Corrosion resistance of multilayer coatings deposited by PVD on inconel 718 using electrochemical impedance spectroscopy technique

Gaona Tiburcio, Citlalli y Montoya Rangel, Marvin y Cabral Miramontes, José Ángel y Estupiñan López, Francisco H. y Zambrano Robledo, Patricia del Carmen y Orozco Cruz, Ricardo y Chacón Nava, José G. y Baltazar Zamora, Miguel Ángel y Almeraya Calderón, Facundo (2020) Corrosion resistance of multilayer coatings deposited by PVD on inconel 718 using electrochemical impedance spectroscopy technique. Coatings, 10 (6). pp. 1-10. ISSN 2079-6412

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URL o página oficial: https://doi.org/10.3390/coatings10060521

Resumen

AlCrN/TiSi, AlCrN/TiCrSiN and AlCrN/AlCrN + CrN coatings were deposited on Inconel 718 alloy by physical vapour deposition (PVD). The corrosion behaviour of uncoated and coated specimens was evaluated using electrochemical impedance spectroscopy (EIS) at open circuit potential in a 3.5 wt.% NaCl and 2 wt.% H2SO4 solutions. The EIS data acquired were curve fitted and analysed by equivalent circuit models to calculate the pore resistance, the charge transfer resistance and the capacitance. The Nyquist diagrams of all systems showed one part of the semicircle which could relate that reaction is a one step process, except for the AlCrN/TiCrSiN and AlCrN/AlCrN + CrN coatings in H2SO4 solution, for which two semicircles related to active corrosion in substrate alloy were found. However, from the Bode plots, it was possible to identify two the time constants for all systems exposed to NaCl and H2SO4 solutions. According to electrochemical results, the corrosion resistance of the AlCrN/TiSiN coating was better in the NaCl solution, whereas the AlCrN/AlCrN + CrN coating show better performance in the Sulphuric Acid solutions.

Tipo de elemento:

Article

Palabras claves no controlados:

PVD coatings, Corrosion, 718 inconel alloy, EIS

Materias:

CONACYT > Ingeniería y Tecnología
T Tecnología > TA Ingeniería General y Civil

Divisiones:

Ingeniería Mecánica y Eléctrica

Usuario depositante:

Dra Citlalli Gaona

Creadores:

Creador	Email	ORCID
Gaona Tiburcio, Citlalli	citlalli.gaonatbr@uanl.edu.mx	orcid.org/0000-0001-9072-3090
Montoya Rangel, Marvin	NO ESPECIFICADO	NO ESPECIFICADO
Cabral Miramontes, José Ángel	NO ESPECIFICADO	orcid.org/0000-0003-1483-3081
Estupiñan López, Francisco H.	NO ESPECIFICADO	NO ESPECIFICADO
Zambrano Robledo, Patricia del Carmen	patricia.zambranor@uanl.edu.mx	NO ESPECIFICADO
Orozco Cruz, Ricardo	NO ESPECIFICADO	NO ESPECIFICADO
Chacón Nava, José G.	NO ESPECIFICADO	NO ESPECIFICADO
Baltazar Zamora, Miguel Ángel	NO ESPECIFICADO	NO ESPECIFICADO
Almeraya Calderón, Facundo	facundo.almerayacl@uanl.edu.mx	orcid.org/0000-0002-3014-2814