Low-valence ion addition induced more compact passive films on nickel-copper nano-coatings

作     者：Quangquan Do Hongze An Guozhe Meng Weihua Li Lai-Chang Zhang Yangqiu Wang Bin Liu Junyi Wang Fuhui Wang 

作者机构：Corrosion and Protection LaboratoryKey Laboratory of Superlight Materials and Surface Technology(Harbin Engineering University)Ministry of EducationHarbin150001China Corrosion and Protection InstituteSchool of Chemical Engineering and TechnologySun Yat-Sen UniversityZhuhai519082China Corrosion and Protection DivisionShenyang National Laboratory for Material ScienceNortheastern UniversityShenyang110819China School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia Shipbuilding FacultyViet Nam Maritime UniversityHaiphongViet Nam 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2019年第35卷第10期

页      面：2144-2155页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51771061 and 51571067) National Basic Research Program of China (No. 2014CB643301) National Natural Science Foundation of Heilongjiang Province, China (No. E2016022) the Fundamental Research Founds for the Central Universities (No. HEUCFG201838) the Ministry of Science and Technology of China (No. 2012FY113000) Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education the Chinese Scholarship Council in conjunction with Harbin Engineering University & the Viet Nam Maritime University 

主　　题：Passive film Point defect Corrosion Electroplating Coating 

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 *** 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.