电镀-高温氧化制备Cr2O3阻氚涂层

Cr2O3 Coating Prepared by Electroplating-high Temperature Oxidation as Tritium Permeation Barrier

摘要:

采用电镀-高温氧化技术在321不锈钢基材表面制备出了Cr2O3涂层，研究了氧化时间及氧化温度对涂层组织结构和表面形貌的影响。利用XRD、SEM、EDS等分析测试手段对涂层的组织结构、元素分析及形貌进行了表征，并对涂层的抗腐蚀性能和阻氢性能进行了测试。结果表明，电流密度为0.3 A/cm2、氧化温度为700 oC、氧化时间为4 h下获得的Cr2O3涂层，晶粒尺寸均匀，约为1 μm，晶粒之间结合紧密，孔隙少；Cr2O3涂层与基材之间存在Cr-O的过渡层，使Cr2O3涂层与基材结合紧密，界面处无空洞、裂纹等缺陷；且该涂层具有良好的抗腐蚀性能（0.98 10-4?μA/cm2）和抗热冲击性能（300次），阻氢渗透性能比基材提高了10.5倍。

Abstract:

Cr2O3 coating was successfully prepared on the surface of 321 steel substrate by electroplating-high temperature oxidation technology. The influence of oxidation treatment and oxidation time were investigated. The microstructures, elemental distribution and morphology of the coatings were characterized by XRD, SEM and EDS, respectively. The hardness, corrosion resistance and hydrogen resistance of the coatings were tested. The results show that the obtained Cr2O3 coating has tightly combined grains with uniform grain size of about 1 μm and low porosity when the oxidation temperature at 700 oC. The existence of a Cr-O transition layer between Cr2O3 coating and the substrate enables interfaces to bond closely. And no holes, cracks and other defects are found in interfaces. The coating exhibits good corrosion resistance, heat resistance of impact performance (300 times), resistance to hydrogen permeability increased by 10.5 times.