Nickel etching (photochemical etching of nickel) is a subtractive manufacturing process that uses controlled chemical etchants to selectively remove material from thin nickel sheets. It creates intricate, high-precision nickel components without mechanical contact, eliminating burrs and material stress that are common in stamping or laser cutting.

How Nickel Etching Works

1. Material Preparation: Clean nickel sheet to remove oil, oxide and contaminants, ensuring photoresist adheres uniformly.
2. Photoresist Lamination: Apply light-sensitive photoresist film onto both sides of the nickel substrate.
3. UV Exposure: Align the custom CAD phototool and expose the sheet under UV light, hardening the resist in the non-etch areas.
4. Development: Wash away unexposed photoresist, revealing the nickel areas to be etched.
5. Chemical Etching: Immerse the workpiece in nickel-specific etching chemistry. Exposed nickel dissolves evenly, while resist-protected regions remain intact.
6. Stripping: Remove the remaining photoresist film.
7. Final Inspection & Packaging: Dimensional check, surface inspection and cleaning before delivery.

Core Advantages of Nickel Etching

• Burr-free & stress-free: No mechanical impact, so nickel retains its original material properties, no deformation.
• High precision micro features: Capable of fine slots, holes and complex geometries, minimum feature size can match material thickness.
• No hard tooling: Only digital phototools required, low cost for prototypes and small-to-medium batch runs, fast turnaround.
• Uniform etch across thin nickel foils: Works well for ultra-thin nickel sheets commonly used in electronic shielding and battery components.
• Design flexibility: Modify CAD drawings quickly without expensive tool rework.

Typical Application Fields

• EMI/RFI shielding frames and shielding gaskets for consumer electronics
• Battery current collectors and fuel cell nickel components
• Precision spring contacts, electrical connectors and lead frames
• Aerospace and sensor thin nickel parts
• Fine nickel mesh, filters and custom screens

Design Considerations for Nickel Etching

• Nickel has different etching rates compared to stainless steel or copper; chemical bath parameters must be strictly controlled.
• Material thickness affects minimum hole width and line width. General rule: the smallest feature should not be less than the sheet thickness.
• Surface finish can be customized, but nickel tends to oxidize easily, so post-passivation or anti-tarnish treatment is available upon request.
• Nickel alloy variants (pure nickel, nickel iron alloys) require adjusted etchant formulas, confirm material grade before production.