日本金属学会誌

J. Japan Inst. Metals, Vol. 65, No. 1 (2001),
pp. 45-52

Corrosion Behavior of Coated and Uncoated Stainless-Steel Separators at the Cathode Side in Molten Carbonate Fuel Cells

Hyeoung-Ho Park1, Min-Ho Lee2, Shoji Goto3, Setsuo Aso3 and Yoshinari Komatsu3

1Department of Metallurgical Engineering, Chonbuk National University, Chonju 561-756, Korea
2Department of Iron and Metallurgical Engineering, Kawngyang College, Kawngyang 545-800, Korea

3Department of Materials Science and Engeneering, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502

Abstract:

In order to evaluate the corrosion resistance of a cathode-side separator for a molten carbonate fuel cell (MCFC), SUS316 and SACC-SUS316, in which chromium and aluminum were simultaneously deposited by diffusion into a SUS316 austenitic stainless-steel substrate by a pack-cementation process, were used as separator materials. In the case of SUS316, corrosion proceeds via three steps: formation of a corrosion product until the corrosion product becomes stable, protection against corrosion until breakaway occurs and the advance of corrosion after breakaway. Because SUS316 exhibited a rapid corrosion rate in the cathode environment, it would be impossible to use this separator without suitable surface modification due to the occurrence of a severe problem involving the stability of the cell during long-time operation. In contrast, SACC-SUS316 was demonstrated to exhibit more effective corrosion resistance than the present separator, SUS316. In particular, there was no corrosion behavior exhibited by SACC-SUS316 after 480 h at 923 K. Moreover, it is considered that this will be very useful as an alternative separator at the cathode side in MCFCs in the future.


(Received September 18, 2000)

Keywords:

separator, molten carbonate fuel cell, corrosion rate, SUS316 austenitic stainless steel, coating


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.