Mg-Li Alloy Bonding with Porous Anti-Corrosion Film Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnesium-lithium alloys bonded with a bonding resin form a fragile layer at the interface, leading to insufficient adhesive strength and potential peeling of the resin coating.
Innovation Solution
An alloy member with a base containing magnesium and lithium, and an anti-corrosion film made of magnesium, phosphorus, and fluorine, featuring recesses to enhance adhesion, is bonded using a high-viscosity adhesive that fills these recesses, forming a bonded body with improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a bonding resin is used to bond magnesium-containing alloy members, then weight reduction is achieved, but a fragile layer forms at the interface leading to insufficient adhesive strength
Solution Approach 1:
An anti-corrosion film is formed on the alloy member surface before bonding, with a porous layer containing pre-formed recesses. This preliminary surface treatment creates an optimized substrate that enhances subsequent adhesive bonding, preventing the formation of fragile interfaces while maintaining weight reduction benefits.
Solution Approach 2:
A porous anti-corrosion film with controlled pore structure is applied to the alloy member surface. The porous layer with recesses increases surface area and provides mechanical interlocking for the bonding resin, significantly improving adhesive strength while maintaining the lightweight characteristic of magnesium alloys.
2Strength
If a porous magnesium oxide layer is formed by micro arc oxidation treatment, then adhesive strength is improved, but the pore size is insufficiently large leading to resin coating peeling
Solution Approach 1:
The pore size and porosity parameters of the anti-corrosion film are optimized to create recesses with dimensions suitable for bonding resin penetration. By controlling the pore size to be sufficiently large, the film maintains both high adhesive strength and prevents resin coating peeling, resolving the reliability issue.
Solution Approach 2:
The anti-corrosion film exhibits non-uniform local structure with recesses of varying sizes distributed across the surface. These localized features provide optimal bonding sites for the resin while maintaining overall film integrity, preventing peeling by ensuring proper resin anchoring in critical areas.
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 bonded body achieves enhanced adhesive strength and durability by increasing the contact area between the anti-corrosion film and the bonding resin, preventing peeling and ensuring robust bonding.
Implementation Method 1
Japanese Patent Application Laid-Open No. 2007-308757 discusses a technique for improving the adhesive strength by forming a porous magnesium oxide layer on the surface of an alloy consisting mainly of magnesium by a micro arc oxidation treatment, which is one of anodization treatments.
Implementation Method 2
forming a porous magnesium oxide layer on the surface of an alloy consisting mainly of magnesium by a micro arc oxidation treatment
Implementation Method 3
a part of the bonding resin is located in the first recess and the second recess
Data Source
AI summary
An alloy member includes a base containing magnesium and lithium, and an anti-corrosion film disposed on the base, the anti-corrosion film containing magnesium, phosphorus, and fluorine. The anti-corrosion film includes at least one first recess in a surface on a side opposite the base. A surface of the at least one first recess includes at least one second recess smaller than the at least one first recess.