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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Add HCl just before use. Helps to chemically polish. Swab for 1—3 min. Will chemically polish with longer times.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
Other grades, such as United States http: Additional information can be obtained at the EPA website3. Rinse with methanol and blow dry. Immerse 1—2 s at a time and immediately rinse with methanol.
Immerse with gentle agitation 5—30 s. Will not attack sul? Precaution—Do not boil dry—anhydrous picric acid is unstable and highly explosive. As cast Nickel Base: Advanced Plastic and Material Testing, Inc. Individual reprints single or multiple copies of this standard may be obtained asm contacting ASTM at the above address or at phonefaxor service astm.
Reveals Ti- and Cb-rich areas at a faster rate than grain boundaries. Decomposes with possible explosion on standing. High magnification optical microscopy and sometimes scanning electron satm SEM is required to reveal important details. Immerse or swab few seconds to few minutes. Immerse in Solution A with gentle agitation for several seconds.
Clean in HNO3 if necessary. Stains asrm and sigma. Small additions of HNO3 activate solution and minimize pitting. Phases can be colored by Nos.
Repeat as often as necessary. Properly discard when dark orange color.
At 30 V, etch for 1 min. Can increase HNO3 to increase strength. Repeat three times and repolish lightly. Observe printed cautions on reagent bottles. Stop when surface is dark. Activity may be decreased by substituting glycerol for water. Immerse or swab few seconds at a time until desired results are obtained. A number of etchants generate fumes or vapors and should only be stored in properly vented containers.
Use carbon cathode and platinum wire connection to specimen. Electrolytic 5—10 V for 5—60 s. If the chemical is not listed or if chemical mixtures are being used, contact the glove manufacturer for a recommendation. Cast aluminum often has a dendritic fern like structure formed by the distribution of silicon.
Etch 2—3 s; 3 s pre-etch in No.
It may be helpful to place the specimen on a f407 piece of white paper. In some instances it may be necessary to wear more than one pair of gloves to provide proper protection. On a microscopic scale, metal is made up of many grains which can vary in shape and size. Immerse 4—30 min depending on depth of worked metal layer.
Standard Practice for Microetching Metals and Alloys
Contact us for a quote. Use a polyethylene beaker to contain the etchant if it contains? Electrolytic at 60— V for 5—30 s. Electrolytic at 30 V for 30 s. Precaution—Properly r407 before solution attains a dark orange color. After 30 s maintain at 11? Etch time varies with material. Increase HF to exaggerate grain boundaries. Immerse specimen face up.