Hydrogen embrittlement of prestressing cables
Résumé
In this study, hydrogen embrittlement is simulated in an accelerated way with an ammonium thiocyanate media test. Damage evolution of prestressing strand is monitored with electrochemical measurements and with acoustic emission (AE). Three stages of the damage mechanism are identified with different acoustic activities. For each stage, three pattern parameters coming from AE analyse are highlighted to distinguish each emitting stage. To have a precise description of damage evolution of prestressing cables during the hydrogen embrittlement test, some interrupted tests have been used. For each interruption, metallographic observations enable to characterize degradation mechanisms. Finally, each acoustic stage has been correlated to a degradation mechanism. © 2010 Elsevier Ltd. All rights reserved.
Mots clés
Prestressing cables
Prestressing strands
SEM
Stress corrosion
Three stages
Acoustic emission testing
Acoustic emissions
Ammonium compounds
Cables
Degradation
Electrochemical corrosion
Hydrogen
Prestressed beams and girders
Prestressing
Residual stresses
Steel metallurgy
Stress corrosion cracking
Hydrogen embrittlement
Metallographic observations
Low alloy steels
Electrochemical measurements
Damage evolution
Damage mechanism
Degradation mechanism
Acoustic activity
Ammonium thiocyanate
B. EIS