Page 121 - 腐蚀与防护2024年第十一期

李海坤, 等: 电流动态波动对管道腐蚀速率的影响

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InfluenceofD y namicCurrentFluctuationonPi p elineCorrosionRate

1 2 3 , 4 2 3 , 4 3 , 4 2
DuanBin gq uan , WANG Leilei , LIHaikun , HANChan g chai , LIUZhen j un , LIZhen g min , LIUYon g

( 1.ChinaPetroleumPi p elineEn g ineerin gCom p an yCo. , Ltd.International , Lan g fan g 065000 , China ;

2.Pi p eChinaWest-EastGasTransmissionBranch , Shan g hai200122 , China ;

3.ChinaPetroleumPi p elineResearchInstituteCo. , Ltd. , Lan g fan g 065000 , China ;

4.NationalEn g ineerin gResearchCenterforOilandGasTransmissionSafet y , Lan g fan g 065000 , China )

Abstract : Inordertoevaluatethecorrosionriskofd y namicDCstra y currentinter ference , testcou p onsforfreecorrosionand

cathodic p rotectionwereburiedalon gap i p eline.Thefreecorrosionp otentials , cathodicp otentials ( switch-onandswitch-off

p otentials ), corrosionratesofthetestcou p onsandsoilresistivit yattheburiedp ointsweretested.Theinfluenceofcurrent

fluctuationoncorrosionratewasinvesti g atedb y com p arin g thecorrelationbetweencorrosionrateandsoilresistivit y , aswellas

thecorrelationbetweencorrosionrateandcathodic p rotectionp arameters.Theresultsshowthatthemeasuredcorrosionrates

were g enerall y hi g herthantheevaluationresultsbasedonsoilresistivit y .Thecorrosionrateswereincreasedb y d y namicstra y

current.Ap arameterofd y namicstra y currentfluctuationintensit y I fwasdefined.Theinfluenceofd y namicDCstra y current

fluctuationontheeffectivenessofcathodic p rotectionwasabout0.06I f.Accordin g tothe p olarizationp otentialdifferenceand

,
I f thetotale q uivalentcorrosioncurrentwascalculatedb yTafelformula.ThePearsoncorrelationcoefficientbetweenthe

currentandthemeasuredcorrosionratewasashi g has0.97.Thesumofthe p olarization p otentialdifferenceand0.06I f canbe

usedtoevaluatetheeffectivenessofthe p i p elinecathodic p rotectionunderd y namicDCstra y currentinterference.

Ke ywords : d y namicstra y current ; fluctuation ; p i p eline ; cou p on ; cathodic p rotection ; corrosionrate
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