Can You Etch Metal

Yes, metal can be etched efficiently and accurately using photochemical etching, also known as chemical etching or photochemical machining (PCM). It is a wellestablished subtractive manufacturing process that uses controlled chemical dissolution to remove unwanted metal material, producing precision flat components without mechanical cutting, stamping force or thermal damage.

Not every metal or alloy performs equally during etching. Material chemical composition directly determines etch rate, surface finish, achievable tolerance and production difficulty. Most thingauge rolled metal sheets are suitable for photochemical etching, while some highalloy or heattreated materials require special etchant formulas and adjusted process parameters.

Common Metals That Can Be Etched

Stainless steel (304, 316, 430): The most widely etched material. Suitable for shims, meshes, spring plates, nameplates and automotive parts. Usual working thickness: 0.01 mm1.5 mm.

Spring steel: Good for elastic contact components; strict process control is required to preserve material spring performance after etching.

Copper & brass: Fast etching speed, excellent for EMI shielding parts, conductive gaskets and decorative elements.

Nickel & nickelcobalt alloy: Applied for electroformedcombined components, hydrogenenergy parts and micromesh. Etches slower than stainless steel.

Titanium: Etchable with specialized etchant solutions. Mainly used for medical and newenergy bipolar plates, limited to thickness below 1.2 mm for stable mass production.

Metals That Are Difficult or Not Suitable for Standard Photochemical Etching

Hardened thick tool steel: poor etching uniformity, rough surface finish.

Cast iron and most cast alloys: internal porosity and inconsistent grain structure lead to uneven etching results.

Aluminium: technically etchable, but easy to react violently with common alkaline etchants; requires dedicated bath chemistry and is less frequently selected for highvolume PCM projects.

Typical Capabilities When You Etch Metal

Part forms: throughetched holes, slots, complex outlines, mesh screens, gaskets, shims, encoder discs, nameplates, spring contacts. Partialdepth blind etching can create channels, dimples and surface markings without penetrating the sheet.

Preferred thickness range: 0.01 mm1.5 mm delivers the best dimensional accuracy and surface quality. Thicker sheets up to 2.02.5 mm are possible for certain softer alloys, yet with longer cycle time and increased sideundercut.

Key advantages: burrfree, stressfree parts; no expensive hard stamping dies; easy design revisions; capable of intricate microfeatures that challenge stamping or laser cutting.

Basic Etching Workflow Overview

Analyse customer CAD drawings and complete DFM assessment.

Prepare metal sheets: degreasing and oxide removal.

Laminate dryfilm photoresist on both sides of the metal.

Transfer part patterns by UV exposure and develop to expose areas to be etched.

Sprayetching: chemicals dissolve unprotected metal.

Strip photoresist mask, clean parts, perform secondary finishing and fullrange quality inspection.

Limitations to keep in mind

Photochemical etching is an isotropic process. While etching downwards, it also etches sideways (undercut). This means sharp verticalwalled deep narrow trenches cannot be achieved with standard wet etching. For thick blocks, full 3D geometry or highaspectratio vertical structures, alternative processes such as CNC machining, laser cutting or EDM should be considered.

Industrial Application Scenarios

Etched metal components are widely used across automotive, medical device, semiconductor, optical instrument, hydrogen energy, aerospace and general industrial hardware. If you have custom requirements, submit material grade, sheet thickness and CAD drawings for manufacturability evaluation and quotation.