Magnesium Alloy Surface Coloring via Pulse Anodizing and Etching
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Solution Overview
Problem
The existing surface treatment methods for magnesium alloy articles, such as anodizing, result in uneven dye penetration and insufficient dyeing depth due to irregularly distributed pores, which affects the appearance and decorative properties of the material.
Innovation Solution
A surface coloring method involving a pulse-type anodizing treatment to form a uniform anodized layer with regularly arranged pores, followed by an etching treatment to create pits connected to the pores, and a sealing treatment with a resin composition to enhance light interference and dye absorption, resulting in improved dyeing effects and decorative properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical anodizing treatment is performed to form a porous anodized layer, then the magnesium alloy surface is protected and decorated, but the pores are unevenly distributed resulting in uneven dyeing
Solution Approach 1:
The patent employs pulse anodizing with periodic voltage application (on-time and off-time cycles) to control pore formation. The periodic electrical action allows for controlled growth and dissolution cycles that result in uniformly distributed pores throughout the anodized layer, resolving the uneven pore distribution issue while maintaining protective and decorative functions
Solution Approach 2:
The patent modifies anodizing parameters including voltage amplitude, frequency, duty cycle, and electrolyte composition to achieve uniform pore distribution. By optimizing these parameters, the anodized layer forms with consistent pore size and spacing, enabling uniform dye penetration while maintaining corrosion protection and surface decoration
2Ease of manufacture
If a typical anodizing treatment is performed to form a porous structure, then the surface can be colored, but the porous structure does not allow for effective dye penetration resulting in insufficient dyeing depth
Solution Approach 1:
The patent creates a multi-dimensional pore structure by controlling pore depth and diameter ratios, and by forming interconnected pore networks. This dimensional optimization allows dye molecules to penetrate deeper into the anodized layer while maintaining sufficient porosity for effective dye absorption, achieving both surface coloring and deep penetration
Solution Approach 2:
The patent forms a hierarchical pore structure where smaller pores are nested within larger pore channels, creating a multi-level penetration pathway. This nested architecture allows dye to progress through multiple levels of the anodized layer, achieving deep and uniform color penetration while maintaining the porous structure's coloring capability
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 achieves clear and perceptible interference colors and deeper, more uniform dyeing, enhancing the decorative and appearance properties of magnesium alloy surfaces by forming a uniform anodized layer with connected pits and sealing the pores.
Implementation Method 1
performing an anodizing treatment on the magnesium alloy article to form an anodized layer on an outer surface of the magnesium alloy article
Implementation Method 2
performing an anodizing treatment on the magnesium alloy article to form an anodized layer on an outer surface of the magnesium alloy article
Implementation Method 3
performing an etching treatment on the anodized layer to form a plurality of pits on a surface of the anodized layer
Implementation Method 4
performing a sealing treatment on the anodized layer after the etching treatment. The sealing treatment is to cover the surface of the anodized layer with a sealing layer through electrical hole-sealing
Implementation Method 5
improve a light interference coloring effect
Data Source
AI summary
A surface coloring method of a magnesium alloy article includes: performing an anodizing treatment on the magnesium alloy article to form an anodized layer having a plurality of pores on an outer surface of the magnesium alloy article; performing an etching treatment on the anodized layer to form a plurality of pits on a surface of the anodized layer that is distant from the magnesium alloy article, in which each of the plurality of pits is in spatial communication with at least one of the plurality of pores; and performing a sealing treatment on the anodized layer after the etching treatment, so that a sealing layer is formed to seal the plurality of pores on the anodized layer. By using the surface coloring method, a surface-colored magnesium alloy article is also provided.