gaseous medium to hydrogen contents of 60 to 260μg/g.The effect of hydrogen in zirconium alloys on their corrosion resistance was investigated by corrosion tests in superheated steam at temperature of 400℃and pressure of 10.3 MPa in a high-pressure autoclave.The microstructure of oxide film on the specimens was observed by SEM.The results showed that no obvious differences in the corrosion weight gains and in the microstructures of the oxide film were observed for the hydrogen-impregnated and un-impregnated specimens after being corroded in the superheated steam at temperature of 400℃and pressure of 10.3 MPa,and that the hydrogen content less than 260μg/g in the zirconium alloys had a little effect on their corrosion resistance in the superheated steam at the temperature and pressure stated above.