RESEARCH INVESTIGATION OF CORROSION-RESISTANT MATERIALS FOR ELECTROCHEMICAL CELLS.
Final rept. Jan 66-Jan 67.
TRW SYSTEMS REDONDO BEACH CALIF
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The compatibility of highly corrosion-resistant metals and alloys with molten salt and hot phosphoric acid electrolyte systems was studied. Probes suitable for use with the electrical-resistance method in molten salt electrolytes were developed. The probes made from 304 and 316 stainless steels were tested in KCl and KCl-NaCl at temperatures of 820 C and 700 C, respectively. The probes of 316 stainless steel showed fair reproducibility in corrosion rates when the probes were prepared and tested under similar conditions. The electrical-resistance method was found to be equally applicable for evaluating material compatibility in hot, concentrated phosphoric acid. The pure metals Ta, Ni, and W, as well as Ni- and W-based alloys, were investigated. Ta and Ta-10W alloy exhibited corrosion rates less than 1 mpy. Pure W and Hs alloys, W-25Re and 40Mo-30Re-30W, were also resistant to concentrated phosphoric acid with corrosion rates between 1 to 6 mpy. The results also indicated the potential gains that can be achieved by exploring a large number of alloy system and its composition range. The diffusion block concept of preparing a large number of alloy combinations in a systematic manner was thus conceived and tested. Author
- Non-electrical Energy Conversion
- Properties of Metals and Alloys