Chemical Etching Process
Автор: Kong Kea
Загружено: 2025-11-21
Просмотров: 23
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The Chemical Milling Process
The process typically involves a sequence of meticulously controlled steps:
Cleaning: The workpiece is thoroughly cleaned using solvents or specialized solutions to remove all surface contaminants (like oil, grease, scale, or dirt). This is crucial for proper adhesion of the maskant and uniform etching.
Masking: A protective, chemically resistant coating, known as the maskant (often a polymer or photoresist), is applied to all areas of the workpiece that should not be etched.
Scribing: The maskant is selectively removed from the areas to be machined (etched). This can be done manually using a scribing knife with a template or, for high precision, using automated processes like computer numerical control (CNC) or photolithography (in the case of Photochemical Machining).
Etching: The masked workpiece is immersed in a bath of the temperature-regulated etchant solution. The etchant reacts with and dissolves the exposed material (unmasked areas) at a uniform, consistent rate. The depth of the cut is directly controlled by the immersion time.
Demasking: Once the desired depth or shape is achieved, the part is removed, washed to neutralize and remove the etchant, and the remaining maskant is stripped away to reveal the finished component.
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