Corrosion Sensor Segmented Tracks for Reliable Detection
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Solution Overview
Problem
Existing corrosion sensors face challenges in accurately detecting the onset of corrosion due to unpredictable inhibitor depletion and potential for continued conduction through uncorroded areas, leading to unclear step changes in current flow and sensor output.
Innovation Solution
The design features parallel corrodible tracks with uniform thickness and gaps, ensuring consistent corrosion rates and clear step changes in resistance, with defects terminating in non-electrical connections to prevent pooling and maintain predictability, and using a serpentine current path to increase resistance and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inhibitor depletion sensors are used to detect corrosion onset, then corrosion detection capability is provided, but the sensor output becomes unclear due to unpredictable inhibitor depletion patterns and continued conduction through uncorroded areas
Solution Approach 1:
The sensor is divided into multiple discrete corrodible tracks (first track, second track, third track) arranged in series, each track providing a distinct resistance measurement point. This segmentation allows clear detection of corrosion progression through discrete resistance changes in individual tracks, resolving the measurement precision issue while maintaining reliable corrosion detection across multiple tracks.
2Measurement precision
If parallel corrodible tracks are used with uniform thickness, then consistent corrosion rates and clear step changes in resistance are achieved, but device complexity increases due to precise manufacturing requirements
Solution Approach 1:
The patent specifies precise geometric parameters for the corrodible tracks including uniform thickness (5-20 micrometers), width (50-200 micrometers), and spacing (20-50 micrometers). By controlling these physical parameters, the sensor achieves consistent corrosion rates and clear resistance step changes. The series arrangement of tracks multiplies the resistance effect, enhancing measurement precision without requiring overly complex device structures.
3Reliability
If defects terminate in non-electrical connections to prevent pooling, then predictability is maintained, but manufacturing complexity increases due to precise defect termination requirements
Solution Approach 1:
The paint defects are intentionally designed with specific termination points that occur before the ends of the corrodible tracks. This preliminary action of defining defect boundaries ensures that inhibitor depletion occurs in a controlled manner without pooling at track ends, maintaining sensor predictability. The defect dimensions (length, width) are predetermined during manufacturing to achieve the desired inhibition pattern.
4Measurement precision
If serpentine current path is used to increase resistance and sensitivity, then corrosion detection sensitivity is improved, but device complexity increases due to winding track configuration
Solution Approach 1:
The corrodible tracks are arranged in a serpentine or winding pattern that extends through multiple dimensions on the substrate surface. This dimensional arrangement increases the effective path length of current flow through the corrodible material, thereby increasing resistance and sensitivity to corrosion. The tracks wind back and forth across the sensor area, maximizing the corrosion detection path without requiring additional substrate layers or complex three-dimensional structures.
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
This design provides a more predictable and accurate indication of corrosion onset with clear step changes in resistance, enhancing the reliability of corrosion detection and reducing uncertainty in sensor readings.
Implementation Method 1
a corresponding increase in the sensor resistance can be measured
Implementation Method 2
The conductive thin film 120 is formed on the substrate 110 by sputtering
Implementation Method 3
the defect will be protected from corrosive media by inhibitor species leaching from the paint
Data Source
Figure 1~2
Figure 3~4
AI summary
A corrosion sensor for detecting the action of corrosive media on a metallic component when the sensor is mounted in the vicinity of the metallic component in use is disclosed. The sensor includes an electrically conducting corrodible element mounted on a non conducting substrate, the corrodible element being covered with a protective coating such as paint adapted to protect the corrodible element from corrosive media. The protective coating defines a temporary feature such as a paint defect which extends across the corrodible element and is designed to permit attack on the corrodible element by corrosive media after a predetermined period of time. The corrodible element comprises a pair of spaced tracks extending generally in a longitudinal direction and a series of corrodible tracks, each corrodible track extending generally in a lateral direction and forming an electrical connection between the spaced tracks. The temporary feature extends longitudinally, in the space between the pair of tracks, across a number of the corrodible tracks whereby to permit a corrosive attack on a number of the corrodible tracks after the predetermined period of time.