Copper Conduit Polyamide Barrier Against Formicary Corrosion
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Solution Overview
Problem
Air conditioning conduits are prone to 'formicary corrosion,' which leads to premature deterioration and coolant fluid loss, due to the simultaneous presence of moisture, oxygen, and organic acids on the outer surface of the conduits.
Innovation Solution
A process involving the application of a polyamide anti-corrosion barrier layer and an adhesive on the outer surface of copper tubes, followed by insulation, to create a protective layer that prevents corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If copper tubes are used for air conditioning conduits, then good thermal conductivity and ease of installation are achieved, but susceptibility to formicary corrosion increases
Solution Approach 1:
The patent applies a multi-layer composite coating system on copper tubes consisting of a primer layer (epoxy or polyethylene) and a topcoat layer (polyurethane or polyester). This composite structure combines the advantages of different materials: the primer provides adhesion and basic corrosion protection, while the topcoat provides enhanced resistance to formicary corrosion and UV stability, thus maintaining copper's thermal conductivity while significantly improving corrosion resistance.
Solution Approach 2:
The patent introduces an intermediary coating layer between the copper tube and the external environment. This coating acts as a mediator that prevents direct contact between corrosive agents (organic acids, moisture, oxygen) and the copper surface, thereby eliminating the formicary corrosion reaction while preserving the thermal conductivity of the copper material.
2Reliability
If strict installation criteria are followed to avoid formicary corrosion, then corrosion resistance is improved, but installation complexity and difficulty increase
Solution Approach 1:
The patent applies protective coating layers to the copper tubes during the manufacturing process before installation. This preliminary action ensures that corrosion protection is already in place when the conduits are installed, eliminating the need for complex installation criteria and procedures to prevent formicary corrosion. The protection is built-in rather than requiring careful installation practices.
3Reliability
If moisture and condensation are prevented from entering the gap between copper tube and insulation, then formicary corrosion is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent introduces an intermediary coating layer that adheres to the copper tube surface and extends to the interface with the insulation layer. This intermediary layer creates a continuous protective barrier that prevents moisture and condensation from entering the gap between the copper tube and insulation, eliminating the need for complex sealing structures or discontinuous insulation arrangements.
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 protective layer effectively counteracts 'formicary corrosion,' ensuring the longevity of the conduits and preventing coolant fluid loss, while maintaining high manufacturing speed and economic sustainability.
Implementation Method 1
cleaning said copper tube by plasma treatment
Implementation Method 2
heating said copper tube to complete the cleaning step
Implementation Method 3
applying at least one adhesive to the outer surface of said copper tube; applying at least one polyamide anti-corrosion barrier layer to said adhesive
Data Source
AI summary
A continuous process for producing an air conditioning conduit is provided. The continuous process involves unwinding a copper tube from at least one coil and straightening the copper tube, cleaning the copper tube by plasma treatment, heating the copper tube to complete the cleaning of the copper tube, applying at least one adhesive on an outer surface of the copper tube, applying at least one polyamide anti-corrosion barrier layer over the at least one adhesive, cooling the copper tube coated with the at least one adhesive and the at least one polyamide anti-corrosion barrier layer, and applying around the coated and cooled copper tube at least one insulation layer made of closed-cell insulation material, thus obtaining the air conditioning conduit. The continuous process has the advantages of producing an air conditioning conduit that counteracts the phenomenon of formicary corrosion.