Abstract The purpose of this study is to prepare porous Zn-Ni coating with high infrared emissivity at a lower current density (1 A/cm2) by using dynamic hydrogen bubble template (DHBT) method. Three types of ceramic micro-particles (Al2O3, SiO2 and TiO2) are introduced into the electrolyte to investigate their effects on the surface morphology and infrared emissivity of Zn-Ni coating. The results show that uniform porous coatings can be obtained when these micro-particles are added into the electrolyte. The suspended micro-particles in electrolyte can prevent the H2 bubbles from rising up and escaping from the cathode, which is beneficial to the formation of porous structure, especially the insulating micro-particles, Al2O3 and SiO2. The uniform porous structure containing ceramic micro-particles is beneficial to improve infrared emissivity. In addition, the infrared emissivity of porous composite coating is also significantly dependents on the type of ceramic particles inside pores. Among the three types of micro-particles, TiO2 micro-particles have the greatest effect on the improvement of infrared emissivity which is increased from 0.83 to 0.91 when TiO2 micro-particles are deposited into the Zn-Ni coating.

中文翻译：

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提高Zn-Ni多孔涂层红外发射率的有效策略

摘要 本研究的目的是利用动态氢气泡模板（DHBT）法在较低电流密度（1 A/cm2）下制备具有高红外发射率的多孔Zn-Ni涂层。将三种类型的陶瓷微粒（Al2O3、SiO2 和 TiO2）引入电解液中，研究它们对 Zn-Ni 涂层表面形貌和红外发射率的影响。结果表明，将这些微粒加入电解液中可以获得均匀的多孔涂层。电解液中悬浮的微粒可以防止H2气泡从阴极上升和逸出，有利于多孔结构的形成，特别是绝缘微粒Al2O3和SiO2的形成。含有陶瓷微粒的均匀多孔结构有利于提高红外发射率。此外，多孔复合涂层的红外发射率也显着取决于孔隙内陶瓷颗粒的类型。在三种微粒中，TiO2微粒对红外发射率的改善作用最大，当TiO2微粒沉积在Zn-Ni涂层中时，其红外发射率从0.83增加到0.91。