GB 2841-1981 天然轻骨料
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来源:标准资料网
基本信息
| 标准名称： | 天然轻骨料 |
| 中标分类： |
建材 >>
建材产品 >>
混凝土、集料、灰浆、砂浆 |
| 替代情况： | 调整为JC/T 788-1981(1996) |
| 发布日期： | |
| 实施日期： | 1982-07-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 4页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 建材 建材产品 混凝土 集料 灰浆 砂浆
【英文标准名称】:StandardTestMethodforElectronicMeasurementforHydrogenEmbrittlementFromCadmium-ElectroplatingProcesses
【原文标准名称】:电镀镉工艺氢度化电子测量的标准试验方法
【标准号】:ASTMF326-1996(2006)
【标准状态】:现行
【国别】:
【发布日期】:1996
【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】:F07.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:氢脆;镉;金属覆层;电镀;金属的;航天技术;覆层;金属膜;试验;航空航天运输;金属;材料
【英文主题词】:cadmium;hydrogendetectioninstrument;hydrogenembrittlement
【摘要】:Hydrogenisevolvedduringmetalelectrodepositioninaqueousbaths.Someofthishydrogenenterspartsduringplating.Iftheabsorbedhydrogenisatalevelpresentingembrittlementhazardstohigh-strengthsteel,itisremovedbybakingpartsafterplatingtoexpelthishydrogen.However,thelackofplateporosityitselfmayblockhydrogenegress.Thus,itbecomesimportanttoknowboththerelativeamountofhydrogenabsorbedandtheplateporosity.Thistestprovidesaquantitativecontrolnumberforcadmiumplateporositythatcanbeusedtocontrolacadmiumplatingprocessandthestatusofcadmium-platedhardware.Itcanalsobeusedforplatingprocesstroubleshootingandresearchanddevelopmenttodeterminetheeffectsonplateporositybyprocessvariables,contaminants,andmaterials.Whenusedtocontrolacriticalprocess,controlnumbersforplateporositymustbedeterminedbycorrelationwithstressrupturespecimensorotheracceptablestandards.Thereisnoprimestandardforplateporosity.Forthisreason,twoovensmustbeused,withtestsalternatedbetweenovens.Datafromtheovensarecomparedtoensurenoequipmentchangehasoccurred.1.1Thistestmethodcoversanelectronichydrogendetectioninstrumentprocedureformeasurementofplatingpermeabilitytohydrogen.Thismethodmeasuresavariablerelatedtohydrogenabsorbedbysteelduringplatingandtothehydrogenpermeabilityoftheplateduringpostplatebaking.Aspecificapplicationofthismethodiscontrollingcadmium-platingprocessesinwhichtheplateporosityrelativetohydrogeniscritical,suchascadmiumonhigh-strengthsteel.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatement,seeSection8.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.
【中国标准分类号】:A29
【国际标准分类号】:25_220_40
【页数】:8P.;A4
【正文语种】:
MIL-STD-2039, DEPARTMENT OF DEFENSE STANDARD PRACTICE: FIELD CHANGES AND FIELD CHANGE KITS, PREPARATION OF (07 FEB 1992) [SUPERSEDES MIL-F-17655C] [NO S/S DOCUMENT]., This standard covers the development and preparation of fieldchanges and field change kits (evaluation and production), used to improve equipmentperformance, operational characteristics, maintenance, reliability andsafety.
