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Corrosion Protection in Fuel Cells

#1273


Development of Method for Anticorrosive Metal Structure Protection of Molten Carbonate Fuel Cell Batteries

Tech Area / Field

  • BIO-IND/Industrial Biotechnology/Biotechnology
  • BIO-REM/Bioremediation/Biotechnology

Status
8 Project completed

Registration date
20.05.1998

Completion date
09.10.2003

Senior Project Manager
Rudneva V Ya

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • TU Delft, The Netherlands, Delft

Project summary

In the Russian Federal Nuclear Center (RFNC-VNIIEF) the works on noncorrosive metal part protection have being performed for a long time.

The task of the Project is to develop method for noncorrosive fuel cell structure protection of melt carbonate fuel cell batteries for electrochemical generators on the base of available technological processes. Project results will permit to increase resource of work for pilot samples of environmentally conscious electrochemical generators with melt carbonate fuel cell batteries from one hundred hours to years. Successful solution of the problems, stated in the Project, will allow promoting production of industrial electrochemical generator samples in Russia, to launch a commercial production of them for needs of national economy. Stainless fire-proof steels of 12H18N10T (Russia) и SUS 310, SUS 316 (USA) types are used for production of metal structures for pilot samples of melt carbonate fuel cell batteries. But resistance of even such steels is rather low (about some hundreds of hours) in alkaline metal carbonate melts, in conditions of heated H2, O2, CO2, CO reactant gases up to 650 - 700° C and of overheated water vapor. To increase noncorrosive resistance of metal parts for RKTE batteries to some thousands hours, firms of Russia and USA use coatings of Al, Ni, Cr and of complex metal oxides. Methods of coverings and strengthening of such coating methods are different. There are the following coating methods:


- gas-flame;
- thermodiffusional in powders;
- emulsion with further thermal treatment;
- dipping into the salt melt.

To achieve Project goals, it is necessary to study a number of materials and methods of its coating to BRKTE parts, and to determine the following:


- thickness of a just coating;
- thickness of interfacial layer;
- coating porisity;
- mechanical characteristics of the base material and of the coating;
- structure and phase coating composition;
- coating influence on weldability and stampability of BRKTE parts;
- corrosive resistance of the base material with coating in long-duration (about 1000 hours) testing, first, of the samples and then of full-scale BRKTE parts in operating conditions, exactly: in exposure to carbonate (Li and K) melts, heated gas-reactants (H2, CO2, H2O, и O2, CO, CO2) and using external load source (polarization);
- analysis of mathematical model of coated material in electrochemical exposure to aggressive mediums within the BRKTE.

During the work collaboration with foreign firms is proposed in the following forms:


- information exchange;
- possible performance of joint investigation;
- possible joint commercial use of investigation results.


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