Abstract
The corrosion behavior of electrodeposited nanocrystalline (NC) zinc coatings with an average grain size of 43 nm was investigated in 3.5% NaCl solutions in comparison with conventional polycrystalline (PC) zinc coatings by using electrochemical measurement and surface analysis techniques. Both polarization curve and electrochemical impedance spectroscopy (EIS) results indicate that NC and PC coatings are in active state at the corrosion potentials, and NC coatings have much higher corrosion resistance than PC ones. The corrosion products on both coating surfaces are mainly composed of ZnO and Zn5(OH)8Cl2·H2O, but the corrosion products can form a relatively more protective layer on NC coating surfaces than on PC coatings. The EIS characteristics and corrosion processes of PC and NC zinc coatings during 330 h of immersion were discussed in detail.
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The financial support provided by Natural Science Foundation of China (NSFC) in combination with Shanghai BaoSteel Company (grant No. 50471105) is greatly appreciated.
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Li, M.C., Jiang, L.L., Zhang, W.Q. et al. Electrochemical corrosion behavior of nanocrystalline zinc coatings in 3.5% NaCl solutions. J Solid State Electrochem 11, 1319–1325 (2007). https://doi.org/10.1007/s10008-007-0293-5
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DOI: https://doi.org/10.1007/s10008-007-0293-5