Gas-Retaining Surface Cover for Marine Corrosion and Fouling
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Solution Overview
Problem
Existing technologies fail to maintain a permanent separation of a body's surface from surrounding liquids using an air layer, leading to issues like corrosion and increased flow resistance, especially in marine environments where biocides can contaminate water.
Innovation Solution
A gas-retaining layer is applied to the body, comprising a gas-permeable layer and a gas-supplying device, which maintains a constant gas volume by feeding gas through a porous structure with hydrophobic and hydrophilic regions, preventing liquid contact and reducing fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas layer is used to separate the body surface from surrounding liquid, then corrosion and fouling are prevented, but the gas layer is depleted over time due to bubble detachment and gas dissolution
Solution Approach 1:
The porous structure serves itself by utilizing surface tension effects at the pore openings to automatically retain gas bubbles without requiring external control mechanisms. The hydrophobic-hydrophilic pattern creates self-sustaining capillary pressure that prevents gas escape, allowing the structure to maintain the gas layer autonomously
Solution Approach 2:
The invention employs a porous structure where the pore size and surface properties are specifically designed to trap and retain gas bubbles. The porous nature allows liquid to be excluded while maintaining structural integrity, and the gas bubbles are held within the pores through surface tension forces at the pore openings
2Object-affected harmful factors
If biocides are used to prevent fouling in marine environments, then fouling is reduced, but toxic substances are released into the water
Solution Approach 1:
The invention converts the naturally occurring surface tension phenomenon into a beneficial antifouling mechanism. Instead of using chemical biocides that harm the environment, the porous structure with hydrophobic-hydrophilic patterning creates physical conditions that prevent organism attachment, turning a physical property into a protective function
Solution Approach 2:
The gas layer retained in the porous structure acts as an intermediary barrier between the body surface and the surrounding liquid environment. This intermediate gas phase prevents direct contact between potential fouling organisms and the solid surface, eliminating the need for chemical biocides
3Reliability
If the gas layer thickness is increased to improve separation, then protection is enhanced, but the structure becomes more complex and gas consumption increases
Solution Approach 1:
The porous structure functions as a thin film or shell that retains gas bubbles close to the surface. The structure maintains effective separation with minimal gas layer thickness by utilizing the porous matrix to hold gas bubbles in direct contact with or very near the protected surface, eliminating the need for thick gas layers
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 effectively prevents corrosion and fouling by maintaining a gas layer between the body and liquid, reducing flow resistance and minimizing the release of toxic substances into the water, thus extending the lifespan of marine structures and reducing environmental impact.
Implementation Method 1
a gas-permeable layer which is arranged on the gas-containing layer on a face that faces the body
Implementation Method 2
feeding gas through a porous structure with hydrophobic and hydrophilic regions, preventing liquid contact
Implementation Method 3
reducing flow resistance and minimizing the release of toxic substances into the water
Data Source
AI summary
The present invention relates to a surface cover for a body which can be brought into contact with a liquid, comprising: a layer which at least partly contains gas and which is designed and arranged such that at least some sections of a layer face facing the liquid contacts the liquid; a gas-permeable layer which is arranged on the gas-containing layer on a face that faces the body and is opposite the face facing the liquid or which is integrally formed with the gas-containing layer; and a gas-supplying device which is connected to the gas-permeable layer such that gas can flow from the gas-supplying device to the gas-containing layer through the gas-permeable layer. The invention also relates to an arrangement and a use.