Mg-Li Alloy Sliding Member Coating for Corrosion-Resistant Adhesion
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Solution Overview
Problem
Magnesium-lithium-based alloys suffer from poor adhesion of chemical conversion films, leading to peeling issues, which compromises their corrosion resistance and durability, especially when used in applications requiring sliding or vibration-damping properties.
Innovation Solution
A method involving the formation of a substrate with a magnesium-lithium alloy, followed by creating a first layer with an inorganic fluoride film having an irregular structure and pores, and a second layer with a cured resin, enhancing adhesion through an anchor effect, thereby improving corrosion resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chemical conversion film is formed on a Mg-Li-based alloy surface using a fluoride treatment solution, then corrosion resistance is improved, but adhesion between the chemical conversion film and the alloy substrate deteriorates
Solution Approach 1:
The patent introduces an intermediary layer (irregular structure layer) between the chemical conversion film and the alloy substrate. This intermediary layer acts as a mediator that enhances adhesion while maintaining the corrosion resistance provided by the chemical conversion film. The irregular structure creates mechanical interlocking, preventing peeling while preserving the protective function of the fluoride-based chemical conversion film.
Solution Approach 2:
The patent employs a porous or irregular structure in the intermediate layer formed on the alloy substrate before applying the chemical conversion film. This porous structure increases the surface area and creates anchoring points that significantly improve adhesion strength. The irregular structure allows the chemical conversion film to mechanically interlock with the substrate, preventing peeling while maintaining corrosion resistance.
2Reliability
If a coating film is applied on a chemical conversion film of Mg-Li-based alloy, then corrosion protection is enhanced, but the coating film and chemical conversion film peel off due to insufficient adhesion
Solution Approach 1:
The irregular structure layer serves as an intermediary between the alloy substrate and the chemical conversion film, and indirectly between the chemical conversion film and the coating film. This intermediary structure ensures strong bonding throughout the entire layered system, preventing peeling between any interfaces while maintaining enhanced corrosion protection through the coating film.
Solution Approach 2:
The patent creates a composite layered structure consisting of the alloy substrate, irregular structure layer, chemical conversion film, and coating film. Each layer contributes different properties: the alloy provides structural integrity, the irregular structure layer provides adhesion, the chemical conversion film provides corrosion resistance, and the coating film provides additional protection. This composite structure solves the peeling problem by ensuring strong inter-layer bonding throughout the system.
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 approach results in an alloy member with high adhesion between layers, reducing corrosion and enhancing abrasion resistance, making it suitable for lightweight, durable applications such as electronic and optical components.
Implementation Method 1
a first layer which is disposed on the substrate and contains an inorganic fluoride... a voltage application step of applying a voltage between the anode and the cathode to form a first layer which has an irregular structure on a surface thereof and contains an inorganic fluoride
Implementation Method 2
a second layer which is disposed on the first layer and includes a cured product of a resin... a curing step of curing the resin to form a second layer including a cured product of the resin
Data Source
AI summary
An alloy member includes a substrate formed of an alloy containing Mg and Li, a first layer which is disposed on the substrate and contains an inorganic fluoride, and a second layer which is disposed on the first layer and includes a cured product of a resin, the substrate, the first layer, and the second layer being stacked together, in which a surface of the first layer on the side opposite the substrate has an irregular structure.