循环水不锈钢换热器抗氯离子应力腐蚀研究

Corrosion＆ProtectioninPetrochemicalIndustry2012291·36·315207、40%30%～45%1/3Cl－。Cl－、pH。50～80℃pH8Cl－1000mg/L。、U、。。TE965A1007－015X201201－0036－052011－10－082011－11－29。。[e-mail]。Cl－Cl－SCC。Cl－。1Cl－、、pH、pH。1.1Cl－-Cl－F－Br－H2SxO6H2S。Cl－Cl－。1Cl－。、。Cl－Cl－mg/LCl－。Cl－Cl－。GB150-1998《》Cl－25mg/L。。1.2Cl－。。。100℃。。。Cl－。Cl－1．。。1Truman2。Money3IGSCC。pH。250℃50℃。Cr-Ni50～300℃。Cl－41。118Cr-8Ni100℃Cl－100～1000mg/L。100℃316L5。105104103102101100ρ(Cl-)/(mg·L-1)0100200300400温度/℃焊接区破裂非焊接部位破裂图1曲线是非焊接部位产生ＳＣＣ的下限Ｆig.1Thecurveisalowerlimitofwhichformingsccinnowelding3120～200℃120～200℃Cl－10～50mg/L18-8Cl－。200℃2mg/LCl－、。12～18mg/LCl－。120℃Cl－10mg/L。200℃Cl－2mg/LCl－。Cl－Cl－pH。1.3pHpH。pHpH。pH6～718-8。pHCl－pH。pH1.2～2.06。pHCl－。Bianchi70.1～1moL/LHClHCl。1.48－9。。3。。。。。。。。·73·29。Cl－。、。。。1．510。Cl－。Cl－11－12。Cl－10μg/g120℃Cl－。22.10Cr18Ni90Cr18Ni9Ti。。3、U。2.2Cl－。50～80℃Cl－600～700mg/L。3a。Cl－1000～2000mg/L。2.32.3.1、。2.3.2UURR。2.3.3。2.3.42V2011A2012A。2.3.5、。2.42V2011A2012A23。2V2011A2。。3V2012AV2011A。。·83·1．2V2011AFig．2CorrosiononV2011Aexchanger3V2012AFig．3CorrosiononV2012Aexchanger31Cl－Cl－pH。Cl－Cl－250～80℃pH8Cl－1000mg/LCr-Ni3Cl－4U。5U6。。1．Cl－J．1998252106.2TrumanJE．TheInfluenceofChlorideContentpHandTemperatureofTestSolutionsontheOccurrenceofSCCwithAusteniticStainlessSteelsJ．CorrosionScience19761711737．3MoneyKLKirkWW.SCCBehaviorofWroughtFe2Cr2NiAlloysinMarineAtmosphereJ.MaterPerformance19781748.4.-M.1981.11.5.316LH2SCl－J.200128279.6BakerHRetal.FilmandpHeffectsinthestresscorrosioncrackingoftype304SSJ.Corrosion19702610420.7BianchiGMazzaF．SCCofausteniticstainlesssteelinhydrochloricacidmediaatroomtemperatureJ．CorrosionScience1972142165.8.E7009IIJ.200017325.9.J．2005263120.10.J.200239253．11.100M.2000208.12.M.1987180.·93·29StudyonResistanceAgainstStressCorrosionoffChlorineIonsofCoolingWaterStainlessSteelHeatExchangersDongShaopingSINOPECZhenhaiRefiningandChemicalCompanyNingboZhejiang315207AbstractTheheatexchangersinpetroleumrefineriesandchemicalplantsaccounttoabout40%ofthetotalequipmentquantityand30%～45%oftotalequipmentinvestment．Inheatexchangeequipmentonethirdiswatercooler．ThestainlesssteelheatexchangersaresubjecttostresscorrosioncausedbyCl－incoolingwaterwhichwilllimittheincreaseofconcentrationofcoolingwatersystem．TheinvestigationstudyconfirmsthattheCl－contentandtemperatehaveagreaterimpactonthecorrosionandpHvaluealsohasacertaininfluence．Atatemperatureof50～80℃andpHvalueof8themaximummassconcentrationofCl－inindustrycoolingwatercanbeashighas1000mg/L．ThestresscorrosioncrackingSCCoftubeheatexchangersandcoilheatexchangersisintroduced．ThefieldinvestigationhasfoundthatthelocationswhicharesubjecttostresscorrosioninheatexchangeraremainlyexpandedconnectionsbentofUtuberodbafflesheatexchangertubesetc．Itissuggestedtohavecoupontestingincoolingwatersystemtofurtherstudytheimpactofdifferentfactorsanddifferentlocationsonstresscorrosionsoastoproposeappropriatecorrosionprotectionmeasures．KeywordsstainlesssteelheatexchangerCl－櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏櫏stresscorrosion2015201017%《“”》。2015。、、、、。2015201017%。、、、、。、。。。20153201016%。。。。。《》27“”。“”、。———100050、、、、、、8、、、。2015、8Mt/a13.5Mt/a12.5Mt/a18Mt/a。。2015、636401．8。《》·04·