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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If dried particles are noted on aztm near the lid, submerge the bottle in water to re-hydrate them before opening. Summary of Practice 4. Alloys are listed as a group or series when one or more etchants are common to the group or series. After polishing, the surface must be carefully cleaned. A number of etchants generate fumes or vapors and should only be stored in properly vented containers.
Care must be taken to keep it moist because dry picric acid is shock sensitive and highly explosive e047 when it is combined with metals such as copper, lead, zinc, and iron.
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. A number in parentheses indicates the year of last reapproval. Please copy and paste this embed script to where you want to embed Embed Script.
Originally approved in 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, asym, 43, 28 general structure Columbium Base see niobium base Copper Asfm NOTE 2—Electrolytic etchants are italicized.
A light pre-etch with a general-purpose chemical etchant may lead to sharper delineation of the structure after tint etching. Other grades, such as United States Pharmacopeia USPmay be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without detrimental effect. A 007 level of 1. Some of these etchants will not work at all if water is not present.
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. Methanol should be used in a properly designed chemical fume hood. One or several small lumps of a suitable dielectric compound with the desired index of refraction is heated under a vacuum until it evaporates. This includes being familiar with the federal, state, and local regulations governing the handling, storage, and disposal of these chemical etchants.
When more than asmt etchant number is given for a particular use, they are usually given in order of preference. Thank you for interesting in our services. If that does not provide enough detailed information, contact the asstm manufacturer directly. 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.
The numbers of electrolytic etchants are italicized to differentiate them from nonelectrolytic etchants. Current edition approved May 1, For specific cautionary statements, see 6.
Specific alloys are listed only when necessary. Last previous edition approved in as E—99 DOI: Size px x x x x In particular, note that solutions containing perchloric acid must be used in an exclusive hood equipped with a wash down feature to avoid accumulation of explosive perchlorates. 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 seepage along the edges of the specimen.
Animal studies have shown chromium VI to cause lung tumors via inhalation exposure. For each metal and alloy, one or more etchant numbers and their corresponding use is indicated.
Unless otherwise indicated, it is intended that all reagents 3 http: Solutions are listed to highlight phases present in most major alloy systems. We need your help to maintenance this website.
It is recommended that any bottle of picric acid that appears dry or is of unknown vintage not be opened and that proper emergency personnel be notified. We are a non-profit group that run this website to share documents. Use a polyethylene beaker to contain the etchant if it contains fluorine ions for example, etchants containing ammonium bifluoride, NH4 FHF.
The deposition is conducted inside a vacuum evaporator of the type used to prepare replicas for electron microscopy. If the chemical is not listed or if chemical mixtures are being used, contact the glove manufacturer for a recommendation.