Understanding the Process
What is Chemical Etching?
Chemical etching, also known as photochemical machining, is a subtractive manufacturing process that uses chemical solutions to selectively remove material from a workpiece. Unlike mechanical machining, it relies on chemical reactions rather than physical force, allowing for the creation of intricate, burr-free features without inducing stress in the material.
The process begins with cleaning the workpiece and applying a photosensitive resist coating. A mask with the desired pattern is then placed over the resist, and the workpiece is exposed to UV light, which hardens the resist in unmasked areas. After developing to remove the unhardened resist, the workpiece is immersed in an etching solution (like ferric chloride for metals), which dissolves the exposed material. Finally, the remaining resist is stripped to reveal the finished part.
Chemical etching is ideal for producing thin, complex components with fine features down to 0.1 mm in size, such as heat exchangers, electronic connectors, and precision metal screens. It works with a wide range of materials, including stainless steel, copper, brass, and titanium, and maintains consistent accuracy across large production runs. Its ability to create uniform features on both sides of a part makes it a preferred method for industries like aerospace, medical, and electronics.
