Abstract
A new duplex 25Cr-3Ni-7Mn-0.66 N alloy was prepared in a vacuum arc re-melting furnace and characterized by metallographic and EPMA methods. Its corrosion behavior was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and a Mott-Schottky (M-S) analysis in artificial seawater at room temperature and compared with those of super and normal commercial duplex stainless steel (SDSS and DSS). No significant difference in the open circuit potentials and pitting potentials was observed. Its passive film current density lies between those of SDSS and DSS. This was confirmed by EIS analysis. A pit attack was observed on the δ-phase for all duplex samples, because the PREN16 of the δ-phase was lower than that of the γ-phase. From the Mott-Schottky analysis, the passive films were found to be composed of bi-layer structures, a p-type semiconductor inner layer, and a n-type semiconductor outer layer. The degree of defect as well as the effect of nitrogen in passive film layer are discussed with respect to the point defect model.
About the authors
Songkran Vongsilathai, born in 1995, is a Graduate Student in the Department of Metallurgical Engineering, Chulalongkorn University, Bangkok, Thailand. He received his Bachelor’s degree in Metallurgical and Materials Engineering from King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand in 2017. His current research theme involves an electrochemical corrosion test.
Assoc. Prof. Dr. Anchaleeporn W. Lothongkum, D. Eng. (Kyoto University), born in 1961, is an Associate Professor in the Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Ladkrabang, Bangkok, Thailand. She was the President of Thai Institute of Chemical Engineering and Applied Chemistry (TIChE) from 2013 to 2017 and Chairperson of Chemical Engineering & Petrochemicals, the Engineering Institute of Thailand under H. M. The King’s Patronage from 2014 to 2019. Her field of expertise is chemical engineering, safety engineering, and catalysis
Prof. Dr.-Ing. Gobboon Lothongkum, born in 1960, is Professor and a member of the Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand. He served as Head of Department from 2015 to 2019. He received his Dr.-Ing. degree from the University of the Federal Armed Force Hamburg, Germany and the International Welding Engineer Certificate of the International Institute of Welding in 1994 and 2006, respectively. His areas of expertise include the corrosion of metals and alloys, welding and metal joining, stainless steel and high temperature materials.
Acknowledgement
This study was financially supported by the Chulalongkorn Academic Advancement into its 2nd Century project (CUAASC). The authors would like to thank the Posco Thainox and the Outokumpu companies for supplying stainless steel samples. Our sincere thanks are also extended to the Rushmore Precision Co., Ltd. for commercial image analysis software and the EPMA characterization assistance from the Thai Parkerizing Co., Ltd.
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