Question

Why etching is done in metallographic tests to reveal the microstructure of a specimen under the optical microscope by achieving contrast in the microstructure. To remove the deformations from grinding and obtain a surface that is highly reflective. To determine the type and rate of corrosion. All of these?

Answer 1

Answer:

Etching Is a Chemical or Electrolytic Process Used after Metallographic Grinding and Polishing Procedures.

Etching Enhances the Contrast on Surfaces in Order to Visualize the Microstructure or Macrostructure.

Etching in materialography exerts a controlled influence on the surface profile or optical properties at grain boundaries, phases, or grain surfaces, thus enabling microscopic inspection and additional use of optical filters in the microscope. Preparation before the etching process must be adapted to the investigation target.