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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Made more active by adding few drops of H2SO4 just before use. Higher percentage of HCl minimizes pitting. Reveals Ti- and Cb-rich areas at a faster rate than grain boundaries. In some instances it may be necessary to wear more than one pair of gloves to provide proper protection.
The specimen is polished on this wheel until the surface turns black. Contact us for a quote. Electrolytic at 8—10 V 0. If surface activation is necessary,?
John Wiley and Sons. Etching rate is increased, sensitivity decreased with increased percentage of HNO3. Add H2O2 dropwise to maintain action.
Therefore, a glove must be carefully selected and used to ensure that it will provide the needed protection for the speci? Immerse in boiling solution for 5 min.
Standard Practice for Microetching Metals and Alloys
Current edition approved May 1, Up to 30 mL of HCl may be ashm for more vigorous action. Etch time varies with material. Stains carbides and sigma. 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.
Space electrodes 2 cm apart.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
Alloying elements in the metal sometimes separate into microscopic particles with distinct shapes. Precaution—Properly discard before solution attains a e40 orange color. Immerse or swab 5 to 30 s. For etch-polishing, use shorter times.
Electrolytic at 6 V: Use optional ingredients to improve coloration, if needed. Use a polyethylene beaker to contain the etchant if it contains?
Immerse or swab 5—30 s. Unless otherwise indicated, it is intended that all reagents conform sstm speci? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
ASTM E – METAL MICROSTRUCTURE TESTING SERVICES
To mix, add the HCl to CrO3. For best results use before pellets have dissolved. Follow with water rinse, alcohol rinse, and dry. In particular, note that solutions containing perchloric acid must be used in an exclusive hood equipped with a wash down feature to avoid accumulation of explosive perchlorates. Lightly apply etchant over surface until dark stain develops. Electrolytic at 30 V for 30 s. The specimen is placed in the solution using tongs, polished face up.
Immerse or swab to 1 min. Immerse specimen face up.
Vary HF to increase or decrease activity. Electrolytic at 6 V for 3—6 s.
Electrolytic at 6 V for 5—20 s. Immerse specimen face up, gently agitate solution until coloration begins, allow to settle. A vacuum level of 1. Properly discard after use.