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Corrosion tests have been conducted to determine the compatibility of gallium with candidate structural materials for the International Thermonuclear Experimental Reactor (ITER) first wall/blanket systems, e.g., Type 316 stainless steel (SS), Inconel 625, and Nb-5 Mo-1 Zr. The results indicate that Type 316 SS is least resistant to corrosion in static gallium and Nb-5 Mo-1 Zr alloy is most resistant. At 400/spl deg/C, corrosion rates for Type 316 SS, Inconel 625, and Nb-5 Mo-1 Zr alloy are /spl ap/4.0, 0.5, and 0.03 mm/yr, respectively. Iron, nickel, and chromium react rapidly with gallium. Iron shows greater corrosion than nickel at 400/spl deg/C (/spl ges/88 and 18 mm/yr, respectively). The present study indicates that at temperatures up to 400/spl deg/C, corrosion occurs primarily by dissolution and is accompanied by formation of metal/gallium intermetallic compounds. The growth of intermetallic compounds may control the overall rate of corrosion.
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Luebbers et al. (2002) studied this question.