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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Standard Practice for Microetching Metals and Alloys
Swab for 5—60 s. Immerse few seconds to a few minutes. Electrolytic at 50—60 V for 10—20 s.
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 d407 stage. ASTM E is a method of etching a metal sample to reveal its microstructure. Use crossed polarized light and sensitive tint to improve coloration. Decomposes with possible explosion on standing.
Up to 30 mL of HCl may be used for more vigorous action. Stable for 3—90 days, depending on HCl concentrations.
Swab for 30 s or longer. Immerse or swab to 1 min. Etch time varies with material. Additional information can be obtained at the EPA website3. Swab 3—5 s for F and T6, 1—2 min for T4 and O temper. Animal studies have shown chromium VI to cause lung tumors via inhalation exposure. Increase HF to exaggerate grain aztm. H2SO4 may be increased to 20 mL for deeper attack.
Rinse in cold water. The deposition is conducted inside a vacuum evaporator of the type used to prepare replicas for electron microscopy. Swab gently 10—15 s. Much stronger reaction than No. Use fresh, but allow to cool. Swab few seconds to a minute. One or several small lumps of a suitable dielectric compound with the desired e4407 of refraction is heated under a vacuum until it evaporates.
Current edition approved May 1, Works best with attack-polished specimens. A light pre-etch, or a slight amount of polishing relief, may lead to sharper delination of the constituents after vapor deposition. Made more active by adding few drops of H2SO4 just before use. National Academy Press, Then electrolytic in Solution B: Immerse 30 s—3 min. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Colors matrix of Cu alloys. Mix in order given.
Electrolytic at 10—20 V for 10—15 s. Excellent grain boundary etch for ferritic stainless steels. A hot water rinse just prior to etching may be used to activate the reaction.
If surface activation is necessary,? Immerse about 15 s. At 30 V, etch for 1 min. Properly discard when dark yellow. Properly discard Solution B after 1 hr. This includes being familiar with the federal, state, and local regulations governing the handling, storage, and disposal of these chemical etchants.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
To etch, swab with Solution B for 5 s. Stains sigma and chi yellow to red brown, ferrite gray to blue gray, carbides barely touched, austenite not touched. Peroxide content varies directly with copper content of alloy to be etched. Add HCl e4007 before use. Add H2O2 dropwise to maintain action.
Use stainless steel cathode. Users should be aware of the type of hazards involved in the use of all chemicals used, including those hazards that are immediate, long-term, visible, invisible, Copyright? May be used electrolytically.
Remove the specimen from the etchant when the surface is colored violet, rinse and dry.