长距离石油埋地管线阴极保护技术

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1、CATHODICPROTECTIONPEFRANCISCONTENTS1INTRODUCTION............................................................................................................22PRINCIPLESOFCATHODICPROTECTION..........................................................33MET

2、HODSOFAPPLYINGCATHODICPROTECTION........................................53.1IMPRESSEDCURRENT..........................................................................................53.2SACRIFICIALANODES................................................

3、..........................................64DESIGN............................................................................................................................84.1PROTECTIONPOTENTIALS.....................................................

4、............................84.2CURRENTDENSITY...............................................................................................84.3COATINGS..................................................................................................

5、.............94.4CALCAREOUSSCALES.........................................................................................94.5CHOICEOFCATHODICPROTECTIONSYSTEM..............................................94.6ANODERESISTANCE............................

6、..............................................................104.7DANGERSTOBEAVOIDED...............................................................................121[CATHODICPROTECTION/BM]CATHODICPROTECTIONPEFRANCIS1INTRODUCTIONThefirstpracticaluseo

7、fcathodicprotectionisgenerallycreditedtoSirHumphreyDavyinthe1980s.Davy’sadvicewassoughtbytheRoyalNavyininvestigatingthecorrosionofcoppersheetingusedforcladdingthehullsofnavalvessels.Davyfoundthathecouldpreservecopperinseawaterbytheattachmentofsmallqua

8、ntitiesofironorzinc;thecopperbecame,asDavyputit,“cathodicallyprotected”.Themostrapiddevelopmentofcathodic-protectionsystemswasmadeintheUnitedStatesofAmericatomeettherequirementsoftherapidlyexpandingoilandnaturalgasindustrywhichwantedtobenefitf