Ferromagnetic Layer Corrosion Detection Through Magnetic Field Mapping
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Solution Overview
Problem
Existing methods for detecting corrosion in metal reinforcements embedded in structures like reinforced concrete are costly, require direct access, are prone to measurement errors due to environmental factors, and lack effective preventive maintenance capabilities.
Innovation Solution
A method involving the measurement and comparison of magnetic characteristic values of permanent magnets attached to ferromagnetic layers, using a three-dimensional reference frame to estimate corrosion by comparing acquired magnetic field data, and employing a calibration curve to deduce corrosion and pathogen infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If core sampling tests are used to determine chloride ion concentration, then corrosion progress can be estimated, but the method is destructive and limits sampling across the entire structure
Solution Approach 1:
The patent uses magnetic sensors to create a non-destructive copy of the corrosion state by measuring magnetic field variations caused by chloride ion concentration and reinforcement corrosion. This replaces destructive core sampling with a magnetic field-based measurement system that can assess the entire structure without physical removal of material.
Solution Approach 2:
The patent replaces the mechanical core sampling process with a magnetic field-based measurement system. Magnetic sensors detect changes in magnetic properties caused by corrosion and chloride infiltration, substituting physical material removal with field-based detection that preserves the structure integrity.
2Ease of operation
If electromagnetic radar is used for corrosion detection, then non-contact measurement is achieved, but measurement results are sensitive to environmental factors such as humidity and chloride levels
Solution Approach 1:
The patent introduces magnetic sensors as an intermediary between the electromagnetic field and the corrosion targets. These sensors detect magnetic field variations caused by corrosion, providing a measurement mechanism that is less sensitive to environmental factors like humidity and chloride levels compared to direct electromagnetic radar measurement.
Solution Approach 2:
The patent changes the measurement parameter from direct electromagnetic wave reflection to magnetic field property variations. By measuring changes in magnetic permeability and conductivity associated with corrosion, the system achieves more stable measurements that are less affected by environmental conditions.
3Duration of action of stationary object
If integrated monitoring techniques with sensors are implemented, then long-term corrosion monitoring is achieved, but the cost and device complexity increase significantly
Solution Approach 1:
The patent employs magnetic sensors that serve multiple functions: detecting chloride ion concentration, monitoring reinforcement corrosion, and assessing coating degradation. This multi-functionality reduces the need for multiple specialized sensors, thereby lowering overall system complexity while maintaining long-term monitoring capability.
Solution Approach 2:
The patent monitors temporal changes in magnetic field parameters to detect corrosion progression over time. By tracking variations in magnetic permeability and field strength, the system achieves long-term monitoring through simple, repeatable measurements that do not require complex sensor configurations.
4Ease of operation
If visual inspections are used to identify cracks, then surface defects can be detected, but the method cannot assess internal corrosion of embedded reinforcement
Solution Approach 1:
The patent replaces visual inspection with magnetic field-based detection that can penetrate concrete and sense internal reinforcement conditions. Magnetic sensors detect changes in magnetic properties caused by corrosion of embedded steel, providing information about internal conditions that visual inspection cannot access.
Solution Approach 2:
The patent uses magnetic field lines as an intermediary to probe internal reinforcement conditions. The magnetic field penetrates the concrete coating and interacts with the embedded steel reinforcement, allowing detection of corrosion state without direct visual access to the internal components.
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
Enables accurate, non-destructive corrosion detection and preventive maintenance by reducing measurement errors and environmental interference, allowing for timely maintenance to extend the lifespan of infrastructure.
Implementation Method 1
measuring a value of a magnetic characteristic (B) by means of the measuring device at the location determined in the determination step
Implementation Method 2
detecting corrosion of a ferromagnetic corrodible layer comprising... measuring a value of a magnetic characteristic... of a magnet
Data Source
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AI summary
One aspect of the invention relates to a method for detecting corrosion of a corrodible ferromagnetic layer (100) comprising: a step (E1) of acquiring data from different locations (Em10, Em11, Em12) of at least one magnet (10, 11, 12), of the magnetic characteristic value for each magnet (10, 11, 12); a step of determining a location (Ea210, Ea211, Ea212) of a measuring device (20); a step of measuring and recording (E3) a magnetic flux density (B) at the location (Ea210, Ea211, Ea212); a step of estimating (E4) by the processor (21) a magnetic characteristic value of at least one magnet (10, 11, 12) as a function of the measured magnetic flux density (B); a step of comparing the estimated magnetic characteristic value and that previously estimated or acquired, a deduction step (E6) of corrosion of the corrodable layer (100, 110,120) depending on the comparison made in the comparison step (E5).