Acoustic emission (AE) during pitting corrosion of 304 stainless steel (304 SS) in H(2)SO(4) solutions with different pH values and Cl(-) concentrations was studied. Two types of AE signals are detected in all solutions. Each type of signals is characterized by AE parameters (rise time, counts number, duration and amplitude) and waveform carefully. It is believed that the hydrogen bubbles evolution inside the pits is the AE source. (c) 2011 Elsevier Ltd. All rights reserved.
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