Corrosion monitoring technologies for anti-corrosion coatings: Principles, advances and future perspectives
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Corrosion monitoring technologies for anti-corrosion coatings: Principles, advances and future perspectives

Jinke Wang
1,2,*
,
Jingya Huo
2,3
,
Sahaopeng Liu
2,3
,
Yanliang Chen
2,3
,
Lingwei Ma
1,2
*Correspondence to: Jinke Wang, Beijing Key Laboratory of Materials Intelligent Technology, School of Materials Advanced Innovation, University of Science and Technology Beijing, Beijing 100083, China; National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China. E-mail: jk_wang@ustb.edu.cn
Smart Mater Devices. 2026;2:202628. 10.70401/smd.2026.0046
Received: June 01, 2026Accepted: September 10, 2026Published: September 10, 2026
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This manuscript is made available in its unedited form to allow early access to the reported findings. Further editing will be completed before final publication. As such, the content may include errors, and standard legal disclaimers are applicable.

Abstract

Organic anti-corrosion coatings are extensively used to protect metallic structures, but conventional coatings mainly serve as passive barriers and offer limited information on concealed interfacial degradation. Once corrosive media pass through pores, cracks, or local delamination, under-coating corrosion may begin before visible rusting or coating blistering becomes evident. Early, in situ, and real-time monitoring of coating degradation is therefore necessary for assessing coating performance, clarifying failure mechanisms, and supporting timely maintenance. This review presents recent advances in corrosion monitoring technologies for anti-corrosion coatings. Electrochemical sensing methods, including electrochemical impedance spectroscopy, electrochemical noise monitoring, and galvanic corrosion sensors, are examined with respect to their signal mechanisms, sensor configurations, and suitability for service-state assessment. Optical and electromagnetic sensing techniques are subsequently reviewed for nondestructive and spatially resolved detection of under-coating corrosion. Special attention is given to corrosion-sensing coatings that introduce responsive molecules or micro/nanocontainers into coating matrices to realize pH- or metal ion-triggered fluorescent and colorimetric warning. Finally, the major remaining challenges and future research directions are discussed, including high-sensitivity detection, long-term signal stability, multi-signal coupling, quantitative interpretation, and engineering implementation of intelligent coating systems.

Keywords

Anti-corrosion coatings, corrosion monitoring, electrochemical sensors, optical sensors, corrosion-sensing coatings

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Wang J, Huo J, Liu S, Chen Y, Ma L. Corrosion monitoring technologies for anti-corrosion coatings: Principles, advances and future perspectives. Smart Mater Devices. 2026;2:202628. https://doi.org/10.70401/smd.2026.0046

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