ASTM E Standard Practice for Microetching Metals and Alloys – Download as PDF File .pdf), Text File .txt) or read online. Buy ASTM E PRACTICE FOR MICROETCHING METALS AND ALLOYS from SAI Global. Designation: E − 07´1. Standard Practice for. Microetching Metals and Alloys1 This standard is issued under the fixed designation E; the number.
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NOTE 2—Electrolytic etchants are italicized. Please help us to share our service with your friends. The etchant composition and procedure is then located in Table 2corresponding to the etchant number.
A light pre-etch with a general-purpose chemical etchant may lead to sharper delineation of the structure after tint etching.
Precision and Bias 8. Originally approved in Remove the specimen from the etchant when the surface is colored violet, rinse and dry. Care must be taken to keep it moist because dry picric acid is shock sensitive and highly explosive especially when it is combined with metals such as copper, lead, zinc, and iron. 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 4e07 chemicals.
Therefore, a glove must be carefully selected and used to ensure that it will provide the needed protection for the specific etchant being used. Some of these etchants will not work at all if water is not present. Slowly evaporate the lumps and observe the surface of the specimen. After polishing, the surface must be carefully cleaned. It is recommended that any bottle of picric acid 70 appears dry or is of unknown vintage not be opened and that proper emergency personnel be notified.
A light pre-etch, or a slight amount of polishing relief, may lead to sharper delination of the constituents after vapor deposition. Stop the evaporation when the color is purple to violet, although in some cases, thinner films with green or red colors have produced good results.
Users should be aware of the type of hazards involved 007 the use of all chemicals used, including those hazards that are immediate, long-term, visible, invisible, and with or without odors. Solutions are listed to highlight phases present in most major alloy systems.
A number in parentheses indicates the year of last reapproval. A number of etchants generate fumes or vapors and should only be stored in properly vented containers.
For each metal and alloy, one or more etchant numbers and their corresponding use is indicated. Please fill this form, we will try to respond as soon as possible.
ASTM E407-07 Standard Practice for Microetching Metals and Alloys
As the film thickness increases, the surface and the paper will become colored with the color sequence changing in the order yellow, green, red, purple, violet, blue, silvery blue. Gently agitate the solution while observing the polished surface. We need your help! This standard has been approved for use by agencies of the Department of Defense.
Experience has shown that the quality of tap water varies significantly and can adversely affect some etchants.
Pure Co Hard-facing and tool metals High-temperature alloys 14, 15, 16, 17 18, 19, 20 20, 18, 16, 21, 22b, 24, 25 19 general structure general structure general structure phase identification 26, 27, 28, 29, 30, 31d, 32, 33, 34b, 35, 36, 37, 38, 39, 40, 41, 42, 8b,43, 28 general structure Columbium Base see niobium base Copper Base: Thank you for interesting in our services.
Specific alloys are listed only when necessary. This problem is very common when the specimen or mounting media contain porosity and when the mounting material such as Bakelite does not bond tightly to the specimen resulting in astk along the edges of the specimen.
Additionally, one can contact the glove manufacturer or, if available, consult the manufacturers glove chart. Size px x x x x In all cases, extreme care should be taken to remove all traces of the etchant by adtm washing and complete drying of the specimen before placing it on the microscope stage. The specimen is placed in the solution using tongs, polished face up.
If that does not provide enough detailed information, contact the chemical manufacturer directly. In some instances it may be necessary to wear more f407 one pair of gloves to provide proper protection.
It may be helpful to place the specimen on a small piece of white paper. Methanol should be used in a properly designed chemical fume hood. A vacuum level of 1. Last previous edition approved in as E—99 DOI: See Guide E on Metallographic Laboratory Safety for additional information on safety precautions for electrolytes containing perchloric acid.
A selection of useful books on this subject is given in Refs. This includes being familiar with the federal, state, and local regulations governing the handling, storage, and disposal of these chemical etchants. Observe printed cautions on reagent bottles.
Metal Etchants Uses Pure Al 1a, 2, 3 4, 5 1b general structure grain structure under polarized light grain boundaries and slip lines series 1a, 3, 2 4, 5 6, 7 general structure grain structure under polarized light phase identifications series 3, 2, 1a 8a, 6, 7 general structure phase identifications series 3, 1a 4, 5 8a, 6, 7 general structure grain structure under polarized light 0 identifications series 3, 1a general structure series 3, 1a, 2, 6, 8a 4, 5 general structure grain structure under polarized light series 3, 1a, 2, 6, 8a, 4, 5 1a, 2, 7, 6, 8a general structure grain structure under polarized light phase identifications series 3, 1a, 2 4, 5 3b, 6 general structure grain structure under polarized light phase identifications 9, 10 11 general structure via polarized light general structure Aluminum Base: Animal studies have shown chromium VI to cause lung tumors via inhalation exposure.
Alloys are listed as a group or series when qstm or more etchants are common to asttm group or series. Buying HF at the lowest ee407 concentration will significantly reduce risk. After coloration begins, allow the solution to settle and aastm motionless.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
Significance and Use 5. This is imperative with etchants that give off noxious odors or toxic vapors that may accumulate or become explosive. An extremely high quality polish is required as tint etchants will reveal remaining polishing damage even if it is not visible with bright field illumination.
Distilled water may be added to maintain hydration, It must only be stored in plastic or glass bottles with nonmetallic lids. Please copy and paste this embed script to where w407 want to embed Embed Script.
For specific cautionary statements, see 6. Current edition approved May 1,