Corrosion Sensor Using Conductive Material Mixture
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Solution Overview
Problem
Existing corrosion monitoring methods are inadequate for real-time, continuous detection of corrosive gases at ppb-level concentrations, as they rely on slow and cumbersome off-line measurements that cannot respond to rapid changes and do not provide information on chemical composition or relative concentration.
Innovation Solution
A corrosion sensor comprising a mixture of corroding material (such as Ag, Cu, Zn, or Fe) and corrosion-resistant material (such as carbon in the form of graphite), which changes electrical resistance in response to exposure to corrosive gases, allowing for continuous monitoring and real-time detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-line analysis tools are used to detect layer thickness of corroded crust, then corrosion detection capability is provided, but measurement speed is slow and cannot respond to rapid changes
Solution Approach 1:
The patent replaces the mechanical/off-line measurement system with an electrical sensing system. Electrical corrosion sensors use changes in electrical properties (resistance, capacitance, impedance) to detect corrosion in real-time, eliminating the need for physical removal and laboratory analysis of corroded samples.
Solution Approach 2:
The patent implements continuous monitoring through electrical sensors that constantly measure corrosion parameters. This allows uninterrupted, real-time detection of corrosion processes, enabling immediate response to rapid changes in corrosion rate or environmental conditions.
2Measurement precision
If off-line measurements are performed on corroded metal sheets, then corrosion detection is achieved, but real-time continuous monitoring capability is lost
Solution Approach 1:
The patent substitutes periodic mechanical sampling with continuous electrical measurement systems. Electrical sensors can continuously monitor corrosion parameters without interrupting the process, providing both high measurement precision and uninterrupted monitoring capability.
Solution Approach 2:
The electrical corrosion sensors are designed to be self-monitoring devices that continuously assess their own state and the surrounding environment. The sensors perform their measurement function autonomously without requiring external intervention or sample removal, enabling true continuous monitoring.
3Measurement precision
If Ag corrosion sensor is used with thin film deposited on non-corroding base metal, then electrical resistance change provides corrosion indication, but device complexity increases
Solution Approach 1:
The patent uses composite material structures where a thin film of reactive metal (such as silver) is deposited on a corrosion-resistant base metal substrate. This composite structure combines the high corrosion sensitivity of the reactive metal thin film with the structural stability and electrical properties of the base metal, achieving accurate corrosion indication without excessive device complexity.
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 low-cost, continuous monitoring of corrosive gases, providing real-time information on corrosion behavior and allowing for quick response to changes in the corrosive gas atmosphere, with adjustable sensitivity based on the weight ratio of corroding to non-corroding materials.
Implementation Method 1
Corrosion refers to deterioration of metal due to chemical reactions between the metal and the environment
Implementation Method 2
The corroded Ag metal changes the resistor network resistance of the base metal and Ag thin film connected in parallel
Data Source
AI summary
A corrosion sensor is disclosed, including a mixture of corroding material and non-corroding material, wherein the corroding material and the non-corroding material are electrically conductive, the corroding material having higher electrical conductivity than the non-corroding material. An increase in the electrical resistance of the corrosion sensor, under exposure to corrosive gas that corrodes the corroding material, provides an indication of corrosion.