What Is the Chemical Etching Process?

The chemical etching process, also called photochemical machining (PCM), is a precise and cost-effective method of manufacturing complex metal components. It involves selectively removing metal using chemical solutions to create detailed and burr-free patterns—without mechanical force or heat.

Step-by-Step Chemical Etching Process

1. Material Selection: Choose a suitable metal such as stainless steel, copper, aluminum, nickel, or titanium.
2. Surface Cleaning: Clean the metal sheet to eliminate oils, oxides, or contaminants for optimal adhesion of photoresist.
3. Photoresist Coating: Apply a UV-sensitive photoresist film evenly over the metal surface.
4. UV Exposure: Place a photomask with the desired pattern over the sheet and expose it to ultraviolet light.
5. Development: Develop the exposed photoresist to remove either the exposed or unexposed areas, depending on whether positive or negative resist is used.
6. Chemical Etching: Immerse the sheet in an etching solution—commonly ferric chloride—to dissolve the unprotected metal areas.
7. Stripping: Remove the remaining photoresist, revealing the final etched part with precision detail.

Benefits of the Chemical Etching Process

• Highly accurate with tolerances up to ±0.01mm
• Stress-free and burr-free edges
• No deformation or mechanical distortion
• Rapid prototyping and scalable production
• Cost-effective for complex or thin components

Common Applications

The chemical etching process is widely used across industries:

• Automotive: Speaker grilles, battery heating films, bipolar plates
• Electronics: EMI shields, filters, circuit components
• Aerospace & Medical: Precision metal structures and devices

Why Work With Guangdong Zhuanjing?

Guangdong Zhuanjing is a leading manufacturer specializing in high-precision chemical etching. With 18 advanced etching lines and over 20,000㎡ of production space, we support full in-house processing and strict quality control. Certified with IATF16949 and ISO9001, we ensure reliability from prototype to mass production.

Request a Quote or Consultation

Looking for a reliable partner in precision chemical etching? Contact us today to learn how we can support your project with customized metal solutions.