Corrosion monitoring at the interface using sensors and advanced sensing materials: methods, challenges and opportunities.

Detecting and monitoring of corrosion is one of the major challenges in insulated metallic structures, or structures with one or more than one interface. This review paper aims to consolidate scattered literature on laboratory system-based corrosion measurement at the interface region. There are a range of sensor-based detection and monitoring methods (active and passive) for corrosion rate analysis, including those which measure a surrogate (i.e. quantifying moisture, temperature, pH) and qualify other changes or degradations at the interface. With the emergence of a novel application of advanced sensing methods, this review also presents the possibility of the application of hybrid and multifunctional sensing methods at the interfaces, aimed at advancing corrosion monitoring at the interface region. Key research areas of development relating to the application of combination of other materials (e.g. metal oxides, carbon nanotubes, metal nanowires, piezoelectric) as potential sensors and their impact on existing practices in the field are identified