负向电压对氢化锆表面防氢渗透层的影响

Influence of negative voltage on hydrogen permeation barriers on the surface of zirconium hydride

采用微弧氧化技术在氢化锆表面制备防氢渗透层.采用磷酸盐电解液体系,溶液组成为Na5P3O1012 g/L,NaOH1.5 g/L,Na2EDTA 2 g/L.实验中正向电压为350 V,频率固定在200 Hz,通过改变负向电压在氢化锆表面制备防氢渗透层,负向电压的变化范围为120～160 V.采用XRD,SEM和称重试验等分析测试方法对膜层的厚度、组成、结构和形貌等进行了分析.实验结果表明,膜层的厚度随着负向电压的增加而减小,厚度在72.5～62μm之间变化.膜层的氢渗透降低因子(PRF值)随着负向电压的增大由9.8下降到7.6;负向电压对膜层的组成和结构无明显影响规律.

Micro-arc oxidation technology was used to fabricate hydrogen permeation barrier on surface of zirconium hydride.Phosphate electrolytic liquid department was used,and the solution was composed of Na5P3O1012 g/L,NaOH1.5 g/L and Na2EDTA2 g/L.The positive voltage is 350 V,and the frequency is 200 Hz in the experiment.The negative voltage was changed from 120 V to 160 V in the processing of hydrogen permeation barriers.The XRD,SEM and weighting analytical methods were adopted to analyze the thickness,composition,structure and morphology of the barriers.The results show that thickness of the oxide layer decrease with increasing the negative voltage,and the thickness varied between 72.5~62 μm..The hydrogen permeability reduces factor(PRF values) of the oxide layers decreases from 9.8 to 7.6.Negative voltage had no obvious effect on composition and structure of the oxide layers.