BS 6920 Pt.2 Sec.2.4-1988 人类消费用的与水接触的非金属产品对水质影响的适用性.第2部分:试验方法.第4节:水生微生物的生长
时间:2024-05-15 00:35:22 来源: 标准资料网 作者：标准资料网 阅读：9363
【英文标准名称】:Suitabilityofnon-metallicproductsforuseincontactwithwaterintendedforhumanconsumptionwithregardtotheireffectonthequalityofwater.Methodsoftest.Growthofaquaticmicroorganisms
【原文标准名称】:人类消费用的与水接触的非金属产品对水质影响的适用性.第2部分:试验方法.第4节:水生微生物的生长
【标准号】:BS6920Pt.2Sec.2.4-1988
【标准状态】:作废
【国别】:英国
【发布日期】:1988-05-31
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:接触食品的材料;非金属;微生物分析;水;生物分析和试验;给水和废物排放系统(建筑);试验条件;水质试验;细菌计数方法;假单胞菌目;生物测定;饮用水;大肠杆菌类;精密度
【英文主题词】:
【摘要】:
【中国标准分类号】:Z50
【国际标准分类号】:
【页数】:12P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforMeasurementofCorrosionPotentialsofAluminumAlloys
【原文标准名称】:铝合金潜在腐蚀性的标准试验方法
【标准号】:ASTMG69-1997(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【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】:G01.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aluminumalloy;aqueous;copper;corrosionpotential;sodiumchloride;solidsolution;zinc;Aluminumalloys--corrosiontesting;Corrosion--Al/Alalloys;Corrosion--metals/alloys
【摘要】:Thecorrosionpotentialofanaluminumalloydependsupontheamountsofcertainalloyingelementsthatthealloycontainsinsolidsolution.Copperandzinc,whicharetwoofthemajoralloyingelementsforaluminum,havethegreatesteffectwithcoppershiftingthepotentialinthenobleorpositivedirection,andzincintheactiveornegativedirection.Forexample,commerciallyunalloyedaluminum(1100alloy)hasapotentialofx2212;750mVwhenmeasuredinaccordancewiththispractice,2024x2013;T3alloywithnearlyallofitsnominal4.3%copperinsolidsolution,apotentialofx2212;600tox2212;620mV(Note2),and7072alloywithnearlyallofitsnominal1.0%zincinsolidsolution,apotentialofx2212;885mV(SCE)(1-3).Note28212;Thepotentialdependsupontherateofquenching.Becauseitreflectstheamountofcertainalloyingelementsinsolidsolution,thecorrosionpotentialisausefultoolforcharacterizingthemetallurgicalconditionofaluminumalloys,especiallythoseofthe2XXXand7XXXtypes,whichcontaincopperandzincasmajoralloyingelements.Itsusesincludethedeterminationoftheeffectivenessofsolutionheattreatmentandannealing(1),oftheextentofprecipitationduringartificialaging(4)andwelding(5),andoftheextentofdiffusionofalloyingelementsfromthecoreintothecladdingofalcladproducts(2).1.1Thistestmethodcoversaprocedureformeasurementofthecorrosionpotential(seeNote1)ofanaluminumalloyinanaqueoussolutionofsodiumchloridewithenoughhydrogenperoxideaddedtoprovideanamplesupplyofcathodicreactant.Note18212;Thecorrosionpotentialissometimesreferredtoastheopen-circuitsolutionorrestpotential.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H25
【国际标准分类号】:77_120_10
【页数】:4P.;A4
【正文语种】:英语