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The corrosion of a Cu-15 vol.% Nb alloy byH2-H2S mixtures has been studiedunder 10-12 atm S2 at 400 and500°C and under 10-10 atm S2at 500 and 600°C. The alloy is a two-phase mixtureof the two terminal solid solutions and is composed of a Cu-richmatrix containing particles of the Nb-rich phaseelongated parallel to the sample surface and isolatedmainly from each other. The alloy corroded at ratessimilar to those of pure copper at 400 and 500°Cunder 10-12 atm S2, but moreslowly than pure copper at 500 and 600°C under10-10 atm S2. The scales wereduplex, containing an external layer of pure coppersulfide and an inner very porous region composed of amixture of sulfides of the two metals in which, however,the core of the large Nb particles was stilluncorroded. |
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