Aluminum Compressor with Sacrificial Cladding for Corrosion Resistance
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Solution Overview
Problem
Compressors, particularly those in marine environments or exposed to high temperatures, face corrosion issues that degrade their structural integrity, leading to safety risks, fluid leaks, and environmental concerns, with existing coatings being limited by temperature constraints.
Innovation Solution
A compressor design featuring a cladding of a less noble aluminum alloy over a core, with the cladding comprising an aluminum alloy containing alloying elements like tin, indium, or gallium, providing sacrificial corrosion protection and suitable for high-temperature applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a less noble aluminum alloy cladding is applied over a core, then corrosion resistance is improved through sacrificial protection, but manufacturing complexity increases
Solution Approach 1:
The patent applies a composite material structure consisting of a core aluminum alloy and a less noble aluminum alloy cladding. The cladding contains alloying elements such as zinc (3-10 wt%), magnesium (2-5 wt%), and trace elements (0.01-0.1 wt%) selected from tin, indium, or gallium. This composite structure provides sacrificial corrosion protection where the less noble cladding corrodes preferentially to protect the core, resolving the contradiction between improved corrosion resistance and manufacturing complexity by integrating the protective function into the material composition itself rather than adding separate protective systems.
2Reliability
If organic coatings are used for corrosion protection, then corrosion resistance is improved, but high-temperature operation capability deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of the protective layer from organic coating to metallic cladding. The aluminum alloy cladding with specific composition (containing 3-10 wt% zinc, 2-5 wt% magnesium, and 0.01-0.1 wt% of tin/indium/gallium) provides corrosion protection through galvanic sacrifice and forms stable oxide layers at elevated temperatures. This parameter change enables the compressor to operate at temperatures exceeding 150°C while maintaining corrosion resistance, as the metallic cladding does not suffer from the thermal degradation limitations of organic coatings.
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 solution effectively enhances corrosion resistance and maintains structural integrity, reducing the risk of leaks and environmental impact while operating in challenging conditions.
Implementation Method 1
The second metal is less noble than the first metal and comprises aluminum. The alloying element selected from tin, indium, gallium, or combinations thereof, is present in the second aluminum alloy at a level of between 0.01 wt.% and 0.1 wt.%.
Data Source
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AI summary
A compressor is disclosed, including an outer casing and a fluid guide around a cavity within the casing. An inlet is in operative fluid communication with the cavity, and an outlet is also in operative fluid communication with the cavity. A prime mover includes an actuator disposed in the cavity. The actuator includes a surface arranged to receive fluid in the cavity from the inlet, impart compression to received fluid in the cavity, and discharge compressed fluid to the outlet. A surface of the compressor includes a cladding of a second aluminum alloy over a core of a first aluminum alloy, wherein the second aluminum alloy is less noble than the first aluminum alloy and includes an alloying element selected from tin, indium, gallium, or combinations thereof.