A local additional potential model for pipeline stress corrosion cracking
A local additional potential model for pipeline stress corrosion cracking
- Neue Suche nach: Liu, Z.Y.
- Neue Suche nach: Cheng, Y.F.
- Neue Suche nach: Liu, Z.Y.
- Neue Suche nach: Cheng, Y.F.
A local additional potential model (LAPM) was developed to illustrate the role of strain rate in stress corrosion cracking (SCC) of pipelines. According to LAPM, both density and mobility of the local active spots on the steel surface, i.e., dislocation emergence points, increase linearly with strain rate. Generation of such active spots introduces an additional negative potential locally, affecting the electrochemical reaction and, consequently, the susceptibility of the steel to SCC. Electrochemical corrosion measurements, slow strain rate tests and electrochemical hydrogen permeation test were combined to demonstrate the validity of LAPM to illustrate pipeline SCC in an acidic soil solution. It is found that a maximum of the SCC susceptibility occurs at strain rate of 10minus 6/s, which is associated with an enhanced hydrogen evolution due to the local additional potential (LAP) effect.
Dokumentinformationen
A local additional potential model for pipeline stress corrosion cracking
Ein Modell des lokalen zusätzlichen Potenzials der Rissbildung durch Spannungsrisskorrosion in Pipelines
2010
8 Seiten, 4 Bilder, 11 Quellen
Aufsatz (Konferenz)
Englisch
Erdgasfernleitung , Rohrstahl , hochfester Stahl , ferritischer Stahl , Spannungsrisskorrosion , Spannungsrissbildung , Dehnungsgeschwindigkeit , Versetzungsdichte , Versetzungsbeweglichkeit , Versetzungsgleiten , elektrochemische Reaktion , elektrochemisches Potenzial , Korrosionsmechanismus , Wasserstoffversprödung , Modellierung
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