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 Practice for Microetching Metals and Alloys
Can increase HNO3 to increase strength. Add 2 drops of HCl just before using. Immerse 10—30 min depending on depth of worked metal layer.
Higher percentage of HCl minimizes pitting. Immerse 1—2 s at a time and immediately rinse with methanol. Swab for 5—20 s. Swab until stain is removed. Total etching time 3 min 50 mL Carbitol diethylene glycol monoethyl with agitation.
Immersion will produce a stain etch. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Electrolytic at 8—10 V 0. Austenite turns brown on overetching. On a microscopic scale, metal is made up of many grains which can vary in e4407 and size. Precaution—Keep cool when mixing and use. Other grades, such as United States http: It may be helpful to place the specimen on a small piece of white paper.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
Clean in HNO3 if necessary. To etch, swab with Solution B for 5 s. Additional information can be obtained at the EPA website3. Electrolytic at 50—60 V for 10—20 s. Immerse with gentle agitation 10—60 s.
Start at 3 V dc. Long immersion ashm will result in copper deposition on surface. Swab for 1—3 min. NOTE 2—Electrolytic etchants are italicized. Electrolytic at 6 V: Rinse in cold water.
Made more active by adding few drops of H2SO4 just before use. Swab 1—3 min in Solution A acts as etch polish. Warm specimen in boiling water prior to immersion for 10 to s. S407 and pitting increase as CrO3 increased.
A light pre-etch, or a slight amount of polishing relief, may lead to sharper delination of the constituents after vapor deposition.
ASTM E is a method of etching a metal sample to reveal its microstructure. Helps to chemically polish.
Electrolytic at 6 V for 3—6 s. Composition given will saturate the solution with NaCl.
ASTM E – 99 Standard Practice for Microetching Metals and Alloys
The specimen is polished on this wheel until the surface turns black. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service e047. For best results use before pellets have dissolved.
Where ethanol or methanol, or both are listed as alternates, ethanol is the preferred solvent.