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99151 APPLICATION OF ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS) FOR MONITORING OF SCCCRACKS

Picture for 99151 APPLICATION OF ELECTROCHEMICAL IMPEDANCE
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Product Number: 51300-99151-SG
ISBN: 99151 1999 CP
Author: R.W. Bosch, F. Moons, J.H. Zheng and W.F. Bogaerts
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It was investigated if Electrochemical Impedance Spectroscopy (EIS) could be used for the monitoring of Stress Corrosion Cracking (SCC). First a model was developed that described the impedance response of a cracked surface, i.e. the model could distinguish between a flat electrode surface and a surface with cracks. Experiments with stainless steel electrodes with artificial “cracks” (electrically drilled small holes) in 0.1 M Na2SO4 showed that the influence of the artificial “cracks” on the impedance response was mainly reflected in the phase shift at frequencies between 100 and 1 Hz. To generate real stress corrosion cracks, Slow Strain Rate Tests (SSRT) were performed with sensitised SS 304 specimen in a 5 N H2SO4+ 0.1 M NaCl solution at room temperature. Analysis of the fi-acture surface clearly shows intergranular attack, suggesting that stress corrosion cracks were formed. Impedance measurements were performed tsvice an hour during experiments with stress (SSRT) and without stress. Phase shifts at frequencies 100 and 10 Hz showed a clear difference between the results with stress and without stress suggesting that stress corrosion cracks were detected by the impedance measurements. Keywords: Stress Corrosion Cracking, Electrochemical Impedance Spectroscopy,Slow Strain Rate Test, stainless steel
It was investigated if Electrochemical Impedance Spectroscopy (EIS) could be used for the monitoring of Stress Corrosion Cracking (SCC). First a model was developed that described the impedance response of a cracked surface, i.e. the model could distinguish between a flat electrode surface and a surface with cracks. Experiments with stainless steel electrodes with artificial “cracks” (electrically drilled small holes) in 0.1 M Na2SO4 showed that the influence of the artificial “cracks” on the impedance response was mainly reflected in the phase shift at frequencies between 100 and 1 Hz. To generate real stress corrosion cracks, Slow Strain Rate Tests (SSRT) were performed with sensitised SS 304 specimen in a 5 N H2SO4+ 0.1 M NaCl solution at room temperature. Analysis of the fi-acture surface clearly shows intergranular attack, suggesting that stress corrosion cracks were formed. Impedance measurements were performed tsvice an hour during experiments with stress (SSRT) and without stress. Phase shifts at frequencies 100 and 10 Hz showed a clear difference between the results with stress and without stress suggesting that stress corrosion cracks were detected by the impedance measurements. Keywords: Stress Corrosion Cracking, Electrochemical Impedance Spectroscopy,Slow Strain Rate Test, stainless steel
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