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Ni-P/Zn-Ni compositionally modulated multilayer coatings – part 2: corrosion and protection mechanisms
, Article Applied Surface Science ; Volume 442 , 2018 , Pages 313-321 ; 01694332 (ISSN) ; Ghorbani, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
The Ni-P/Zn-Ni compositionally modulated multilayer coatings CMMCs were electrodeposited from a single bath by switching the deposition current density. The corrosion resistance of the deposits was studied and compared with that of monolayers of Ni-P and Zn-Ni alloys via Tafel polarization, EIS and salt spray tests. Characterization of corrosion products by means of EDS and XRD revealed more details from the corrosion mechanism of the monolayers and multilayers. The corrosion current density of Ni-P/Zn-Ni CMMCs were around one tenth of Zn-Ni monolayer. The CMMC with incomplete layers performed lower polarization resistance and higher corrosion current density compared to the CMMC with...