标准名称：	照相镜头渐晕系数及象面照度均匀度测量方法
中标分类：	仪器、仪表 >> 电影、照相、缩微、复印设备 >> 镜头
替代情况：	调整为JB/T 8248.3-1995
发布日期：	1900-01-01
实施日期：	1996-11-01
首发日期：	1900-01-01
作废日期：	1900-01-01
出版日期：	1900-01-01
页数：	6页

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【英文标准名称】:StandardTestMethodforConductimetricAnalysisofWaterSolubleIonicContaminationofBlastingAbrasives
【原文标准名称】:喷射磨料的水溶离子污染电导定量分析的标准试验方法
【标准号】:ASTMD4940-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D01.46
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:abrasive;analysis;blasting;chloride;conductimetric;conductivity;contamination;interlaboratorytesting;ionogenic;precision;salts.;steelsurfaces;Abrasiveblasting;Calibration;Conductanceandconductivity(electrical);Conductimetricanalysi
【摘要】:By-productabrasivesmanufacturedfromslagsthatareaircooledorquenchedwithpurewater,normallycontainlowconcentrationsofionicmaterials,asdominedmineralabrasives.However,slagsquenchedwithseawaterorothercontaminatedwater,containhighamountsofionicmaterialasdoesseashoresand.Thiscontaminationoftheabrasivecantransfertothesteelsurfacesbeingblasted,whereitmayacceleratecorrosion.Thistestisusefulinestablishingthecleanlinessoftheabrasiveatthejobsite.Thistestmethodprovidesavaluethatindicatestheconcentrationoftotalwatersolubleionsbasedontheirelectrolyticmobility.Thus,itprovidesanindicationofioniccorrosionpotential.Note18212;Atypicalvalueofconductivityforahighlevelofcontaminationis500x03BC;mho/cm.Atypicalvalueforalowlevelofcontaminationis50x03BC;mho/cm.1.1Thistestmethoddescribesaprocedureforrapidevaluationofabrasivesforthepresenceofioniccontaminationbydeterminingthetotalconcentrationofwatersolubleioniccontaminantsbymeansofaconductivitytest.1.2Thistestmethoddoesnotidentifytheionicspeciespresentnorprovidequantitativeresultsoneachspecies.1.3Thistestmethodisbasedonavolumecomparisonamongabrasivesofsimilarsizes.Avolumecomparisonismorecloselyrelatedtosurfaceareaoftheabrasivesthanisaweightcomparison.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A29
【国际标准分类号】:25_220_10
【页数】:3P.;A4
【正文语种】:英语