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[email protected] Innovations in Corrosion and Materials Science, 2019, 9, 50-59 RESEARCH ARTICLE ISSN: 2352-0949 eISSN: 2352-0957 Formation of Corrosion Resistant Hard Coating of LiTaO3 by Anodizing in Molten LiNO3 Likun Hu1, Sicheng Yuan1, Panping Xie1, Dengfeng Xu2, Zhi Peng2, Axi Xie3 and Feng Zheng1,2,* 1School of Materials Science and Engineering, Central South University, Hunan Changsha, 410083, P.R. China; 2Changsha South Tantalum Niobium Co., Ltd, Hunan Changsha, 410083, P.R. China; 3No.75 East Renmin Road, Chengguan town, Yongxing County, Hunan Chenzhou, 423301, P.R. China. Abstract: Background: Lithium tantalate (LiTaO3) thin film was synthesized and in situ coated on tantalum substrate via anodic oxidation. Methods: The effects of temperature, voltage and time on composition, morphology and hardness of film were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Vick- ers hardness, respectively. A R T I C L E H I S T O R Y Results: Our results showed that surface hardness of all coated samples has been increased compared with that of pure tantalum. The value of hardness was found to gradually increase with temperature, Received: June 28, 2018 Revised: December 3, 2018 voltage and reaction time of the coating process. Selected specimens, after coating, were immersed Accepted: January 30, 2019 into 10 wt% NaOH solution at 50oC for 96h to explore their anti-corrosion performance. Immersing DOI: results indicated that LiTaO3 coated samples have a smaller mass loss and corrosion rate compared 10.2174/2352094909666190211125527 to those of pure Ta substrate.