Low-valence ion addition induced more compact passive films on nickel-copper nano-coatings |
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| Affiliation: | 1. Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin, 150001, China;2. Corrosion and Protection Institute, School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, China;3. Corrosion and Protection Division, Shenyang National Laboratory for Material Science, Northeastern University, Shenyang, 110819, China;4. School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia;5. Shipbuilding Faculty, Viet Nam Maritime University, Haiphong, Viet Nam;1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Scholl of Naval Architecture & Ocean Engineering, Jiangsu Maritime Institute, Nanjing 211170, China;3. Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou Unniversity, Taizhou 318000, China;4. Primary School of Education, Chongqing Normal University, Chongqing 400700, China;5. Monash Centre for Additive Manufacturing (MCAM), Monash University, Clayton, VIC 3800, Australia;6. Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing, School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, China;1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China;3. Department of Orthopedics, Affiliated Zhongshan Hospital of Dalian University, Dalian, 116001, China;1. Department of Physics, University of Science and Technology Beijing, Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field, Beijing, 100083, China;2. School of Automation, University of Science and Technology Beijing, Beijing, 100083, China;3. National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Key Laboratory of Advanced Materials of Ministry of Education of China, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, China;1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Materials Physics and Chemistry, Harbin Institute of Technology, Harbin 150001, China;3. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;4. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;5. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China;2. School of Metallurgy, Northeastern University, Shenyang, 110819, China;1. School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;2. College of Sciences, Northeastern University, Shenyang 110004, China |
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| Abstract: | Ni-Cu nano-coatings were prepared by pulsed electroplating technique in the baths containing various amount of boric acid. Their microstructure, morphologies and corrosion resistance were characterized in detail. The addition of boric acid strongly influences on the microstructure of the Ni-Cu coatings. The coating with a grain size of 130 nm, obtained from the bath containing 35 g L?1 boric acid, shows the highest corrosion resistance. This is attributed to the low-valence Cu ion (Cu+) additions in nickel oxide, which could significantly decrease the oxygen ion vacancy density in the passive film to form a more compact passive film. The higher Cu+ additions and the lower diffusivity of point defects (D0) are responsible for the formation of more compact passive film on the coating obtained from the bath with 35 g L?1 boric acid. |
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| Keywords: | Passive film Point defect Corrosion Electroplating Coating |
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