高温水中不同Fe含量Ni-Cr-Fe合金的氧化膜特性

Oxide Film Properties of Ni-Cr-Fe Alloys with Different Iron Content in High Temperature Water Environment

通过扫描电子显微镜和透射电子显微镜研究了不同Fe含量Ni-Cr-Fe合金在不同水化学条件的模拟压水堆一回路水环境中的氧化膜特性。结果表明:在310℃溶解氢含量2.6mg/L的模拟压水堆一回路水环境中浸泡978h,增加合金基体中的Fe含量会增加外层氧化膜中富Fe的尖晶石氧化物,并增加从富Cr的内层氧化膜向基体生长的局部氧化突出;在310℃含8mg/L溶解氧的模拟压水堆一回路水环境中浸泡1012h,增加合金基体中的Fe含量会引起外层氧化膜中疏松针状尖晶石氧化物的增加和不规则NiO颗粒的减少,并增加内层氧化膜的厚度和内层氧化膜中疏松区域的面积。

Oxide film properties of Ni-Cr-Fe alloys with different iron content in simulated PWR primary water environment with different water chemistry conditions were investigated by scan electron microscopy(SEM)and transmission electron microscopy(TEM).After 978 hof immersion in the high temperature water environment with 2.6 mg/L disolved hydrogen at 310℃,the resuts show that increasing the iron content in the alloys promoted the formation of the spinel oxide in the outer oxide layer and the growgh of local oxidation penetrations into the alloy matrix along the interface between the inner layer and alloy matrix.After 1012 h of immersion in the high temperature water environment with 8 mg/L disolved oxydrogen at 310℃,the resuts show that increasing the iron content in the alloy promoted the formation of spinel needle-like oxides and decreased the amount of atactic NiO particles in the outer layer,besides,increased the thickness and porous area in the inner layer.