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08411 Hydrogen Production and Permeation of X-65 Pipeline Steel in Near Neutral pH Environments

Picture for 08411 Hydrogen Production and Permeation of X-65 Pipeline Steel in Near Neutral pH Environments
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Product Number: 51300-08411-SG
ISBN: 08411 2008 CP
Author: Stefanie Asher and Preet Singh
Publication Date: 2008
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Transgranular stress corrosion cracking (TGSCC) is a failure that occurs on buried carbon steel fuel transmission pipelines that are protectively coated and subjected to cathodic protection. Analysis of failed pipelines and previous research indicate that hydrogen is involved in the cracking process. However, the exact mechanism of crack initiation and hydrogen generation in near-neutral pH solutions was not clear. The objective of this research was to further understanding of the mechanism of TGSCC by determining the possible methods of hydrogen production and hydrogen diffusion into the pipeline steel. Specifically, this research focuses on the production of hydrogen through the interaction of iron with carbonic acid and bicarbonate. Hydrogen permeation testing and coupon exposure tests were used to understand the role of hydrogen in TGSCC. Effect of heat treatment and microstructure of X-65 pipeline steel of hydrogen diffusion was determined.
Transgranular stress corrosion cracking (TGSCC) is a failure that occurs on buried carbon steel fuel transmission pipelines that are protectively coated and subjected to cathodic protection. Analysis of failed pipelines and previous research indicate that hydrogen is involved in the cracking process. However, the exact mechanism of crack initiation and hydrogen generation in near-neutral pH solutions was not clear. The objective of this research was to further understanding of the mechanism of TGSCC by determining the possible methods of hydrogen production and hydrogen diffusion into the pipeline steel. Specifically, this research focuses on the production of hydrogen through the interaction of iron with carbonic acid and bicarbonate. Hydrogen permeation testing and coupon exposure tests were used to understand the role of hydrogen in TGSCC. Effect of heat treatment and microstructure of X-65 pipeline steel of hydrogen diffusion was determined.
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