Use of electrochemical potential noise to detect initiation and propagation of stress corrosion cracks in a 17-4 PH steel
- UAEM, Cuernavaca (Mexico)
- Inst. de Investigaciones Electricas, Temixco (Mexico). Dept. de Fisicoquimica Aplicada
- Inst. Nacional de Investigaciones Nucleares, Toluca (Mexico). Dept. de Materiales
Corrosion potential transients were associated with nucleation and propagation of stress corrosion cracks in a 17-4 precipitation-hardenable (PH) martensitic stainless steel (SS) during slow strain rate tests (SSRT) at 90 C in deaerated sodium chloride (NaCl) solutions, Test solutions included 20 wt% NaCl at pH 3 and 7, similar to normal and faulted steam turbine environments, respectively. Time series were analyzed using the fast Fourier transform method. At the beginning of straining, the consistent noise behavior was perturbed with small potential transients, probably associated with rupture of the surface oxide layer. After yielding, these transients increased in intensity. At maximum load, the transients were still higher in intensity and frequency. These potential transients were related to crack nucleation and propagation. When the steel did not fail by stress corrosion cracking (SCC), such transients were found only at the beginning of the test. The power spectra showed some differences in all cases in roll-off slope and voltage magnitude, but these were not reliable tools to monitor the initiation and propagation of stress corrosion cracks.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 544072
- Journal Information:
- Corrosion, Vol. 53, Issue 9; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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