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07130 Investigating the Impact of Environment on Transgranular Stress Corrosion Cracking of Pipeline Steels

Picture for 07130 Investigating the Impact of Environment on Transgranular Stress Corrosion Cracking of Pipeline
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Product Number: 51300-07130-SG
ISBN: 07130 2007 CP
Author: Stefanie Asher and Preet Mohinder Singh
Publication Date: 2007
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Transgranular stress corrosion cracking (TGSCC) of buried carbon steel fuel transmission pipelines has been reported to occur on pipelines that are protectively coated and subjected to cathodic protection. The objective of this research was to investigate the conditions under which near-neutral pH environments can be formed. Specifically, this research focuses on how the pH of solutions change with applied potential and CO2 exposure. Potentiodynamic polarization tests were performed in solutions with different ground water constituents to see their role in anodic and cathodic behavior of pipeline steels. Application of cathodic protection alters the pH at the steel surface, shifting the environment outside of near-neutral pH conditions. Coupon exposure tests and potentiodynamic results suggest that the environment of TGSCC is possible in a wide range of temperatures and compositions.
Transgranular stress corrosion cracking (TGSCC) of buried carbon steel fuel transmission pipelines has been reported to occur on pipelines that are protectively coated and subjected to cathodic protection. The objective of this research was to investigate the conditions under which near-neutral pH environments can be formed. Specifically, this research focuses on how the pH of solutions change with applied potential and CO2 exposure. Potentiodynamic polarization tests were performed in solutions with different ground water constituents to see their role in anodic and cathodic behavior of pipeline steels. Application of cathodic protection alters the pH at the steel surface, shifting the environment outside of near-neutral pH conditions. Coupon exposure tests and potentiodynamic results suggest that the environment of TGSCC is possible in a wide range of temperatures and compositions.
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