ASTM Epdf – Download as PDF File .pdf), Text File .txt) or read online. ASTM E Standard Practice for Microetching Metals and Alloys. Basic Description: ASTM E is a method of etching a metal sample to reveal its microstructure. On a microscopic scale, metal is made up of many grains which.
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Standard – Standard Practice for Microetching Metals and Alloys ASTM E –
Immerse about 15 s. A hot water rinse just prior to etching may be used to activate the reaction. Use fresh or age up e047 1 min. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Additionally, it is recommended that a calcium gluconate 2 cream or other appropriate HF neutralizing agent be available for use if direct skin contact of the etchant occurs.
Add HCl just before use. It is recommended that any bottle of picric acid that appears dry or is of unknown vintage not e47 opened and that proper emergency personnel be noti?
For more corrosion resistant astj. Continued Uses general structure grain boundaries general structure etch-polishing for viewing grains with polarized axtm Etchants66,,a a Osmium Base: At 30 V, etch for 1 min. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
NOTE 2—Electrolytic etchants are italicized.
Standard Practice for Microetching Metals and Alloys
Rinse with ethanol or methanol and blow dry. Continued Procedure Electrolytic in Solution A: Swab 3—10 s or immerse to d407 min. Reveals Ti- and Cb-rich astmm at a faster rate than grain boundaries.
Immerse few seconds to a few minutes. Electrolytic at 10 V asfm. Immerse 15—25 min when specimens or parts cannot be given usual metallographic polish. Rinse in cold water. Pure Co Hard-facing and tool metals High-temperature alloys 9, 10 11 12, 13c general structure via polarized light general structure general structure 14, 15, 16, 17 18, 19, 20 20, 18, 16, 21, 22b, 24, 25 19 general structure general structure general structure phase identi?
Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingpaint testingplating testingadhesive testingcircuit board testingand other testing. Immerse to 2 min to darken matrix to reveal carbides and phosphides. Remove the specimen from the etchant when the surface is colored violet, rinse and dry.
Multiple etching may be required. Swab for 5—60 s.
Alloys are listed e470 a group or series when one or more etchants are common to the group or series. As cast Nickel Base: Electrolytic at 10—20 V for 10—15 s. KMnO4 is an agressive staining agent. The specimen is polished on this wheel until the surface turns black.
ASTM E – METAL MICROSTRUCTURE TESTING SERVICES
An experienced metallurgist is required to interpret the images created. Vary HF to increase or decrease activity. Precaution—Keep cool when mixing and use. When more than one etchant number is given for a particular use, they are usually given in order of preference. Stains carbides and sigma.
Information describing the appropriate glove may be obtained by consulting the MSDS for the chemical being used. Immerse with gentle agitation 10—60 s.
After coloration begins, allow the solution to settle and remain motionless. Electrolytic at 6 V for 10—20 s. Alloying elements in the metal sometimes separate into microscopic particles with distinct shapes. Methanol should be used in a properly designed chemical fume hood. Total etching time 3 min 50 mL Carbitol diethylene glycol monoethyl with agitation.
Alternately immerse and polish several minutes. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Stains carbides dark, ferrite yellow, sigma blue. This standard has been approved for use by agencies of the Department of Defense. Pure Cu 26, 27, 28, 29, 30, 31d, 32, 33, 34b, 35, 36, 37, 38, 39, 40, 41, 42, 8b,43, 28 44, 31d, 34b, 35, 36, 37, 38, 39, e47, 45, 46, 41, 45 41 41 34, 47, 48, 40, 49, 50 41 51, 52 8b general structure chemical polish and etch general structure general general general general sstm general structure structure structure structure structure structure Cu-Al aluminum bronze Cu-Be Cu-Cr Cu-Mn Cu-Ni Cu-Si Cu-Sn tin bronze Admiralty metal Gilding metal Cartridge brass Free-cutting brass Nickel silver Cu alloys general structure 31d, 32, 33, 41, 42, 49 26, 27, 28, 29, 30, 44, 41, 31d, 32, 33, 34b, 35, 36, 37, 38, 39,53, 43, 28, 49 42, 49, 54 55, 56 general asym general structure chemical polish and etch darkens beta ast alpha-beta brass etching of cold worked brass general structure Dysprosium Base: Precision and Bias 8.
Immerse or swab 5—30 s. Electrolytic at 30 Wstm for 30 s. To etch, swab with Solution B for 5 s.