Magnesium Alloy Sheet Composition to Prevent Micro-Galvanic Corrosion
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Solution Overview
Problem
Magnesium alloys corrode rapidly when exposed to atmosphere or moisture, limiting their application due to insufficient corrosion resistance and toxicity concerns with current additives like As and Sb, and high costs with Y additions.
Innovation Solution
A magnesium alloy sheet composition of 1.0 to 10.5 wt% Al, 0.1 to 2.0 wt% Zn, 0.1 to 2.0 wt% Ca, 0.03 to 1.0 wt% Y, 0.002 to 0.02 wt% Be, with a balance of Mg and inevitable impurities, and a manufacturing method involving homogenizing heat treatment and rolling, which satisfies specific relational expressions for component ratios to enhance corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If As or Sb is added to improve corrosion resistance, then corrosion resistance is improved, but toxicity increases
Solution Approach 1:
The patent replaces toxic elements (As, Sb) with a combination of less toxic elements (Y, Ca, Be, Zn, Al) that achieve corrosion resistance without the harmful effects. This substitution principle eliminates the harmful factor while maintaining the protective function.
2Reliability
If Y element is added to improve corrosion resistance, then corrosion resistance is improved, but cost increases and large amounts are required
Solution Approach 1:
The patent combines Y with Ca, Be, Zn, and Al in specific ratios to achieve synergistic effects. This combination allows for reduced Y content while maintaining or improving corrosion resistance, thereby reducing cost and avoiding the need for large amounts of Y.
Solution Approach 2:
The patent creates a composite alloy system with multiple elements (Y, Ca, Be, Zn, Al) working together to provide corrosion resistance. This composite approach distributes the protective function across multiple elements, reducing dependence on any single element including Y.
3Reliability
If Y element is added to improve corrosion resistance, then corrosion resistance is improved, but price competitiveness deteriorates
Solution Approach 1:
The patent merges Y with more cost-effective elements (Ca, Be, Zn, Al) to achieve the same corrosion protection at lower overall cost. This combination reduces the expensive Y content while maintaining protective performance, improving price competitiveness.
4Weight of moving object
If magnesium alloy is used for weight reduction, then weight is reduced, but corrosion resistance deteriorates
Solution Approach 1:
The patent creates a composite magnesium alloy with multiple protective elements (Y, Ca, Be, Zn, Al) that work synergistically to provide corrosion resistance. This composite formulation maintains the lightweight advantage of magnesium while adding comprehensive corrosion protection through the multi-element 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 alloy composition significantly improves corrosion resistance by controlling component ratios, reducing corrosion rates and preventing micro-galvanic corrosion, while maintaining mechanical properties and cost competitiveness for mass production.
Implementation Method 1
homogenizing heat treatment the casting material
Implementation Method 2
rolling the homogenized heat-treated casting material to manufacture the magnesium alloy sheet
Data Source
AI summary
An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. According to an exemplary embodiment of the present invention, a magnesium alloy sheet including 1.0 to 10.5 wt % of Al, 0.1 to 2.0 wt % of Zn, 0.1 to 2.0 wt % of Ca, 0.03 to 1.0 wt % of Y, 0.002 to 0.02 wt % of Be, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet, may be provided.