Chemical Etching Process In A Nutshell

By Author: Michale Horton
Total Articles: 94
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Chemical Etching is the process of engraving designs, removing excess materials, and smoothing edges of metal and metallic materials using chemicals such as alkaline and acids. This intricate and very delicate process dates back to Medieval and Renaissance era where soldiers etch their helmets, armors, blades, spears, and shields with designs and information using solvents derived from mixed vinegar, charcoal, and lime.

Chemical Etching in the past eras also elevated the standards of metal sculpturing. During the Renaissance period, Baroque artists use the same principle in carving out intricate vine and grape designs on metal thrones, canopies, brass knobs, handles, utensils, and many more. Metal carving and sculpturing flourished that time.

Chemical Etching is a lot different from ordinary metal sculpturing using carving tools. Usually, the material to be carved had to be softer than the carving tool. This is not possible for war tools that needed to be durable and heavy resistant. Moreover sculpting and carving tools often leave burrs, stresses, dents, and bumps on the material. It ruins the general design ...
... of the product. Moreover, Chemical Etching is best suited for intricate and very minute details. It allows the sculptor or the carver to control the depth of the etchings and the surface is kept smooth and free of excess materials.

Today, polished, highly-complicated, and minimal etchings are in great demands in the electronics manufacturing industries. Circuit boards, electric panels, circuitries and many other electronic parts and devices use Chemical Etching. Chemical etching is five-way process that involves careful analysis and computation of variables.

The first step is called cleaning. In this process, the metal plate or the material to be subjected for Chemical Etching is submerged on a mild solvent that removes all forms of impurities and contaminants that may affect the final result of the etching process.

Second is the masking. The maskant, a chemical that has the appropriate inert property to resist the etchant, the chemical that do the etching process, is applied on the entire surface to be treated. There can be several ways to apply the maskant. The object or the surface may be submerged or the maskant is sprayed all over the material. This depends on the chemical property of the maskant and the type of chemical etching to be made.

Third is the scribing procedure. On this procedure, the maskant is removed on specific areas using either a template or a numerator-controlled machine. This is crucial and very delicate as the areas without the maskant will be chemical etched.

Then fourth is the etching. On this process, the entire material is then submerged on the etchant. The submersion period and the etching rates are pre-computed experimentally before this procedure is conducted. This is crucial as the time of submersion and the etching rate will determine the depth and intensity of etching.

Lastly, is the de-masking. This is the removal of the maskant applied. Using a different type of solvent that is not corrosive or does not have any effect on the material, the object is washed down.

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