Astm e407-07

Immerse polished face up for few seconds. Precaution—Also poisonous by ingestion as well as skin contact. Precision and Bias 8. Colors matrix of Cu alloys. Etch time varies with material.

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Space electrodes 2 cm apart. National Academy Press, Immerse 15—25 min when specimens or parts cannot be given usual metallographic polish. Properly wstm Solution B after 1 hr.

ASTM E407-07 Standard Practice for Microetching Metals and Alloys

Some of these etchants will not work at all if water is not present. One or several small lumps of a suitable dielectric compound with the desired index of refraction is heated under a vacuum until it evaporates. Swab for 30 s or longer. Continued Procedure Electrolytic in Solution A: Slowly evaporate the lumps and observe the surface of the specimen. Electrolytic at 6 V for 10—20 s.

ASTM E - 07()e1 Standard Practice for Microetching Metals and Alloys

If d is not colored, increase NaOH to 40 g. Properly discard e40-07 dark orange color. Pure Th Th alloys Tin Base: Will chemically polish with longer times.

Electrolytic at 30 V for 30 s. Use small portion of stock solution for 4 h max. Add the HCl just before using. Pure Al Etchants Uses 1a, 2, 3 4, 5 1b 1a, 3, 2 4, 5 6, 7 3, 2, 1a 8a, 6, 7 3, 1a 4, 5 8a, 6, 7 3, 1a 3, 1a, 2, 6, 8a 4, 5 3, 1a, 2, 6, 8a, 4, 5 1a, 2, 7, 6, 8a 3, 1a, 2 4, 5 3b, 6 general structure grain structure under polarized light grain boundaries and slip lines general structure grain structure under polarized light phase identi?

Immerse or swab 5—60 s. Swab 1—3 s for F and T6, 10 s for T4 and O temper.

Storage of fuming etchants in sealed or non-vented containers may create an explosion hazard. Electrolytic at 6 V for few seconds.

Use stainless steel cathode. Immerse polished face up for few seconds.

ASTM E - 07 Standard Practice for Microetching Metals and Alloys

A number in parentheses indicates the year of last reapproval. Colors matrix of Cu alloys. Swab few seconds to a minute. Etching ast, is increased, sensitivity decreased with increased percentage of HNO3.

Safety precautions and miscellaneous information are also included. Gently agitate the solution while observing the polished surface.

Immerse with gentle agitation 10—60 s. Immerse face up, gently agitate until coloration begins, allow to settle.

A number of etchants generate fumes or vapors and should only be stored in properly vented containers. Mix in order given. Polishes at high currents. Immersion will produce a stain etch. Start at 3 V dc.

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