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 – 99 Standard Practice for Microetching Metals and Alloys
Information describing the appropriate glove may be obtained by consulting the MSDS for the chemical being used. Swab 1—3 min in Solution A acts as etch polish. Additionally, it is recommended that a calcium gluconate 2 cream or other appropriate HF neutralizing agent be available for use if direct skin contact of the etchant occurs. For etch-polishing, use shorter times. Swab gently 5—15 s.
Electrolytic at 3 V for 2—10 s. The specimen is examined as polished under polarized light. Etch 2—3 s; 3 s pre-etch in No. Then electrolytic in Solution B: Add 2 drops of HCl just before using. Mix equal volumes of Solutions A and B just before use. Multiple etching may be required. Swab for 1—3 min. Film on etched aluminum bronze sstm by No. Made more active by adding few drops of H2SO4 just before use. Follow with light repolish. If the chemical is e4007 listed or if chemical mixtures are being used, contact the glove manufacturer for a recommendation.
Preheating specimen in boiling water hastens reaction. Reveals Ti- and Cb-rich areas at a faster rate than grain boundaries. Will chemically polish with longer times.
Standard Practice for Microetching Metals and Alloys
NOTE 2—Electrolytic etchants are italicized. On a microscopic scale, metal is made up of many grains which can vary in shape and size.
John Wiley and Sons. Rinse in cold water. A number in parentheses indicates the year of last reapproval. Use this solution for alternate etch and polishing. Better results are sometimes obtained by? Solution good for several days, or longer. Immerse with gentle agitation 5—15 s. Pure Ni and high Ni alloys, 47, 25,31c 38,50, 50,89,50, 83, 98, 13a 38,50, 25,47, 48b, 94,34 50, 83, 40,74e, 25, 74e, 50, 94,12, 87, 89,25, 94, 13a 19b,22a general structure grain boundary sul?
Use fresh, but allow to cool. Swab 3—5 s for F and T6, 1—2 min for T4 and O temper. In all cases, extreme care should be taken to remove all traces of the etchant by thorough washing and complete drying of the specimen before placing it on the microscope stage. Etch time varies with material. ASTM E is a method of etching a metal sample to reveal its microstructure.
Do not store Properly discard after use. Anodize 1—3 min, 20—45 V d-c. Use small portion of stock solution for 4 h max. H2SO4 may be increased to 20 mL for deeper attack. Much astmm reaction than No. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Solution decomposes on standing. If specimen has considerable surface?
HF attacks and HNO3 brightens the surface of titanium. At this time the specimen should be ready for examination via polarized light. Immerse with gentle agitation 10—60 s.
It is not intended as a? Can be heated to increase activity.
Immerse few seconds to a few minutes. Immerse or swab 5—30 s.