Chemical etching, also known as chemical milling or photochemical machining, is a subtractive manufacturing process that involves the controlled dissolution of material from the surface of a substrate using chemical solutions The process begins with the preparation of a mask or a resist that is applied to the surface of the substrate to protect certain areas from being etched The substrate is then immersed in an etchant solution that selectively removes the unprotected areas of the material, leaving behind the desired pattern or design.
The etchant solution used in chemical etching can vary depending on the material being etched what is chemical etching. Common etchants include acids, bases, or a combination of both, which react with the substrate material to dissolve it The etching rate and depth can be controlled by adjusting the concentration of the etchant, the temperature of the solution, and the duration of the etching process.
Applications of Chemical Etching