Rubber Composition Insulation Reduces Galvanic Corrosion
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Solution Overview
Problem
Rubber hoses in vehicles face galvanic corrosion due to potential differences between metal clamps and rubber materials, leading to deterioration and increased manufacturing costs with existing zinc galvanizing solutions.
Innovation Solution
A rubber composition incorporating a blend of EPDM rubbers with specific ethylene and 5-ethylidene-2-norbornene content, combined with carbon black, silica, anti-aging agents, and a plasticizer, to enhance electrical insulation resistance and prevent galvanic corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc galvanizing is applied to reduce corrosion, then corrosion resistance is improved, but manufacturing cost increases and plating cracks occur during clamp assembly
Solution Approach 1:
The patent removes the zinc plating layer from the clamp and instead applies a rubber coating directly to the metal surface. This eliminates the intermediate plating process and its associated costs while preventing galvanic corrosion through electrical insulation. The rubber composition is formulated to provide adequate adhesion to metal without requiring a plating layer.
Solution Approach 2:
The patent introduces a rubber coating as an intermediary layer between the metal clamp and the electrolyte environment. This rubber layer acts as an electrical insulator, preventing the formation of galvanic cells without requiring zinc plating. The rubber composition includes adhesion promoters to ensure proper bonding to the metal surface.
2Reliability
If zinc galvanizing is applied to reduce corrosion, then corrosion resistance is improved, but plating cracks are caused during clamp assembly
Solution Approach 1:
The patent eliminates the zinc plating layer entirely and replaces it with a rubber coating system. This removes the source of plating cracks that occur during clamp assembly operations, while maintaining corrosion protection through the rubber barrier and adhesion promoters in the composition.
Solution Approach 2:
The patent uses a composite rubber composition containing multiple components including adhesion promoters, crosslinking agents, and protective additives. This composite material provides both adhesion to the metal surface and resistance to cracking during assembly, overcoming the brittleness issues of zinc plating.
3Ease of manufacture
If conventional rubber composition is used, then manufacturing cost is reduced, but electrical insulation resistance is insufficient leading to galvanic corrosion
Solution Approach 1:
The patent modifies the chemical composition parameters of the rubber material by incorporating specific adhesion promoters, crosslinking agents, and protective additives. These compositional changes enhance electrical insulation resistance and prevent galvanic corrosion while maintaining cost-effectiveness through the use of rubber rather than metal plating.
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 rubber composition achieves significantly improved electrical insulation resistance, maintaining durability and corrosion resistance while preventing galvanic corrosion, as demonstrated by enhanced material and system durability tests.
Implementation Method 1
the electrical resistance of the hose is drastically improved
Data Source
AI summary
A rubber composition having improved electrical insulation properties for reducing galvanic corrosion, a method of preparing the composition, and a rubber hose for vehicles using the composition are disclosed. The rubber composition includes a base polymer, a reinforcing agent, an anti-aging agent, an activating agent, a plasticizer, and a crosslinking agent, and has electrical insulation resistance (107 Ω·cm) of 50 or more.