| 1 | Low-valence ion addition induced more compact passive films on nickel-copper nano-coatings显示文摘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 Do Hongze An Guozhe Meng Weihua Li Lai-Chang Zhang Yangqiu Wang Bin Liu Junyi Wang Fuhui Wang | 2019 | Journal of Materials Science & Technology2019，35，10： | 1 |
| 2 | High corrosion resistance film on rebar by cerium modification显示文摘A cerium film was prepared on the surface of rebar by chemical conversion method to enhance its corrosion resistance.The film in the simulated concrete pore solution was measured by electrochemical method,transmission electron microscope(TEM)and X-ray photoelectron spectroscopy(XPS).The effect of temperature on film formation was studied,and the optimum temperature was determined at 35℃.The film produced by too high formation temperature has more defects,resulting in the lower corrosion resistance.The Ce film resistance increased with time evolution until 800 h,then decreased and stabilized.The Ce film layer has a double-layer film structure,the upper layer is an oxide of cerium,and the underlayer is an oxide of iron.Results revealed that after being immersed in the simulated concrete pore solution,the corrosion resistance of the Ce film was enhanced by self-densification. | Hongze An Zhengyi Xu Guozhe Meng Weihua Li Yanqiu Wang Bin Liu Junyi Wang Fuhui Wang | 2021 | Journal of Materials Science & Technology2021，，5： | 0 |
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