## 7 Corrosion Control and Monitoring
\begin{table}
\begin{tabular}{p{113.8 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline \hline
**Authors** & **Observational Platforms** & **Tools/Instruments** & **Important Remark** \\ \hline [PERSON] et al. (2015) & Steel reinforcing bar of the marine concrete structure & Tilted fiber Bragg grating (TFBG) sensors & Higher-order cladding resonances exhibit relatively higher sensitivity to corrosion times than the lower-order cladding resonance exist wavelength. \\ \hline [PERSON] et al. (2016) & Copper alloy marine structures & Oxygen-terminated Boron-doped diamond (BDD) disk by Diamond Detectors Ltd. & The monitoring by quantification of copper ions using the DPV technique results in an excellent linear relationship between peak current density and copper ion concentration. \\ \hline [PERSON] et al. (2016) & Coating breakdown/corrosion (CBC) in vessel structure (bulk carrier) & Semi-autonomous micro-aerial vehicles (MACs)—INCASS aerial platform & Future enhancement steps should comprise the fusion of the laser scanner with optical flow sensors to enlarge the inspection area. \\ \hline [PERSON] et al. (2017) & Atmospheric corrosion of T91 steel and Q235B exposed to Zhoushan offshore environment & Electrochemical noise (EN) is composed of a compact (cRIO) module, two zero resistance ammeter (ZRA) modules, a lithium-ion battery, DC power supply, and two atmospheric-corrosion-monitoring probes & The application of atmospheric probes in the offshore environment for a long time may not be suitable due to the formed rust layer. \\ \hline [PERSON] et al. (2017) & Offshore concrete structure & Optical fiber-based salinity sensor based on multimode plastic optical fiber (POF) as a sensor probe & More improvements are needed to reach the industrial expectation, including replacing the multi-axis stage to realize automatic survey, making the sensor probe and light source movable, and re-designing the sensor probe to attain simultaneous calculation. \\ \hline [PERSON] et al. (2019) & Ship hull structural plate & Convolutional neural network (CNN) model using image data (camera) & The CNN model training requires massive image data with different categories and conditions. \\ \hline [PERSON] et al. (2020) & Concrete columns with carbon and stainless steel reinforcements exposed to the north Adriatic coast environment & Electrical resistance (ER) probes and coupled multi-electrodes (CMEs) environment & The infrequent sampling rate of measurement by ER and CMEs is more problematic due to the severe changing exposure conditions. Continuous monitoring with wireless data acquisition can be implemented. \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Cont. sion, two passive electrochemical sensors (open circuit potential (OCP) and zero resistance ammeter (ZRA)) are merged into the sensor interface of the iWindCr system to monitor physical and electrochemical changes remotely and quantify the electrode potential and current. In this work, the corrosion parameter output and threshold value data of the foundation, tower, and gearbox of an offshore wind turbine were collected. The database can be used as a benchmark and guideline by end-users to implement corrosion monitoring in other complex structures. The proposed benchmark study points out that the technology should be applicable in different industrial sectors, such as marine, oil and gas, automobiles, etc. Figure 26: The user interface of iWindCr software [132]. Figure 25: Arrangement plan of the iWindCr WSN system [132]. In another recent study, [PERSON] et al. [133] investigated the monitoring of corrosion in structural members of a steel bridge truss in a real marine environment representing a severe corrosion environment due to high levels of airborne chlorides and humidity. In this case, steel plates and atmospheric corrosion monitoring (ACM) sensors were installed in different locations to measure the corrosion depth and galvanic corrosion current. The plates and sensors were installed in several places, including on the diagonal, horizontal, vertical, and portal members.