Introduction-to-CorrosionVIP专享VIP免费

IntroductiontoCorrosionLecture#012DefinitionCorrosionmaybedefinedasthedestructionofametaloranalloybecauseofchemicalorelectrochemicalreactionwithitssurroundingenvironmentormediumametaloranalloyenvironmentormedium3EnvironmentsinCorrosion11Sheir,L.L.,R.A.Jarman,andG.T.Burstein,eds.Corrosion.3rded.Vol.1.2000,Butterworth-Heinemann:Oxford.4Corrosion:MetallurgyinReverse22Fontana,M.G.,CorrosionEngineering.3rded.1986,NewYork:McGraw-Hill.SomeCorrosionFailureExamples33CorrosionDoctorsWebsite.Homepage:http://www.corrosion-doctors.org6AlohaIncident7AlohaIncident(Contd..)8BhopalAccident9CarlsbadPipelineExplosion10FlowAcceleratedCorrosion11NuclearReactorwithaHoleintheHead12LossesduetoCorrosion44Uhlig,H.H.andR.W.Revie,CorrosionandCorrosionControl.3rded.1985,NewYork:JohnWiley&Sons.13CostofCorrosionWhichcostmore?CorrosionFireFloodingEarthquake14CostofCorrosion(2004)inbillionUS$5CountryDirectCostIndirectCostUSA303.76200(approximately)Japan59.02FormerUSSR55.01Germany49.26UK8.51Australia7.32Belgium6.75India3.78Poland3.53Canada3.38...............Global510.14940(approximately)5Bhaskaran,R.,N.Palaniswamy,andN.S.Rengaswamy,GlobalCostofCorrosion—AHistoricalReview,inCorrosion:Materials,Vol13B,ASMHandbook.2005,ASMInternational.15ExampleofOverdesign3An8"in.diaoilpipeline225mileslongwithain.wallthicknesswasinstalledwithnocorrosionprotectionsystemWithappropriateprotectionnamelycathodicprotection,itwouldhaveathinwallthicknesswhichwouldsave3,700tonsofsteel(worthmorethanonemilliondollar)increaseinternalcapacityofthepipelinebyabout5%.16So……WhyStudyCorrosion?MaterialsarepreciousresourcesEngineeringdesignisincompletewithoutknowledgeofcorrosionApplyingknowledgeofcorrosionprotectioncanminimizedisastersCorrosion–contaminateproductssuchaspharmaceutical,foodanddairyproductsorluxuryitemslikesoapCorrosionproducts–threattotheenvironmentArtificialimplantsforthehumanbody!!!17Distributionofdisciplinesinwhichactivecorrosionengineershavegraduated18So..WhatwouldbeexpectedfromYou(aCorrosionEngineer)?EnsuringmaximumlifeofnewequipmentPreservationofexistingequipmentProtectingorimprovingthequalityofaproductinordertomaintainorimproveacompetitiveposition.Avoidingcostlyinterruptionsofproduction.Reducingoreliminatinglossesofvaluableproductsbyspillageorleaks.Refittingofequipmentwithdrawnfromservicebecauseofcorrosion.Reducinghazardstolifeandpropertythatmightbeassociatedwithcorrosion:Explosionsofpressurevesselsorpipingsystemsreleaseofpoisonousorexplosivegasesorvaporsareafewexamples.