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97202 ELECTROCHEMICAL AND STRESS CORROSION CRACKING BEHAVIOUR OF MICRO-ALLOYED STEELS IN CO2/HCO3- ENVIRONMENT

Picture for 97202 ELECTROCHEMICAL AND STRESS
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Product Number: 51300-97202-SG
ISBN: 97202 1997 CP
Author: Ennio Sinigaglia, Marina Cabrini
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Transgranular Stress Corrosion Cracking (TGSCC) is a relatively recent form of stress corrosion cracking of buried gas and oil pipelines. Aim of the present work is to evaluate the electrochemical and SCC behaviour of micro alloyed steels in CO2/HCO3- environment in order to better define the mechanisms involved in TGSCC. It has been shown that in TGSCC environment all the tested steels remain active. It is the presence of the couple CO2/HCO3- and of a pH around seven to play a major rule in the TGSCC. There are strong evidences that TGSCC is caused by the entrance of atomic hydrogen into the metal, hindered by the presence of corrosion products due to the environment. Temperature seems to inhibit TGSCC. No SCC was obtained by constant load and constant deformation tests.
Transgranular Stress Corrosion Cracking (TGSCC) is a relatively recent form of stress corrosion cracking of buried gas and oil pipelines. Aim of the present work is to evaluate the electrochemical and SCC behaviour of micro alloyed steels in CO2/HCO3- environment in order to better define the mechanisms involved in TGSCC. It has been shown that in TGSCC environment all the tested steels remain active. It is the presence of the couple CO2/HCO3- and of a pH around seven to play a major rule in the TGSCC. There are strong evidences that TGSCC is caused by the entrance of atomic hydrogen into the metal, hindered by the presence of corrosion products due to the environment. Temperature seems to inhibit TGSCC. No SCC was obtained by constant load and constant deformation tests.
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