Corrosion Detection Sensor with Dual Electrodes and Coating Film
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Solution Overview
Problem
Existing sensor devices for monitoring corrosion in concrete structures cannot accurately detect changes in pH levels before corrosion begins, limiting the ability to prevent reinforcing bar corrosion.
Innovation Solution
A sensor device with a configuration of first and second electrodes made from different metallic materials, along with a coating film, measures changes in electric potential to detect the presence or absence of passivation films and coating films, allowing for accurate pH detection and prediction of corrosion onset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fine wires are embedded in concrete to detect corrosion, then the timing of corrosion onset can be detected, but it is not possible to measure changes in the state of reinforcing bars or concrete during the period up until corrosion begins
Solution Approach 1:
The patent divides the detection function into two separate electrode systems: fine wires for detecting corrosion onset and pH electrodes for measuring pH changes. This segmentation allows each system to specialize in its specific measurement function, enabling both corrosion timing detection and continuous pH monitoring during the pre-corrosion period.
Solution Approach 2:
The patent introduces pH electrodes as intermediary sensing elements that measure pH changes in the concrete environment before corrosion occurs. These electrodes act as mediators between the concrete chemistry and the detection system, providing early warning information about approaching corrosive conditions without requiring the reinforcing bars to actually corrode.
2Reliability
If only fine wires are used for corrosion detection, then corrosion timing can be identified, but early warning information about pH changes is lost
Solution Approach 1:
The patent implements preliminary detection of pH changes using dedicated pH electrodes before corrosion actually occurs. By monitoring pH trends in advance, the system enables preservation planning actions to be taken earlier, while there is still time to prevent or mitigate corrosion damage to the reinforcing bars.
3Measurement precision
If multiple electrode types are added to measure pH changes, then early detection capability is improved, but device complexity increases
Solution Approach 1:
The patent designs the sensor device with multi-functional electrodes that can perform both corrosion detection and pH measurement functions. The electrode assembly is configured to integrate multiple sensing capabilities into a single unified device, reducing overall system complexity while maintaining comprehensive monitoring functions.
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 early detection of pH changes, allowing for proactive measures to prevent corrosion of reinforcing bars in concrete structures by accurately determining when the environment is approaching acidic or neutral states.
Implementation Method 1
The functional element is configured to measure a difference in electric potential between the first electrode and the second electrode that changes depending on presence or absence of each of the first passivation film and the coating film as associated with the changes in pH
Implementation Method 2
The first electrode includes a first metallic material, the first metallic material being a metallic material in which either a first passivation film forms on a surface thereof or the first passivation film present on the surface thereof is lost, in association with changes in the pH of a measurement site
Implementation Method 3
The coating film includes a third metallic material different from the first metallic material and from the second metallic material. The coating film covers at least one of the first electrode and the second electrode
Data Source
AI summary
A sensor device includes first and second electrodes, a coating film and a functional element. The first electrode includes a first metallic material in which either a first passivation film forms on a surface thereof or the first passivation film present on the surface thereof is lost, in association with changes in the pH of a measurement site. The second electrode includes a second metallic material different from the first metallic material, and is spaced apart from the first electrode. The coating film includes a third metallic material different from the first and second metallic materials. The coating film covers at least the first or second electrode. The functional element is configured to measure a difference in electric potential between the first and second electrodes that changes depending on presence or absence of each of the first passivation film and the coating film in association with the changes in pH.