Acoustic emission during the electrochemical corrosion of 304 stainless steel in H2SO4 solutions |
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| Authors: | Jian Xu Xinqiang Wu En-Hou Han |
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| Affiliation: | State Key Laboratory for Corrosion and Protection, Liaoning Key Laboratory for Nuclear Material and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016 Shenyang, PR China |
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| Abstract: | Acoustic emission (AE) behaviour during the electrochemical corrosion of 304 stainless steel (304SS) in H2SO4 solutions was studied. AE signals which related to transpassive dissolution are detected in solutions with low pH, and are very slightly influenced by current density and pre-strain. During hydrogen bubble evolution, a weak correlation exists between the AE signal amplitude and the hydrogen bubble diameter. The concept of potential – pH – AE diagram is proposed and such a diagram is drawn based on AE activity and b-values. The main mechanisms of AE sources which are transpassive dissolution and hydrogen bubble evolution, are also discussed. |
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| Keywords: | A. Acid solutions A. Stainless steel B. Polarization C. Acid corrosion C. Transpassivity |
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