ASTM_E_106_-_83_1996.pdf

Designation:E 106 83(Reapproved 1996)Standard Test Methods forChemical Analysis of Copper-Beryllium Alloys1This standard is issued under the fixed designation E 106;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover procedures for the chemicalanalysis of copper-beryllium alloys having chemical composi-tions within the following limits:ElementConcentrationRange,%Copper97 to 98Beryllium0.4 to 2.05Nickel0.0 to 0.30Cobalt0.0 to 0.3Iron0.0 to 0.301.2 The analytical procedures appear in the following order:SectionsCopper by the Electrolytic Method8-12Beryllium:Phosphate Gravimetric Method13-19Aluminon(Photometric)Method20-27Nickel by the Dimethylglyoxime(Photometric)Method28-36Cobalt by the Nitroso-R-Salt(Photometric)Method37-44Iron by the Thiocyanate(Photometric)Method45-522.Referenced Documents2.1 ASTM Standards:E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance With Specification2E 50 Practices for Apparatus,Reagents,and Safety Precau-tions for Chemical Analysis of Metals3E 55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical Composition3E 60 Practice for Photometric and SpectrophotometricMethods for Chemical Analysis of Metals3E 76 Test Methods for ChemicalAnalysis of Nickel-CopperAlloys3E 173 Practice for Conducting Interlaboratory Studies ofMethods for Chemical Analysis of Metals33.Significance and Use3.1 These test methods for the chemical analysis of metalsand alloys are primarily intended to test such materials forcompliance with compositional specifications.It is assumedthat all who use these test methods will be trained analystscapable of performing common laboratory procedures skill-fully and safely.It is expected that work will be performed ina properly equipped laboratory.4.Apparatus,Reagents,and Photometric Practice4.1 Apparatus and reagents required for each determinationare listed in separate sections preceding the procedure.Theapparatus,standard solutions,and certain other reagents usedin more than one procedure are referred to by number and shallconform to the requirements prescribed in Practices E 50,except that photometers shall conform to the requirementsprescribed in Practice E 60.4.2 Photometric practice prescribed in these methods shallconform to Practice E 60.5.Safety Precautions5.1 For precautions to be observed in these methods,refer-ence shall be made to Practices E 50.Both beryllium metal andits compounds may be toxic.Care should be exercised toprevent contact of beryllium-containing materials with theskin.The inhalation of any beryllium-containing substance,either as a volatile compound or as finely divided powder,should be especially avoided.Beryllium-containing residues(especially ignited oxide)should be carefully disposed of.6.Sampling6.1 Sampling shall conform to Practice E 55.7.Rounding Off Calculated Values7.1 Calculated values shall be rounded off to the desirednumber of places in accordance with the rounding-off methodgiven in 3.4 and 3.5 of Practice E 29.1These test methods are under the jurisdiction of ASTM Committee E-1 onAnalytical Chemistry for Metals,Ores,and Related Materials and are the directresponsibility of Subcommittee E01.05 on Cu,Pb,Zn,Cd,Sn,Be,their Alloys andRelated Metals.Current edition approved Feb.25,1983.Published April 1983.Originallypublished as E 106 54.Last previous edition E 106 72(1978).2Annual Book of ASTM Standards,Vol 14.02.3Annual Book of ASTM Standards,Vol 03.05.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.COPPER BY THE ELECTROLYTIC TEST METHOD8.Apparatus8.1 Electrodes for ElectroanalysisApparatus No.9.9.Reagents9.1 Sulfuric-Nitric Acid MixtureAdd slowly,while stir-ring,300 mL of H2SO4to 750 mL of water.Cool and add 210mL of HNO3.10.Procedure10.1 Transfer 5.00 g of sample to a 300-mL electrolysisbeaker.Add 42 mL of the H2SO4-HNO3mixture,cover,andallow to stand a few minutes until reaction has nearly ceased.Heat at 80 to 90C until dissolution is complete and brownfumes have been expelled.Wash down the cover glass and thesides of the beaker and dilute to about 175 mL(enough tosubmerge the cathode when it is inserted).10.2 Insert the electrodes,cover the solution with a pair ofsplit watch glasses,and electrolyze at a current density of about0.6 A/dm2for about 16 h.Wash down the cover glasses,sidesof beaker,and electrode stems and continue electrolysis forabout 15 min.If no copper plates on the newly exposedcathode surface,copper deposition may be considered com-pleted.10.3 Quickly withdraw the cathode from the electrolytewhile directing a gentle stream of water from a wash bottleover its surface.Rinse the cathode in a water bath and then dipin