Asymmetrical electrode effects in electrochemical noise diagnostics of organic coatings: Insights from NOCS modelling and experimentation

Mills, D., Lan, T., Nguyen, T.-K. and Jamali, S. (2025) Asymmetrical electrode effects in electrochemical noise diagnostics of organic coatings: Insights from NOCS modelling and experimentation. Progress in Organic Coatings. 208(Novemb) 0300-9440.

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Abstract:

Electrochemical noise (ECN) measurement stands out as a robust and useful method for assessing the performance of organic coatings, providing real-time insights into their corrosion resistance and protective capabilities. A series of practical electrode arrangements expanded the application of the technique to site settings and integration of robust pseudo-reference electrodes allows a deeper understanding of the durability and longevity of organic coatings in real-world applications. The studies of coatings primarily focus on identifying defects or coating degradation originated from two or three separate areas/electrodes depending on the experimental set up. Therefore, the noise resistance, i.e. Rn value, is an amalgamation of two/three areas with different resistances that could not be distinguished individually. Herein we examine the experimental set up so-called “no connection to substrate” or NOCS as a method for separating dissimilar impedances by making multiple rotational measurements. A comparison between the more practical Ag/AgCl and the standard laboratory reference electrode, saturated Calomel electrode, has also been made.

Additional Information:

This article is part of a Special issue entitled: ‘ACPOC2024’ published in Progress in Organic Coatings. S. Jamali acknowledges funding from Australian Research Council (ARC), Discovery Early Career Researcher Award (DECRA) DE210101137. T.-K. Nguyen acknowledges funding through the Griffith University Postdoctoral Fellowship, New Researcher Grant, and ARC DECRA No. DE240100408. Authors acknowledge the provision of testing instrumentation, ProCoMeter, and Ag/AgCl disc electrodes by DCVG ltd.

Uncontrolled Keywords:

Electrochemical noise measurement, organic coatings, Corrosion protection, Asymmetric electrodes, Noise resistance (Rn), NOCS configuration

Creators:

Mills, D., Lan, T., Nguyen, T.-K. and Jamali, S.

Date:

8 July 2025

Date Type:

Publication

Journal or Publication Title:

Progress in Organic Coatings

Volume:

208

Number:

Novemb

Number of Pages:

Language:

English

ISSN:

0300-9440

Status:

Published / Disseminated

Refereed:

Yes