Educational Etchant and Procedures Database CD


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  • Etchant Database - OVER 2000 ETCHANTS Search Fields
  • Material or metal type
  • Specific alloys
  • Etchant name
  • Micro vs. Macro etchant
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  • COMMON ETCHANTS

    CAUTION: Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters MSDS. Also review COMMENTS Section for each etchant.


    The following table lists the most commonly used etchants.

    Etchant

    Composition

    Conc.

    Conditions

    Comments

    Kalling's No. 1

    Distilled water
    CuCl2
    Hydrochloric acid
    Ethanol

    33 ml
    1.5 grams
    33 ml
    33 ml

    Immersion etching at 20 degrees Celcius

    For etching martensitic stainless steels. Martensite will be dark and the ferrite will be colored.

    Kalling's No. 2

    CuCl2
    Hydrochloric acid
    Ethanol

    5 grams
    100 ml
    100 ml

    Immersion etching at 20 degrees Celcius

    For etching duplex stainless steels and Ni-Cu alloys and superalloys.

    Kellers Etch

    Distilled water
    Nitric acid
    Hydrochloric acid
    Hydrofluoric acid

    190 ml
    5 ml
    3 ml
    2 ml

    10-30 second immersion. Use only fresh etchant

    Excellent for aluminum and alloys - immersion for 10-20 seconds ; titanium alloys immersion for 10-20 seconds.

    Kroll’s Reagent

    Distilled water
    Nitric acid
    Hydrofluoric acid

    92 ml
    6 ml
    2 ml


    15 seconds

    Excellent for titanium and alloys. Swab specimen up to 20 seconds.

    Nital

    Ethanol
    Nitric acid

    100 ml
    1-10 ml

    Seconds to minutes

    Most common etchant for Fe, carbon and alloys steels and cast iron - Immerse sample up from seconds to minutes; Mn-Fe, MnNi, Mn-Cu, Mn-Co alloys - immersion up to a few minutes.

    Marble's Reagent

    CuSO4
    Hydrochloric acid
    Water

    10 grams
    50 ml
    50 ml

    Immerse or swab for 5-60 seconds.

    For etching Ni, Ni-Cu and Ni-Fe alloys and superalloys. Add a few drops of H2SO4 to increase activity.

    Murakami's

    K3Fe(CN)6
    KOH
    Water

    10 grams
    10 grams
    100 ml

    Pre-mix KOH and water before adding K3Fe(CN)6

    Cr and alloys (use fresh and immerse); iron and steels reveals carbides; Mo and alloys uses fresh and immerse; Ni-Cu alloys for alpha phases use at 75 Celcius; W and alloys use fresh and immerse; WC-Co and complex sintered carbides.

    Picral

    Ethanol
    Picric acid

    100 ml
    2-4 grams

    Seconds to minutes
    Do not let etchant crystallize or dry –explosive

    Recommended for microstructures containing ferrite and carbide.

    Vilella’s Reagent

    Glycerol
    Nitric acid
    Hydrochloric acid

    45 ml
    15 ml
    30 ml

    Seconds to minutes

    Good for ferrite-carbide structures (tempered martensite) in iron and steel


    Etchant and Specimen Preparation CD

    Product Quantity Price Cat. No.
    Ethant and Specimen Preparation CD $150.00 CD-ETCH


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