Flexible LPR Sensor for Real-Time Corrosion Monitoring
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Solution Overview
Problem
Current corrosion monitoring techniques, such as corrosion coupons and linear polarization resistance (LPR) methods, face limitations in providing real-time, on-line data and are often labor-intensive, require calibration, or are restricted to specific environments, while indirect methods like ultrasonic testing and radiography lack real-time capabilities and are time-consuming.
Innovation Solution
A micro linear polarization resistance sensor device with three electrodes, including interdigitated electrodes on a flexible substrate, measures corrosion by calculating polarization resistance and accounting for time of wetness and salinity, allowing for direct, real-time monitoring without introducing galvanic corrosion and enabling measurement of corrosion beyond electrode thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LPR probes are used for corrosion monitoring, then corrosion rate can be measured instantaneously, but the measurement can only be performed in relatively clean aqueous electrolytic environments
Solution Approach 1:
The patent changes the physical and chemical parameters of the sensor by using a flexible substrate with micro-fabricated interdigitated electrodes instead of traditional rigid LPR probes. This allows the sensor to adapt to different environmental conditions including non-aqueous electrolytes, expanding the operational parameters beyond clean aqueous environments while maintaining corrosion rate measurement capability
2Reliability
If corrosion coupons are used for monitoring, then reliable physical evidence of corrosion is obtained, but significant time and labor are required and real-time monitoring cannot be achieved
Solution Approach 1:
The patent replaces the mechanical/coupon-based corrosion monitoring system with an electrochemical sensing system using micro-fabricated interdigitated electrodes. This substitution enables continuous real-time electrical measurement of corrosion rates while maintaining reliable data, eliminating the need for physical coupon retrieval and laboratory analysis
Solution Approach 2:
The flexible sensor with interdigitated electrodes enables continuous real-time monitoring of corrosion rates through persistent electrochemical measurements. The sensor maintains continuous contact with the structure and provides ongoing data without interruption, unlike coupon methods that require periodic retrieval and analysis
3Loss of time
If ER probes are used for corrosion monitoring, then metal loss can be measured at any time while the probe is in situ, but calibration with material properties of the structure is required
Solution Approach 1:
The patent employs self-service principles by designing the interdigitated electrode sensor to automatically adapt to the local environment and structure being monitored. The sensor performs self-calibration through its electrochemical measurements, eliminating the need for external calibration with material properties while providing continuous metal loss data
4Object-affected harmful factors
If ultrasonic testing and radiography are used for corrosion detection, then non-destructive and non-intrusive measurement is achieved, but significant time and labor are required and real-time monitoring cannot be performed
Solution Approach 1:
The patent replaces time-consuming ultrasonic and radiographic mechanical testing methods with electrochemical sensing using interdigitated electrodes. This substitution provides real-time corrosion rate data through electrical measurements while maintaining non-intrusive monitoring capability, eliminating the need for repeated physical inspections
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate, real-time corrosion monitoring with enhanced sensitivity and independence from electrode thickness, allowing for precise measurement of corrosion rates and environmental factors like wetness and salinity, overcoming the limitations of existing methods.
Implementation Method 1
Direct corrosion monitoring measures a response signal, such as current or potential, generated as a direct result of oxidation-reduction reactions
Implementation Method 2
The measurement of corrosion rate is made instantaneously through linear polarization resistance technique
Implementation Method 3
ER probes provide a basic measurement of metal loss
Data Source
AI summary
Systems and methods are disclosed for monitoring corrosion of a structure by using the structure itself as part of the electrochemical measurement. According to some implementations, linear polarization resistance (LPR) sensor devices for direct monitoring of corrosion on a structure are presented. According to certain innovations herein, a sensor device may include three electrodes, such as a counter electrode, a reference electrode, and a working electrode comprised of the structure being monitored. In further embodiments, each electrode may be configured on a polymer flexible substrate cable such as polyimide, with each electrode fabricated from a noble metal, for example, gold-plated copper, or metal systems in which the exterior surface will not oxidize from environmental exposure.