Magnesium Alloy Casing Coating for Corrosion Protection and Metallic Texture
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Solution Overview
Problem
The challenge in manufacturing magnesium alloy casings is maintaining the metallic texture while applying protective films and coatings, as the surface layers obscure the metallic appearance.
Innovation Solution
A manufacturing method involving micro-arc oxidation or conversion coating followed by grinding, cutting, or engraving treatments to create a concave-convex surface, then applying a transparent conductive film and light-transmissive electrophoretic coating layer to maintain the metallic texture and allow light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple film layers (protective film, paint spraying, film coating) are applied to the magnesium alloy casing surface, then corrosion protection is improved, but the metallic texture of the casing is lost
Solution Approach 1:
The patent applies a light-transmissive coating layer that allows light to pass through and reflect off the metallic substrate, creating a visual effect that preserves the metallic texture appearance while providing corrosion protection. This optical property change enables the coating to be transparent or translucent rather than opaque, maintaining the underlying metal's aesthetic qualities.
Solution Approach 2:
The patent introduces an intermediate layer structure between the magnesium alloy substrate and the outer coating layers. This intermediate layer serves as a mediator that allows light transmission while providing adhesion and corrosion resistance, enabling the outer coating to protect the metal without completely obscuring its metallic appearance.
2Reliability
If a protective film is formed on the magnesium alloy substrate, then corrosion resistance is improved, but the surface becomes less reflective and metallic appearance is reduced
Solution Approach 1:
The protective film is designed with light-transmissive properties, allowing it to change from an opaque barrier to a transparent or translucent layer that permits light transmission. This enables the film to provide corrosion protection while maintaining the reflective and metallic visual characteristics of the underlying substrate.
3Shape
If grinding, cutting, or engraving treatments are performed to remove portions of the protective film and substrate, then metallic texture is restored, but manufacturing complexity increases
Solution Approach 1:
The patent applies the light-transmissive coating layer before final surface finishing operations. This preliminary action allows the coating to be deposited over the entire surface uniformly, and subsequent grinding, cutting, or engraving operations can then selectively remove portions of the coating and substrate to reveal metallic texture in specific areas, simplifying the overall process compared to attempting to apply coating only to specific areas first.
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 method allows for an easy and effective process to maintain the metallic texture and luster of magnesium alloy casings by forming a protective film and light-transmissive coating layer that enhances adhesion and allows light reflection, while preventing corrosion.
Implementation Method 1
An electrophoretic coating treatment is performed afterwards to form a light-transmissive coating layer covering the protective film and the magnesium alloy substrate.
Implementation Method 2
the surface of the magnesium alloy casing is required to be treated through the micro-arc oxidation treatment or the conversion coating treatment to form a protective film on the surface
Implementation Method 3
a transparent conductive film and light-transmissive electrophoretic coating layer to maintain the metallic texture and allow light reflection
Data Source
AI summary
A manufacturing method of a casing including the following steps is provided. A magnesium alloy substrate is provided first. Next, a protective film is formed on the magnesium alloy substrate. A grinding treatment, a cutting treatment, or an engraving treatment is then performed to remove portions of the protective film and portions of the magnesium alloy substrate. An electrophoretic coating treatment is performed afterwards to form a light-transmissive coating layer covering the protective film and the magnesium alloy substrate. A casing is also provided.