A local additional potential model for pipeline stress corrosion cracking
A local additional potential model for pipeline stress corrosion cracking
- New search for: Liu, Z.Y.
- New search for: Cheng, Y.F.
- New search for: Liu, Z.Y.
- New search for: 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.
Document information
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
Conference paper
English
Erdgasfernleitung , Rohrstahl , hochfester Stahl , ferritischer Stahl , Spannungsrisskorrosion , Spannungsrissbildung , Dehnungsgeschwindigkeit , Versetzungsdichte , Versetzungsbeweglichkeit , Versetzungsgleiten , elektrochemische Reaktion , elektrochemisches Potenzial , Korrosionsmechanismus , Wasserstoffversprödung , Modellierung
Similar titles
Monitoring stress corrosion cracking in a working gas pipeline
| Tema Archive | 1999
Mechanistic investigation of deflected stress corrosion cracking in pipeline steels
| Tema Archive | 2009
New technique monitors pipeline corrosion, cracking
| Tema Archive | 1993