Electrochemical Impedance Spectroscopy of protective coatings

This work deals with localized electrochemical impedance spectroscopy (LEIS) which is an improved technique of the commonly used electrochemical impedance spectroscopy (EIS). Thanks to modern structural solutions, the LEIS technique ensures local impedance measurement. Therefore, it is used in the research into point corrosion, such as the pitting corrosion, and in the research into protective coatings or into alloys including alloy steels. This review paper presents the basic theory and the usability of the LEIS based on the literature on the newest research in the field of corrosion.

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Non - Destructive Evaluation of Protective Coatings on AA2024 - T3 Aluminum Alloy Used in Aeronautical Parts by Electrochemical Impedance Spectroscopy

Journal of Coating Science and Technology ◽

10.6000/2369-3355.2016.03.03.4 ◽

2016 ◽

Vol 3 (3) ◽

pp. 121-128

Author(s):

Alain Robin ◽

◽

Luis Pacheco ◽

Júlio Lourenço

Keyword(s):

Aluminum Alloy ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Protective Coatings ◽

Non Destructive Evaluation ◽

Non Destructive

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The use of odd random phase electrochemical impedance spectroscopy to study lithium-based corrosion inhibition by active protective coatings

Electrochimica Acta ◽

10.1016/j.electacta.2018.05.036 ◽

2018 ◽

Vol 278 ◽

pp. 363-373 ◽

Cited By ~ 13

Author(s):

M. Meeusen ◽

P. Visser ◽

L. Fernández Macía ◽

A. Hubin ◽

H. Terryn ◽

...

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Corrosion Inhibition ◽

Electrochemical Impedance ◽

Protective Coatings ◽

Random Phase

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Corrosion and Electrochemical Impedance Spectroscopy of Thin TiALN and TiCN PVD Coatings for Protection of Ballast Water Screen Filters

Latvian Journal of Physics and Technical Sciences ◽

10.2478/lpts-2021-0012 ◽

2021 ◽

Vol 58 (2) ◽

pp. 64-78

Author(s):

R. Kalnina ◽

V. Priednieks ◽

K. Lukins ◽

A. Gasparjans ◽

A. Rijkure

Keyword(s):

Stainless Steel ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Surface Passivation ◽

Electrochemical Impedance ◽

Protective Coatings ◽

Corrosion Behaviour ◽

Charge Transfer Resistance ◽

Transfer Resistance ◽

Ticn Coating

Abstract The electrochemical impedance spectroscopy (EIS) and corrosion behaviour of physical vapour deposited (PVD) TiAlN and TiCN coatings of 50 µm mesh shaped AISI 316 stainless steel were estimated under simulated marine conditions (3.5 wt. % NaCl solution). The coatings were prepared by creating adhesive Cr-CrN interlayer with the thickness of about 0.3 µm. The obtained thicknesses of produced coatings were measured to be in a range between 2 and 3.5 µm. The presence of protective coatings leads to corrosion potential (Ecorr ) shifting to more positive values as compared to the bare stainless steel. This effect indicates higher protection efficiency of coated steel under marine conditions. The protective behaviour of produced coating leads to the decreased corrosion current density (jcorr ) by indicating up to 40-fold higher polarization resistance as compared to resistance of the naturally formed oxide layer over the stainless steel. The Nyquist and Bode plots were obtained with the help of EIS measurements by applying alternating potential amplitude of 10 mV on observed Ecorr . The obtained plots were fitted by appropriate equivalent circuits to calculate pore resistance, charge transfer resistance and capacitance. The present study reveals that pore resistance was the highest in the case of TiCN coating (Rpore =3.22 kΩ·cm2). The increase in duration of the immersion up to 24 h leads to change in the capacitive behaviour of the coatings caused by the penetration of the aqueous solution into pore system of TiCN coating with low wettability and surface passivation of reactive TiAlN coating. The presence of defects was confirmed by examining the obtained samples with the help of the scanning electron microscope.

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