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08408 The Effect of Pressure on Hydrogen Charging of Carbon Steel Under Cathodic Protection

Picture for 08408 The Effect of Pressure on Hydrogen Charging of Carbon Steel Under Cathodic Protection
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Product Number: 51300-08408-SG
ISBN: 08408 2008 CP
Author: Frank Dean, Christopher Fowler, Stephen Powell, and Bishrut Mukherjee
Publication Date: 2008
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The mechanism of hydrogen uptake by steel in various environments is reviewed, in order to understand their propensity to cause hydrogen damage, as indicated by hydrogen entry activities at the steel subsurface. We then consider whether hydrogen damage is likely to be induced in cathodically protected steel, supported by new and previously published data. It is concluded that cathodic protection of steel in environments not containing hydrogen promoters such as sour gas probably generates hydrogen activities not exceeding ambient pressure. The hydrogen activity in the deep sea, at 400 bar, is considered low in comparison with activities commonly associated with sour environments, but it might induce cracking in an already highly hydrogen susceptible weldment, say. A mild charging solution is suggested to simulate the hydrogen charging activity induced by cathodic protection sub-sea.
The mechanism of hydrogen uptake by steel in various environments is reviewed, in order to understand their propensity to cause hydrogen damage, as indicated by hydrogen entry activities at the steel subsurface. We then consider whether hydrogen damage is likely to be induced in cathodically protected steel, supported by new and previously published data. It is concluded that cathodic protection of steel in environments not containing hydrogen promoters such as sour gas probably generates hydrogen activities not exceeding ambient pressure. The hydrogen activity in the deep sea, at 400 bar, is considered low in comparison with activities commonly associated with sour environments, but it might induce cracking in an already highly hydrogen susceptible weldment, say. A mild charging solution is suggested to simulate the hydrogen charging activity induced by cathodic protection sub-sea.
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