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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ASTM E – 07()e1 Standard Practice for Microetching Metals and Alloys
Alternately immerse and polish several minutes. A number in parentheses indicates the year of last reapproval. Mix in order given. Stains carbides and sigma. Swab for 1—3 min. Will not attack sul? Properly discard when dark orange color. Precaution—Properly discard before solution attains a dark orange e47.
Swab 3—10 s or immerse to 2 min.
Standard Practice for Microetching Metals and Alloys
Distilled water may be added to maintain hydration, It must only be stored in plastic or glass bottles with nonmetallic lids. Use fresh, but allow to cool.
A mixture of 5 drops of each will cover the surface of a 1 in. Slowly evaporate the lumps and observe the surface of the specimen. It is not intended as a? Immerse or swab 5—30 s. After coloration begins, allow the solution to settle and remain motionless. All persons using any etchants should be thoroughly astk 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 asfm.
Immerse or swab few seconds at a time until desired results are obtained. For best results use before pellets have dissolved.
Distilled water is then slowly added to the wheel and polishing continued until the surface is bright. Immerse to 2 min to darken matrix to reveal carbides and phosphides.
Precaution—Do not boil dry—anhydrous picric acid is unstable and highly explosive. 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.
Users should be aware asstm the type of hazards involved in the use of all chemicals used, including those hazards that are immediate, long-term, visible, invisible, Copyright?
Clean in HNO3 if necessary. Electrolytic at 6 V for few seconds. Solution should be freshly prepared.
ASTM E – 99 Standard Practice for Microetching Metals and Alloys
Tends to pit with longer times. Anodize 1—3 min, 20—45 V d-c. Stains carbides dark, ferrite yellow, sigma blue. Good microstructural results require significant preparation to obtain a mirror finish asttm no scratches or edge rounding prior to etching. Can be heated to increase activity. Electrolytic at 15—50 V for 15—60 s. Follow with water rinse, alcohol rinse, dry.
Properly discard after use. Follow with electrolytic etch at low current density in same solution. Electrolytic at 30—65 V for 10—60 s.
Immerse in Solution A for 2—5 s.