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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Pure Th Th alloys Tin Base: Repeat as often as necessary. Vary HF to increase or decrease activity. National Academy Press, All persons using any etchants should be thoroughly familiar with all of the chemicals involved and the proper procedure for handling, mixing, and disposing of each chemical, as well as any combinations of those chemicals. Electrolytic at 50—60 V for 10—20 s. Electrolytic at 60— V for 5—30 s.
Information describing the appropriate glove may be obtained by consulting the MSDS for the chemical being used. John Wiley and Sons. Anodize 1—3 min, 20—45 V d-c. Immerse 1—2 s at a time and immediately rinse with methanol. Properly discard when dark orange color.
Space electrodes 2 cm apart. Therefore, a glove must be carefully selected and used to ensure that it will provide the needed protection for the speci?
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? Polishes at high currents. Other grades, such as United States http: Immerse with gentle agitation 15—30 s.
Animal studies have shown chromium VI to cause lung tumors via inhalation exposure. On a microscopic scale, metal is made up of many grains which can vary in shape and size. Electrolytic at 20—60 V for 1—5 min.
Decomposes with possible explosion on standing. Slowly evaporate the lumps and observe the surface of the specimen.
Standard – Standard Practice for Microetching Metals and Alloys ASTM E –
Immerse until surface is colored. This standard ast been approved for use by agencies of the Department of Defense. Swab gently 10—15 s. Colors matrix of Cu alloys. Rinse with methanol and blow dry.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at astj above address or at phonefaxor service astm. Properly discard when solution turns dark yellow.
Start at 3 V dc. The numbers of electrolytic etchants are italicized to differentiate them from nonelectrolytic etchants.
Standard Practice for Microetching Metals and Alloys
Stains carbides and sigma. Buying HF at the lowest useable concentration will signi? Brown discoloration will form at edges of specimen. Microstructural results are typically reported as pictures of the microstructure along with a paragraph interpreting the meaning of the structure.
If surface is insufficiently etched use Solution B electrolytically at 1? If the chemical is not listed or if chemical mixtures are being used, contact the glove manufacturer for a recommendation. Electrolytic at 6 V for 5—10 s. For etch-polishing, use shorter time. Water rinse, alcohol rinse, dry, then etch with No. Asttm number in parentheses indicates the year of last reapproval. The specimen is polished on this wheel until the surface turns black.
Mix equal volumes of Solutions A and B just before use. Immerse in boiling solution for 5 min.