Graphite Sheet Cathode for Concrete Corrosion Prevention
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Solution Overview
Problem
Existing cathodic protection methods for reinforcing bars in concrete structures face challenges due to high labor costs and non-uniform conduction states, which can lead to inefficient corrosion protection and increased gas generation during electrolysis.
Innovation Solution
A corrosion protection anode using a graphite sheet with low horizontal volume resistivity and a gel electrolyte layer, which adheres uniformly to the concrete surface, eliminating the need for an electricity feeding material and ensuring consistent potential distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium mesh or titanium rod is used as corrosion protection cathode, then corrosion resistance is improved, but cost and labor requirements increase significantly
Solution Approach 1:
The patent replaces expensive, durable titanium-based cathodes with a cheaper, consumable carbon paste electrode. The carbon paste is applied as a coating that can be replenished when consumed, eliminating the need for expensive metal structures while maintaining cathodic protection functionality throughout the service life of the concrete structure.
Solution Approach 2:
The patent changes the material parameter from metal (titanium) to carbon-based material, and changes the form from solid rod/mesh to paste coating. This parameter change enables the electrode to be applied directly to the concrete surface without complex installation structures, significantly reducing labor and material costs while providing adequate corrosion resistance for the application.
2Area of stationary object
If conductive coating film is applied on concrete surface, then coverage is improved, but potential distribution becomes non-uniform leading to degradation and separation
Solution Approach 1:
The patent introduces a conductive adhesive as an intermediary substance between the carbon paste electrode and the concrete surface. This conductive adhesive ensures uniform electrical contact and potential distribution across the entire coated area, preventing degradation and separation while maintaining complete coverage of the concrete surface.
Solution Approach 2:
The patent creates a composite electrode system consisting of carbon paste coating combined with conductive adhesive. This composite structure integrates the high conductivity of the adhesive with the corrosion protection functionality of the carbon paste, achieving both uniform potential distribution and complete surface coverage.
3Reliability
If carbon fiber sheet with filling material layer is used, then corrosion protection is achieved, but construction complexity and labor requirements increase
Solution Approach 1:
The patent extracts and eliminates the complex multi-layer construction (carbon fiber sheet, filling material layer, adhesive layers, tubular bodies for air discharge) and replaces it with a simple single-layer carbon paste coating applied directly to the concrete surface. This extraction of unnecessary complexity maintains corrosion protection while dramatically simplifying the construction process.
Solution Approach 2:
The patent changes the physical form from rigid sheet structure to paste coating, and changes the application method from multi-step complex construction to simple direct coating. This parameter transformation maintains the essential corrosion protection function while eliminating construction complexity involving multiple layers and assembly steps.
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 reduces labor costs, maintains uniform conduction, minimizes gas generation during electrolysis, and allows for long-term cathodic protection with a lightweight, cost-effective anode design suitable for independent power sources.
Implementation Method 1
a conductive layer formed of a graphite sheet in which volume resistivity in a horizontal direction (a direction along a surface) is considerably lower than the volume resistivity in a vertical direction (a direction passing through the layer)
Implementation Method 2
an electrolyte layer formed in a sheet shape and having adhesive power such that the electrolyte layer is capable of adhering to a concrete surface
Data Source
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AI summary
The present invention is a corrosion protection cathode using an external power supply in which a reinforcing layer formed of a fiber base material is laminated with an adhesive layer on one surface of a conductive layer formed of a graphite sheet, and an electrolyte layer of an electrolyte-containing resin formed in a sheet shape and having adhesive power such that the layer is capable of being adhered to the conductive layer and to a surface layer of an object to be protected from corrosion is adhered by the adhesive power thereof to the other surface of the conductive layer, wherein the conductive layer always has a resistance value of 4 Ω or less between any two points on the surface thereof on a side that comes into contact with the electrolyte layer.