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ID:44078561
大小:119.63 KB
页数:10页
时间:2019-10-18
《Environmental Corrosiveness Classification》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、CombinationCorrosionCouponTestingNeededforTodaysControlEquipmentAccuratereliabilityanalysesforelectronic/electricaldevicesinpulpandpapermillsrequiresilverandgoldcouponsinadditiontocopperC.O.MullerPurafil,Inc.2654WeaverWayDoraville,Georgia30340INTRODUCTIONCopper,silver,andgoldareimp
2、ortantfunctionalmaterialsfoundinmanyoftheelectrical/electronicdevicesinuseintoday'spulpandpapermillcontrolrooms.Thereliabilityofthesedevicesmaybegreatlyaffectedbythepresenceofcorrosivegasesinthelocalenvironment.Eventracelevelsofthesegasescancausefailuresduetotheformationofcorrosion
3、productsinandonthecircuitryandconnectorsofthesedevices.Andduetothenatureoftheprocessesinvolvedinpapermanufacturing,itisalmostacertaintythatthesedeviceswillatsometimebeexposedtocorrosivegases.Atmosphericcorrosionofcopperhasbeenstudiedextensivelyandtestshavebeendevisedtomeasuretherat
4、esofcoppercorrosion.Thesecorrosionratesarecurrentlybeingusedtogaugeelectrical/electronicequipmentreliability.Thehighertherateofcoppercorrosion,thehighertheprobabilityofequipmentdamageand/orfailure(duetocorrosion).StudiesofbothlaboratoryandfielddatacollectedbyPurafil,Inc.hasshowntha
5、tusingcoppercorrosionaloneasagaugeforequipmentreliabilitycanseriouslyunderstatethecorrosivepotentialofthelocalenvironment.Examinationofbothsilverandgoldcorrosiondatahaveshowninstancesofanenvironmentwhichisnoncorrosivetocopperbeingextremelycorrosivetosilverand/orgold.Itisbecauseofre
6、sultssuchasthesethatanytestingwhichattemptstopredictelectrical/electronicequipmentreliabilityshouldincorporatecopper,silver,andgoldcorrosionasdeterminants.CURRENTSTANDARDSANDMETHODOLOGIES1TheInstrumentSocietyofAmerica(ISA)publishedastandardwithwhichtoclassifyairbornecontaminantstha
7、tmayaffectprocessmeasurementandcontrolsystems.Thispresentedthemanufacturersandusersofelectrical/electronicdevicesawaytopredictthereliabilityofthosedevicesexposedtocorrosivegases.Onemethodinvolvestheuseofspeciallypreparedcoppercoupons.Thesecouponsareplacedinthelocaloperatingenvironm
8、entforaperiodoftime,usuall
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