Acid etching, also known as chemical etching, is a subtractive manufacturing method that selectively removes material from thin metal sheets via controlled chemical corrosion. The process is stress-free and generates zero burrs, making it ideal for critical satellite components. Satellite hardware demands ultra-consistent dimensions, stable material properties and low residual stress to withstand extreme space environments, including thermal cycling, vacuum and radiation. Acid etching supports prototype validation and serial production of lightweight aerospace metal components for communication satellites, navigation satellites and remote sensing platforms.

Process Flow

1. Raw material selection & cleaning: Choose aerospace-grade metal foils, remove surface grease, oxides and contaminants.
2. Photoresist coating & exposure: Apply photoresist film, expose the component pattern under UV light.
3. Development: Wash away unexposed photoresist to expose the metal areas to be etched.
4. Acid etching: Immerse or spray controlled acid etchant to dissolve the uncovered metal and form the required geometry.
5. Stripping: Remove remaining photoresist protective layer after etching completion.
6. Post-treatment: Precision cleaning, surface passivation, dimensional and material inspection.
7. Aerospace qualification testing: Thermal cycle, vacuum and material certification for space application.

Core Advantages

1. Stress-free machining: No mechanical force or thermal impact, retains original material properties, avoids component deformation under space temperature fluctuation.
2. Burr-free edges: Eliminates secondary deburring, prevents tiny metal particles that may cause short circuits inside satellite payloads.
3. Lightweight thin metal fabrication: Works well on ultra-thin sheets, helps reduce satellite overall weight and cut launch costs.
4. High repeatability: Consistent dimensional accuracy across large batches, suitable for multi-unit satellite constellation projects.
5. Complex micro patterns: Easily produces intricate meshes, thin spacers, RF shielding parts and micro spring structures.

Application Fields

• RF electromagnetic shielding sheets for satellite communication payloads
• Precision filter meshes for satellite propulsion and fluid management systems
• Thin gauge shims and spacer plates for satellite assembly alignment
• Micro spring contacts and electrical connection components
• Thermal management thin metal structures and radiation shielding foils

Design Considerations

1. Select space-qualified alloys such as stainless steel, kovar, copper and nickel; material certification documentation is mandatory.
2. Etch factor limits aspect ratio; deep structures require careful thickness and pattern layout optimization.
3. Strict post-cleaning is required to fully remove residual etchant, to avoid long-term corrosion in vacuum space environment.
4. Design must take thermal expansion characteristics of metal into account for on-orbit temperature cycling.
5. Feature size tolerance will vary with sheet thickness; consult engineers early during design phase.