Copper Alloy Aquaculture Mesh With Dual Oxide Antifouling Surface
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Solution Overview
Problem
Current materials used in aquaculture netting, such as polymer and metal cages, face challenges in providing adequate chemical resistance and mechanical strength to withstand sea water corrosion, biofouling, and mechanical stress from wave action and predators.
Innovation Solution
A wire material with a dual-layer oxide surface is developed, comprising a thick first oxide layer for corrosion protection and a thin second oxide layer for antifouling properties, formed through specific metal alloy processing techniques like hot and cold forming with intermediate heat treatments, optimizing corrosion resistance and antifouling capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick oxide layer is formed on the wire material, then corrosion resistance is improved, but antifouling properties deteriorate
Solution Approach 1:
The oxide surface is segmented into two distinct layers: a thick first oxide layer (200 nm to 2 μm) for corrosion protection and a thin second oxide layer (0.01 to 10% of the first layer's thickness) for antifouling properties. This segmentation allows each layer to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different regions of the oxide surface have different qualities and thicknesses. The first oxide layer provides thick corrosion protection in areas where it forms, while the second oxide layer provides thin antifouling protection in areas where it forms. This local differentiation of quality enables simultaneous achievement of corrosion resistance and antifouling properties.
2Reliability
If copper-based alloys are used for their corrosion resistance, then chemical resistance in sea water is improved, but metal element release into the environment increases
Solution Approach 1:
The oxide layer thickness parameter is changed and optimized to reduce metal element release. The thick first oxide layer (200 nm to 2 μm) acts as a barrier that significantly reduces the release of copper and other metal elements into the environment, while still maintaining the chemical resistance of the copper-based alloy in sea water.
3Strength
If the wire material is subjected to hot forming and cold forming processes, then mechanical strength is improved, but the oxide surface formation becomes more complex
Solution Approach 1:
The oxide surface is formed preliminarily during the hot forming and cold forming processes themselves, rather than as a separate post-processing step. The intermediate heat treatments during forming operations promote oxide layer formation in situ, integrating the oxide surface creation with the mechanical forming operations and reducing overall process 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
The dual-layer oxide surface significantly reduces metal element release into sea water, enhances corrosion resistance, and improves antifouling properties, while maintaining mechanical strength and wear resistance, addressing the need for sustainable and durable aquaculture netting solutions.
Implementation Method 1
a wire material of metallic material having an oxide surface, wherein the oxide surface of the wire material has a first oxide layer which partly covers the metallic material and has a thickness of at least from 200 nm to 2 μm
Implementation Method 2
the oxide surface of the wire material has a second oxide layer which covers the metallic material in the regions which are not covered by the first oxide layer. Here, the second oxide layer has a thickness of from not more than 0.01 to 10% of the thickness of the first oxide layer
Data Source
AI summary
The invention relates to a wire material consisting of metallic material having an oxide surface, wherein the oxide surface of the wire material has a first oxide layer, which covers the metallic material at least in part and has a thickness of at least 200 nm to 2 μm, and the oxide surface of the wire material has a second oxide layer which covers metallic material in the regions which are not covered by the first oxide layer. According to the invention, the second oxide layer has a maximum thickness of 0.01 to 10% of the thickness of the first oxide layer. The invention furthermore relates to a mesh and a breeding cage for aquaculture.