|
|
EFFECTS OF ENVIRONMENTAL SOLUTIONS ON ELECTROCHEMICAL EHAVIORS RELATED TO SCC OF PIPE LINE STEELS |
Maocheng Yan;Yongji Weng |
北京石油大学 |
|
|
Abstract The electrochemical behaviors of X70 and 16Mn pipeline steels were studied in a range of CO32-/HCO3- solutions using the fast and slow sweep potentiodynamic polarization measurements and so on. Effects of the bicarbonate concentration,pH,oxygen concentration in the solution and the sweep rate et al.On the polarization curves were analyzed.The electrode reactions in passive process were also investigated.It was shown that the anodic polarization curves of steels in cincentrated CO32- / HCO3- solutions exhibited characteristic features,namely two oxidation peaks and an intermediate zone between. The situations with more negative potential of first oxidation peak and larger currents in first oxidation peak are likely to promote SCC.These situation are also linked to high concentration HCO3-,moderate pH range (6.7-11 at ambient temperature )and lack of oxygen in solutions.
|
Received: 28 July 2003
|
|
Corresponding Authors:
Maocheng Yan
E-mail: yan_maoch@sina.com
|
[1]McClureGM .Fieldfailureinvestigations[A ].SymposiumonPipelineResearch[C].Dallas,TX ,USA ,1965 [2]HusseinK ,ShaukatA ,HassanF .Corrosioncrackingofgascarryingpipelines[J].MaterialsPerformance,1988:13 [3]ParkinsRN .Areviewofstresscorrosioncrackingofhigh-pres suregaspipelines[A].Corrosion/2000[C].Houston,NACEinter nationalTx,2000,363 [4]YanMC ,WengYJ.Studyonlocalenvironmentevolutionunderdisbondedcoatingoncathodicprotectedpipelines[J].J .Chin.Soc.Corros.Prot.,2004,24(2):95-99(闫茂成,翁永基.阴极保护管线破损涂层下局部环境变化规律[J]中国腐蚀与防护学报,2004,24(2):95-99 [5]ZuoJY ,StressCorrosionCracking[M].Xi′an:PublishingCompanyofXi’anTrafficUniversity,1985:13,23(左景伊.应力腐蚀破裂[M ].西安:西安交通大学出版社,1985:13,23 [6]PilkeyAK ,LambertSB ,PlumtreeA .StresscorrosioncrackingofX60pipelinesteelinacarbonate-bicarbonatesolution[J].Corro sion,1995,51(2) [7]ParkinsRN ,ZhouS .ThestresscorrosioncrackingofC -MnsteelinCO2-HCO-3-CO2-3solutions.II :electrochemicalandotherda da[J].Corros.Sci.,1997,39:175-191 |
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|