J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (12): 1186-1192.DOI: 10.1016/j.jmst.2015.10.011

• Orginal Article • Previous Articles     Next Articles

Effect of Microstructures on Corrosion Behavior of Nickel Coatings: (I) Abnormal Grain Size Effect on Corrosion Behavior

Guozhe Meng1, 2, *, Yang Li1, Yawei Shao1, 2, Tao Zhang1, 2, Yanqiu Wang1, Fuhui Wang1, 2, Xuequn Cheng3, Chaofang Dong3, Xiaogang Li2, 3   

  1. 1 Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, China;
    2 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China3 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2015-05-13 Revised:2015-07-22 Online:2015-12-19
  • Contact: Ph.D.; Tel.: +86 451 82519190; Fax: +86 451 82519190 E-mail address: mengguozhe@hrbeu.edu.cn (G. Meng).
  • Supported by:
    The authors acknowledge the financial support from the National Basic Research Program of China (No. 2014CB643301), the National Natural Science Foundation of China (Nos.50971050 and 51001036), the Program for New Century Excellent Talents in University(No. NCET-11-0575), the Ministry of Science and Technology of the People's Republic of China (No. 2012FY113000) and the Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education (HEUCF20151011).

Abstract: Nickel coatings with different microstructures were synthesized by pulse jet electrodeposition technique. Their morphology and microstructure were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The corrosion property of the coatings was studied by using polarization, electrochemical impedance spectroscopy (EIS), potential of zero free charge (PZFC) measurements and Mott-Schottky (M-S) relationship. The results showed that the coating with grain size of 50 nm possessed higher corrosion resistance than that with grain size of 10 nm. This abnormal behavior may be related to the existence of nanoscale twins in the coatings and the lower concentration of acceptor in the passive films.

Key words: Nanocrystalline, Pulse jet electrodeposition, Corrosion, Grain size, Growth twins