Etching reagent for carbon steels

Q.  Which of the following is an etching reagent used for carbon steels?
- Published on 11 Sep 15

a. Nitric acid
b. Picric acid
c. Both a. and b.
d. None of the above

ANSWER: Both a. and b.


  • Sravanthi   -Posted on 20 Nov 15
    - Nitric acid and Picric acid both are used as etching reagents for carbon steels.

    - Etching is carried out after polishing the surface. Chemical actions are performed on the polished surface by using an appropriate etching reagent, to make structural characteristics of metals and alloys visible.

    - This process is carried out by immersing polished surface in reagents such as nitric or picric for carbon steels. The etching reagent nitric acid consists of white nitric acid of 1 to 5 ml, ethyl or methyl alcohol upto 100 ml.

    - Ferric chloride and hydrochloric acid are used as etching reagents for austenitic nickel stainless steel.

    - The different types of etching reagents used are ammonium hydroxide and hydrogen peroxide, ammonium per sulphate, palmerton reagent, hydrofluoric acid, etc.

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