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熔盐堆中使用的结构材料除了要保证高温力学性还要在高温下与熔盐具有良好的相容性,本文拟采用涂层技术,在高温力学性能较好的镍基合金上沉积一层耐氟盐腐蚀的纯镍金属层,解决镍基合金与高温氟盐相容性差的问题。纯镍金属层采用脉冲电沉积的方法获得,系统研究了电流密度对涂层性能的影响,并通过扫描电镜(SEM)和X射线衍射(XRD)等测试手段对涂层微观形貌、结构特征等进行分析。结果表明,随着电流密度的增加,涂层厚度呈线性增加,电流密度为40 m A·cm-2时,涂层厚度达102μm;而涂层织构系数(TC)在不同电流密度下都呈现(111)晶面增大而(200)晶面减小的趋势,织构强弱变化的本质与镍晶体不同晶面的表面能大小、沉积过电位、Ni(OH)2和氢原子对生长晶面的吸附作用有关;涂层显微硬度随着电流密度增大呈现出增加趋势。
In addition to the high temperature mechanical properties, the structural materials used in the molten salt reactor should have good compatibility with the molten salt at high temperature. This paper intends to use coating technology to deposit a layer of nickel-based alloy with better mechanical properties at high temperature Fluorine-resistant corrosion of pure nickel metal layer, nickel-based alloy to solve the problem of poor compatibility with high-temperature fluoride salt. The pure nickel metal layer was obtained by pulse electrodeposition. The influence of current density on the properties of the coating was systematically studied. The microstructure and structure of the coating were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) Analysis. The results show that the coating thickness increases linearly with the increase of current density, and the coating thickness reaches 102 μm at the current density of 40 m A · cm-2. The coating texture coefficient (TC) at different current densities The (111) crystal plane and the (200) crystal plane decrease with the increase of the surface energy, the overpotential, the Ni (OH) 2 and hydrogen atom pairs The growth of the crystal surface adsorption; coating microhardness increases with the current density shows an increasing trend.