Variable Thickness Corrosion Coating for Aircraft Heat Exchangers
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Solution Overview
Problem
Heat exchangers in aircraft thermal management systems face corrosion issues due to exposure to corrosive air, leading to potential leaks and reduced thermal management control, with existing corrosion-resistant coatings increasing weight and processing time.
Innovation Solution
A heat exchanger with a variable thickness corrosion-resistant coating, thicker at susceptible areas and thinner where corrosion is less likely, applied using an electrodeposition technique, reducing weight and processing time while maintaining effective corrosion protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform thickness corrosion-resistant coating is applied to the heat exchanger wall, then corrosion protection is provided, but weight increases and processing time increases
Solution Approach 1:
The coating thickness is varied locally based on corrosion susceptibility. Areas more susceptible to corrosion receive thicker coating layers, while areas with lower corrosion risk receive thinner layers. This local differentiation provides adequate protection where needed while reducing unnecessary material and weight in less critical areas.
Solution Approach 2:
The coating parameter (thickness) is changed across different locations of the heat exchanger wall. By modifying the thickness parameter from uniform to variable, the system achieves optimized corrosion protection that reduces overall material consumption and weight while maintaining reliability in critical areas.
2Reliability
If a uniform thickness corrosion-resistant coating is applied to the heat exchanger wall, then corrosion protection is provided, but processing time increases
Solution Approach 1:
The coating process is optimized by applying different thicknesses to different areas based on their corrosion susceptibility. This local quality approach allows the coating process to be more efficient by not over-coating areas that don't require thick protection, thereby reducing overall processing time while maintaining adequate protection.
Solution Approach 2:
Instead of applying excessive coating thickness uniformly across the entire heat exchanger wall, the invention applies partial or excessive action only where truly needed. Areas with lower corrosion risk receive thinner coatings, reducing the total coating application time and material usage while still providing sufficient protection.
3Reliability
If a variable thickness coating is applied with thicker coating at susceptible areas, then corrosion protection is optimized, but coating complexity increases
Solution Approach 1:
The variable thickness coating system uses local quality principles to simplify the overall design by focusing complexity only where necessary. The coating thickness is differentiated based on local corrosion susceptibility, which can be determined through standard engineering analysis, rather than requiring complex variable geometry throughout the entire structure.
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 variable thickness coating provides superior corrosion resistance at critical areas while reducing weight and processing time, achieving a 1.5-pound weight reduction and improved heat transfer with reduced material consumption and costs.
Implementation Method 1
applied using an electrodeposition technique
Data Source
AI summary
A heat exchanger includes a heat exchanger wall that bounds a passage. A coating lines the heat exchanger wall. The coating has a thickness that varies according to location on the heat exchanger wall.