Aerospace components etching mainly refers to photochemical / acid etching, a subtractive manufacturing process that selectively removes material from thin metal sheets via controlled chemical corrosion. Without mechanical cutting force or thermal damage, this technology keeps the base metal’s original mechanical properties, which is critical for aviation and space industries. Aerospace parts must withstand extreme conditions: drastic thermal cycling, high vacuum, vibration, radiation and pressure changes. Etching is widely adopted across commercial aviation, military aircraft, launch vehicles and satellite platforms, supporting prototype development and mass production of thin, complex micro-components.

Process Flow

1. Material selection & surface cleaning: Use aerospace certified alloys, remove oil, oxide and surface contaminants.
2. Photoresist lamination: Apply dry film photoresist evenly on the metal sheet surface.
3. UV exposure: Transfer part CAD patterns onto photoresist under ultraviolet light.
4. Development: Strip unexposed photoresist to expose metal regions ready for etching.
5. Chemical etching: Spray etchant to dissolve uncovered metal and form target geometry.
6. Photoresist stripping: Remove protective resist film after etching.
7. Post processing: Precision cleaning, passivation, dimensional inspection and material qualification testing.

Core Advantages

1. Zero residual stress: No mechanical impact during processing, preventing part deformation under aerospace alternating temperature loads.
2. Burr-free edges: No secondary deburring required, eliminating metal debris risk for sensitive avionics and space payloads.
3. Excellent repeatability: Consistent dimensional accuracy for batch production of aircraft and space hardware.
4. Lightweight thin metal fabrication: Ideal for ultra-thin foils, helping reduce overall system weight and save fuel / launch cost.
5. High design flexibility: Quick pattern revisions, suitable for aerospace R&D iteration and custom low-volume orders.

Application Fields

• Aircraft avionics: RF shielding sheets, EMI shielding foils for onboard electronic modules
• Engine & fluid systems: Precision filter meshes, fluid restrictors and fuel monitoring micro components
• Aircraft assembly: Custom thin shims, spacer plates for alignment and gap compensation
• Aerospace electrical systems: Micro spring contacts, electrical connectors and contact springs
• Satellite & rocket payloads: Thermal control metal foils, radiation shielding parts, micro structural components
• Helicopter and defense aerospace: Lightweight micro grids, pressure sensing diaphragms

Design Considerations

1. Materials must meet aerospace industry standards, including stainless steel, Kovar, copper, nickel, phosphor bronze, with full material traceability.
2. Etch factor restricts structure aspect ratio; deep features need early design optimization.
3. Thorough cleaning is mandatory to eliminate residual etchant, preventing long-term corrosion in service.
4. Thermal expansion differences between materials should be considered when designing multi-component assemblies.
5. Minimum line width and tolerance depend on raw sheet thickness; consult manufacturing engineers at the design stage.