Low-valence ion addition induced more compact passive films on nickel-copper nano-coatings
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第10期
论文作者：Quangquan Do Hongze An Guozhe Meng Weihua Li Lai-Chang Zhang Yangqiu Wang Bin Liu Junyi Wang Fuhui Wang
文章页码：2144 - 2155
摘 要：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.
Quangquan Do1,2，Hongze An1，Guozhe Meng1,3，Weihua Li3，Lai-Chang Zhang4，Yangqiu Wang1，Bin Liu1，Junyi Wang1，Fuhui Wang1,5
1. Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education2. Shipbuilding Faculty, Viet Nam Maritime University3. Corrosion and Protection Institute, School of Chemical Engineering and Technology, Sun Yat-Sen University4. School of Engineering, Edith Cowan University5. Corrosion and Protection Division, Shenyang National Laboratory for Material Science, Northeastern University
摘 要：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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