Micromorphology and texture of niobium coating electrodeposited in NaCl−KCl−CsCl molten salt system  

NaCl−KCl−CsCl熔盐体系电沉积铌涂层的微观形貌和织构

作　　者：Shuang-peng HU Shu-xin BAI Li-an ZHU Yi-cong YE Zhen WANG Shun LI Yu TANG 胡双鹏;白书欣;朱利安;叶益聪;王震;李顺;唐宇(国防科技大学空天科学学院,长沙410073)

机构地区：[1]College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第11期3650-3662,共13页中国有色金属学报（英文版）

基　　金：the Special Fund of Hunan Province for Innovative Province Building-Support Program for Young Talents of Hunan,China(No.2020RC3034).

摘　　要：A low-toxicity and environment-friendly NaCl−KCl−CsCl−K_(2)NbF_(7) system was used to prepare Nb coatings on Mo substrates.The effects of temperature,current density and electrodeposition time on the micromorphologies and textures of the electrodeposited Nb coatings were studied.The results showed that Nb coatings obtained at 30−70 mA/cm^(2) in the temperature range of 700−750℃ were continuous and compact,with a hardness range of 2.16−2.45 GPa.As the columnar crystals grew with time,the preferential growth orientations of the Nb coatings changed from<200>to<211>and then became disordered.With increasing polarization,the morphologies of the Nb coatings changed from hexagonal star-like surface to conical or pyramid-like surface.采用一种低毒、环保的NaCl−KCl−CsCl−K_(2)NbF_(7)体系在Mo基体上制备Nb涂层。研究温度、电流密度和沉积时间对电沉积Nb涂层微观形貌和织构的影响。结果表明,当温度为700~750℃、电流密度为30~70 mA/cm^(2)时,可制备出连续致密的Nb涂层,其硬度为2.16~2.45 GPa。随着柱状晶不断生长,Nb涂层的择优取向按<200>→<211>→无序的顺序转变。随着极化程度的增大,Nb涂层从六角星形表面变为锥形或金字塔形表面。

关 键 词：niobium coating chloride molten salt electrodeposition MICROMORPHOLOGY texture 

分 类 号：TQ153[化学工程—电化学工业]