Dr. Neeraja Kaushik
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Nital is a solution of nitric acid and alcohol commonly used for etching of metals. It is especially suitable for revealing the microstructure of carbon steels. The alcohol can be methanol or ethanol. Mixtures of ethanol and nitric acid are potentially explosive.
Dec 6, 2023 · Nital Etch, also known as Nital Etching, is a widely used technique in the surface finishing process for various industries, including commercial aerospace, defense, space, and satellite industries.
Jun 22, 2018 · Using Nital (2-3% nitric acid in ethanol) to reveal steel microstructure. Loosen cotton swab tip, etch for 30-45 seconds to yield a visibly cloudy surface, d...
Nital (2 to 5 percent) is useful for showing carbide structure in tool and alloy steels, but re-etching the treated sample afterward with Vilella’s darkens the matrix and provides a clearer view of the microstructure.
Introduction. Etching is a process for revealing the structure of the material, common etching techniques include: Chemical. Electrolytic. Thermal. Plasma. Molten salt. Magnetic. The two most common techniques are chemical and electrochemical etching.
Etching Techniques for Ni - base Alloys and Welds. The microstructure of Ni - base welds can be revealed using a variety of etching techniques. Weld metal, the partially melted zone around the weld, and some-times the HAZ, are not homogeneous, so they tend to etch differently than base metals.
The most common etchant for low carbon steels or weld steels is Nital, however, there are a lot of other potential etchant for speicalized etching. A good resouce for additional etchants can be found with the etchant database provided by PACE Technologies.
