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4300Catalog GeneralTechnical ReturnT CorrosionofBaseMetalsinContact I o ndex Thesusceptibilityofdifferentbasemetalstocorrosionwhilein thepotentialforcorrosionisveryhigh.Aluminum,beingmore contact,dependsuponthedifferencebetweenthecontactpo- anodicmetal,willcorrodeinthiscombination. tentials,ortheelectromotivevoltagesofthemetalsinvolved.The Asageneralguideline,ifthemetalsarehalfthelengthofthe greaterthepotentialdifferenceis,thegreateristhetendencyfor chartormoreapart,thecombinationshouldbeavoided.Also, corrosion.ThemetalwiththehigherpotentialformstheanodeowsfromplustominusflElectriccurrent itisnotagoodideatocombineananodicmetalpartwiththin andiscorroded.Inotherwords,thelargertheseparationdistance intheelectromotivechartbetweenthetwometalsincontact,Directionofattackcrosssection,suchasthinwalltubing,withacathodicorless anodicmetalpartofaheavycrosssection,suchasafitting. thehigherthecontactpotentialandchancesforcorrosion.For example,zincandaluminumareveryshortdistanceapartinthe Example:Athinwallbrasstubewithsteelfittingisabetter, chart;thereforepotentialforcorrosionwhenthesetwometalsare althoughnotideal,combinationthanathinwallsteeltubewith incontactisverylow.Ontheotherhand,aluminumandpassiv- brassfitting. ated316stainlesssteelarefarapart;hence,whenincontact, ElectromotiveorGalvanicSeriesforMetals +Anodic Magnesium (leastnoble) Magnesiumalloys Zinc(Parkersteelfittingsarezincplated) corroded Berillium Aluminum5052,3004,3003,1100,6053 Cadmium Aluminum2117,2017,2024T4 Mildsteel(1018),wroughtiron,freemachiningsteel(12L14) Lowalloyhighstrengthsteel,castiron Chromeiron(active) 430Stainless(active) 302,303,321,347,410,416,stainlesssteel(active) Ni-resist 316,317stainlesssteel(active) Carpenter20Cb-3stainless(active) Aluminumbronze(CA687) HastelloyC(active)Inconnel625(active)Titanium(active) Lead/Tinsolder Lead Tin Inconnel600(active) Nickel(active) 60Ni-15Cr(active) 80Ni-20Cr(active) HastelloyB(active) Navalbrass(CA464),Yellowbrass(CA268),Brass(CA360) Redbrass(CA230),Admiraltybrass(CA443) Copper(CA102) Maganesebronze(CA675),Tinbronze(CA903,905) 410,416Stainless(passive)Phospherbronze(CA521,524) Siliconbronze(CA651,655) Nickelsilver(CA732,735,745,752,754,757,764,770,794) CuproNi90-10 CuproNi80-20 430Stainlesssteel(passive) CuproNi70-30 Nickelaluminumbronze(CA630,632) Monel400,K500 Silversolder Nickel(passive) 60Ni15Cr(passive) Inconnel600(passive) 80Ni20Cr(passive) Chromeiron(passive) 302,303,304,321,347stainlessstainlesssteel(passive) 316,317stainlesssteel(passive)(Parkerstainlesssteelfittingsarepassivated) Carpenter20Cb-3stainless(passive),Incoloy825 Silver Titanium(passive),HastelloyC&C276(passive),Inconnel625(passive) Graphic -Cathodic Zirconium (mostnoble) Gold protected Platinum TableU5--ElectromotiveorGalvanicSeriesforMetals U12 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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