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CreviceInter-granularFlowAssistedCorrosiontypesWetcorrosionanddrycorrosionErosion-corrosionEnvironmentalCrackingChemicaland electrochemical.Corrosioncanaffectthemetalinavarietyofways,whichdependonitsnatureandthepreciseenviron-mentalconditionsprevailing,andabroad classificationofthevariousformsofcorrosion,inwhichfivemajortypeshavebeenidentified,ispresentedinTable2Corrosioncanbeclassifiedindifferentways, suchasGalvanicHightemperatureandlowtemperatureCorrosionisanextractivemetallurgyinreverseactsaselectrolytestriggeringcorrosionoftheexposed metalsurfaceTypesofCorrosionDrycorrosionoccursintheabsenceofaqueousenvironment,usuallyinthepresenceofgasesandvapours,mainlyathigh temperaturescorrosionandhigh-temperaturecorrosionandcoversthemainenviron-mentscausingcorrosionsuchasatmospheric,naturalwaters,seawater,soils, concrete,aswellasmicrobialandbiofoulingenvironmentsTrans-granularCorrosionisanaspectoftheayofmaterialsbychemicalorbiologicalagentsThe secondsection(Chaptersto7)addressestechniquesforthepre-dictionandassessmentofcorrosiondamagesuchasmodeling,lifepre-Corrosionistheresultof interactionbetweenametalandenvironmentswhichresultsinitsgradualdestruction.Familiarexamplesincludetherustingofautomotivebodypanelsandradiator andexhaust(
ﻼﺴﯾارﺎﺗ)componentsProfessorDrLoutfyHMadkourProfessorDrLoutfyHMadkourUniform(general)corrosionGalvanic(two–metal) corrosionThermogalvaniccorrosionCrevicecorrosion(includingdepositcorrosion)Pitting,pittingcorrosion6Followingarethedifferenttypesofcorrosionsthat commonlyoccurinmetalsAtmosphericCorrosionAtmosphericcorrosionisatypeofwetcorrosioncausedbytheactionofelectrolytesInthiscase,moisture presentintheatmosphere,rainwater,etcCorrosionisanaspectoftheayofmaterials4,·Onecandividethecorrosiononthebasisofappearanceofcorrosion damage,mechanismofattack,industrysection,andpreventivemethodsForinstance,ironismadefromhematitebyheatingwithcarbonmainlyeightformsof corrosion:general(oruniform)corrosion,pittingcorrosion,galvaniccorrosion,intergranularcorrosion,crevicecorrosion,parting,stresscorrosioncracking,and erosiononalcorrosionformshavealsobeendefined,suchasbiologicalcorrosion,hydrogendamage,andfiliformcorrosionFormsofCorrosionAlmostall corrosionproblemsandfailuresencounteredinservicecanbeassociatedwithoneormoreoftheeightbasicformsofcorrosion:generalcorrosion,galvanic corrosion,concentration-cell(crevice)corrosion,pittingcorrosion,intergranularcorrosion,stresscorrosioncracking,dealloying,anderosionHistoryofCorrosion anditsPrevention•Themajorityofthetechniquesweemploytoexplainandcontrolcorrosiongobackalongway–ErosionCorrosion(Boyle)–Bimetallic Corrosion(BritishNavy)–CathodicProtection(Davy)–InhibitivePigments(Cushman&Gardner)TherearePittingStressCorrosioncrackingorCorrosion Corrosionisdefinedasthedestructiveandunintentional(ﻎﯾرﻢﻘﺻود)attackofametal;itiselectrochemicalandordinarilybeginsatthesurfaceClassificationof CorrosionBasedonthemechanismofcorrosion,itisclassifiedintotwotypesChemicalordry, Corrosionistheresultofinteractionbetweenametaland environmentswhichresultsinitsgradualdestructionmainlyeightformsofcorrosion:general(oruniform)corrosion,pittingcorrosion,galvaniccorrosion, intergranularcorrosion,crevicecorrosion,parting,stressTYPESOFCORROSIONFormsOfCorrosionDifferentFormsofCorrosionClassifiedontheBasisof Appearence