The Effect of Electrochemical Charge Transfer on Acoustic Signal in Corrosion Monitoring by Acoustic Emission Technique

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Chalermkiat Jirarungsatian
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Asa Prateepasen
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Medini Mukdasiri
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Abstract

The pitting corrosion of AISI 304 in diluted sodium chloride solution acidified to pH 2 andcontrolled by electrochemical process controller was studied. The relation between acoustic wavegeneration and the electrical charge transfer during corrosion process was carried out. The potentiodynamicmethod was used. The acoustic emission analysis via acoustic parameter showed good relation betweenthe acoustic signal characteristic and pitting corrosion mechanism based on electrochemical analysis.The explanation of the effect of charge transfer to acoustic signal was discussed in this paper. In addition,it was confirmed that pitting corrosion can be detected by Acoustic Emission technique.

Keywords : Corrosion / Electrochemical Analysis / Acoustic Emission

Article Details

Issue
Vol. 30 No. 2 (2007): April - June
Section
Original Articles
Author Biographies

Chalermkiat Jirarungsatian, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Researcher, Institute for Scientific and Technological Research and Services.

Asa Prateepasen, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Associate Professor, Department of Production Engineering.

Medini Mukdasiri, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Lecturere, Department of Production Engineering.