Dissimilar Metal Panel Assembly With Spacing Part Against Galvanic Corrosion
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Solution Overview
Problem
The assembly of different types of metal panels in vehicle bodies, such as steel and nonferrous panels, leads to galvanic corrosion due to potential differences between the materials, increasing the number of assembly processes and costs.
Innovation Solution
A structure and method for assembling metal panels that includes a steel panel, a nonferrous panel, a spacing part joined to the steel panel to maintain separation, and a flange bolt to fasten the panels together, preventing direct contact and potential corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cap is fitted on the bolt or wax is applied between panels to prevent galvanic corrosion, then corrosion protection is improved, but the number of assembly processes increases and costs increase
Solution Approach 1:
The spacing part integrates both the corrosion protection function and the structural spacing function into a single component. By combining the anti-corrosion feature with the spacing function, the patent eliminates the need for separate protective measures like caps or wax, thereby reducing assembly processes while maintaining corrosion protection.
Solution Approach 2:
The spacing part is designed to automatically prevent galvanic corrosion through its inherent structure and material properties without requiring additional protective materials or processes. The component serves itself by providing both mechanical spacing and corrosion protection simultaneously, eliminating dependency on external protective measures.
2Reliability
If a cap is used to prevent moisture penetration, then galvanic corrosion is prevented, but the assembly process becomes more complex and costly
Solution Approach 1:
The spacing part merges moisture protection functionality with its primary structural role. The integrated design provides both spacing and moisture barrier functions in one component, eliminating the need for separate caps or coatings and thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The spacing part is designed as a simple, cost-effective component that provides durable moisture protection without requiring expensive materials or complex manufacturing processes. By using a straightforward structural solution rather than sophisticated protective systems, the patent reduces manufacturing costs while maintaining effective moisture protection.
3Reliability
If wax is applied between panels to prevent direct contact, then galvanic corrosion is prevented, but the protective effect degrades over time and additional processes are required
Solution Approach 1:
The spacing part combines permanent structural spacing with corrosion protection in a single durable component. Unlike temporary wax coatings, the integrated spacing part provides lasting protection that does not degrade over time, maintaining both its mechanical and protective functions throughout the service life of the vehicle body.
Solution Approach 2:
The spacing part provides self-sustaining corrosion protection through its inherent structural design and material properties. It does not rely on degradable coatings or temporary measures but maintains its protective capability permanently through its own structural integrity, eliminating the need for periodic maintenance or replacement of protective layers.
Data Source
AI summary
An embodiment structure for assembling different types of metal panels includes a steel panel, a nonferrous panel assembled to the steel panel, a spacing part joined to the steel panel and spacing apart the steel panel from the nonferrous panel, and a flange bolt penetrating the nonferrous panel and fastening the steel panel to the nonferrous panel.