Originally approved in Last previous edition approved in as E–99 DOI: /E 2 For referenced ASTM standards. ASTM E()e1. Standard Practice for Microetching Metals and Alloys. standard by ASTM International, 06/01/ View all product details. Determination of Residual Stresses Numerically Obtained in ASTM AH36 Steel Welded by TIG Process. Pablo Batista Guimarães, Paulo.
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Electrolytic at 80 V for 5—30 min. See Guide E on Metallographic Laboratory Safety for additional information on safety precautions for electrolytes containing perchloric acid.
Properly discard before solution attains a dark orange color.
Etch time varies with material. The HF may be varied to give more or less etching. The specimen is examined as polished under polarized light.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
Use fresh, but allow to cool. Electrolytic at 60— V for 5—30 s. Immerse in Solution A for 2—5 s. Precaution—Do not boil dry—anhydrous picric acid is unstable and highly explosive. Immerse to 1 min. Use by immersion only. For highly corrosion-resistant alloys, use 20—30 mL HCl. Rinse in cold water. Add 2 drops of HCl just before using. Immerse or swab 5—60 s. Immerse in boiling solution for 5 min. Immerse or swab few seconds to few minutes. The numbers of electrolytic etchants e07 italicized to differentiate them from nonelectrolytic etchants.
Immerse with gentle agitation 5—30 s. Pre-etch steel specimens with nital before tinting the MnS add 0. Solution should be freshly prepared. Follow with water rinse, alcohol rinse, dry.
The deposition is conducted inside a vacuum evaporator of the type used to prepare replicas for electron microscopy.
Immerse 1—2 s at a time and immediately rinse with methanol. Electrolytic at 6 V for 30—60 s. Immerse about 15 s.
Use Al, Pb, or stainless steel cathode. Use this solution for alternate etch and polishing.
ASTM E407-07 Standard Practice for Microetching Metals and Alloys
Stop etch when surface is red-violet. Continued Procedure Electrolytic in Solution A: Stable for 3—90 days, depending on HCl concentrations. H2SO4 may be increased to 20 mL for deeper attack. Use a polyethylene beaker to contain aetm etchant if it contains? Higher percentage of HCl minimizes pitting. Film on etched aluminum bronze removed by No. Alloys are listed as a group or series when one or more etchants are common to the group or series. aatm
Pure Ni and high Ni alloys, 47, 25,31c 38,50, 50,89, d407, 50, 83, 98, 13a 38,50, 25,47, 48b, 94,34 50, 83, 40,74e, 25, 74e, 50, 94,12, 87, 89,25, 94, 13a 19b, atsm, 22a general structure grain boundary sul? Make concentration changes on this basis.