ASTM E2792-2013 Standard Test Method for Determination of Hydrogen in Aluminum and Aluminum Alloys by Inert Gas Fusion《用惰性气体融合法测定铝和铝合金中氢含量的标准试验方法》.pdf
《ASTM E2792-2013 Standard Test Method for Determination of Hydrogen in Aluminum and Aluminum Alloys by Inert Gas Fusion《用惰性气体融合法测定铝和铝合金中氢含量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E2792-2013 Standard Test Method for Determination of Hydrogen in Aluminum and Aluminum Alloys by Inert Gas Fusion《用惰性气体融合法测定铝和铝合金中氢含量的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E2792 13Standard Test Method forDetermination of Hydrogen in Aluminum and AluminumAlloys by Inert Gas Fusion1This standard is issued under the fixed designation E2792; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method applies to the determination of hydro-gen in aluminum and aluminum alloys in concentrations
3、 from0.05 mg/kg to 1 mg/kg.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations p
4、rior to use.2. Referenced Documents2.1 ASTM Standards:2E50 Practices for Apparatus, Reagents, and Safety Consid-erations for Chemical Analysis of Metals, Ores, andRelated MaterialsE135 Terminology Relating to Analytical Chemistry forMetals, Ores, and Related MaterialsE177 Practice for Use of the Ter
5、ms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1914 Practice for Use of Terms Relating to the Develop-ment and Evaluation of Methods for Chemical Analysis3. Terminology3.1 DefinitionsFor definitions of terms u
6、sed in this testmethod, see Terminology E135 and E1914.4. Summary of Test Method4.1 The specimen, contained in a high-purity graphitecrucible, is heated to just below the melting point to drive offthe surface hydrogen. The sample is then heated to just beyondthe melting point under a flowing carrier
7、 gas atmosphere.Hydrogen present in the sample is released as molecularhydrogen into the flowing gas stream. The released hydrogen isseparated from other liberated gases such as carbon monoxideand subsequently measured in a thermal conductivity cell.4.2 Calibration is made using gas dosing with eith
8、er heliumor hydrogen or reference materials of known hydrogen content.4.3 This test method is written for use with commercialanalyzers equipped to carry out the above operations automati-cally.5. Significance and Use5.1 This test method is intended for the routine testing ofaluminum and aluminum all
9、oys to qualitatively determine theconcentration of hydrogen in aluminum and aluminum alloys.It is not intended to verify compliance with compositionalspecifications because of the lack of certified reference mate-rials. It is assumed that all who use this test method will betrained analysts capable
10、of performing common laboratoryprocedures skillfully and safely. It is expected that the workwill be performed in a properly equipped laboratory.6. Interferences6.1 The elements ordinarily present in aluminum and alu-minum alloys do not interfere.7. Apparatus7.1 Fusion and Measurement ApparatusAutom
11、atic hydro-gen analyzer, consisting of an electrode furnace or inductionfurnace; analytical gas stream; impurity removal systems;auxiliary purification systems and either a thermal conductivitycell hydrogen measurement system or an infrared hydrogenmeasurement system. Several models of commercial an
12、alyzersare available and presently in use in industry. Each has its ownunique design characteristics and operational requirements.Consult the instrument manufacturers instructions for opera-tional details.7.2 Graphite Crucibles, machined from high-purity graph-ite. Use the crucible design(s) recomme
13、nded by the manufac-turer of the instrument.1This test method is under the jurisdiction of ASTM Committee E01 onAnalytical Chemistry for Metals, Ores, and Related Materials and is the directresponsibility of Subcommittee E01.04 on Aluminum and Magnesium.Current edition approved April 1, 2013. Publis
14、hed June 2013. Originallyapproved in 2011. Last previous edition approved in 2011 as E2792-11. DOI:10.1520/E2791-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to
15、the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.3 Quartz Crucibles, for analysis of steel reference mate-rials on some instrument types. Use the crucible design(s)recommended by
16、 the manufacturer of the instrument.7.4 Crucible Tongs, capable of handling recommended cru-cibles.8. Reagents and Materials8.1 AcetoneReagent Grade or ACS certified grade orhigher purity.8.2 Ethyl AlcoholReagent Grade orACS certified grade orhigher purity.8.3 Isopropyl AlcoholReagent Grade or ACS c
17、ertifiedgrade or higher purity.8.4 Sodium Hydroxide on Clay (Commonly known as As-carite II).8.5 High-Purity Gas (99.99 %)Argon, nitrogen, and he-lium or hydrogen (Note 1).NOTE 1Carrier and dosing gases vary by instrument model andinclude high-purity argon, nitrogen, helium or hydrogen. Gas purityre
18、quirements shall be specified by the instrument manufacturer.8.6 Magnesium Perchlorate (commonly known as Anhy-drone).8.7 Molecular Sieve, as specified by the instrument manu-facturer.8.8 Schutze ReagentIodine pentoxide on granular silica,purity as specified by the instrument manufacturer.8.9 Copper
19、 Wire, to convert CO to CO2in thermal conduc-tivity cell instruments. Characteristics should be specified bythe instrument manufacturer.8.10 Glass wool, used to pack reagents.8.11 OMIPurifier TubeOrganolithium polymer used bysome instruments to remove O2, water vapor, CO, CO2, mostsulfur compounds,
20、most halogen compounds, alcohols, andphenols to less than 10 ppb from the carrier gas.9. Hazards9.1 Refer to Practices E50 for potential hazards presentwhen using this test method.9.2 Use care when handling hot crucibles and operatingelectrical equipment to avoid personal injury by either burn orele
21、ctrical shock.10. Preparation of Apparatus10.1 Assemble the apparatus as recommended by the manu-facturer.10.2 Provide the manufacturers recommended electricalpower and gas requirements. Prepare the apparatus for opera-tion in accordance with the instrument manufacturers recom-mendations.10.3 Set th
22、e instrument to the operational mode in accor-dance with the instrument manufacturers recommendations.10.4 Test the furnace and analyzer to ensure that the gasstream meets manufacturers requirements for acceptable leakrate.10.5 Optimize the crucible pretreatment power settings(commonly called outgas
23、), the surface and analysis powersettings, crucible pretreatment time and analysis integrationtime for aluminum alloys.10.5.1 Most manufacturers offer application guidance onappropriate settings to achieve optimum performance foraluminum alloys. Refer to this application guidance literaturefor assis
24、tance in determining optimum settings.10.5.2 If the instrument is capable; optimize the cruciblepretreatment time and power settings to achieve a stable blank(see 12.2.2).10.5.3 If the instrument is capable; optimize the analysistime and power settings to obtain the optimum signal to noiseratio for
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