Alloy Corrosion

摘要

Figure 3 shows a parting limit, order- alloying threshold, at the alloy com- position Ag_0.6 Au_0.4; that is, for alloys containing less than 60 at. /100 Ag, macro- scopic de-alloying does not occur. In face-centered-cubic (fcc) solids, the site- percolation threshold occurs at approxi- mately 20 at./100 Ag, and so a natural question to consider is, "Why is Ag inac- cessible to the electrolyte in the interven- ing composition to consider is, "Why is Ag inac- cessible to the electrolyte in the interven- ing composition range?" One explanation for this is that in the composition range 20-60 at./100 Ag, the channels that open are too narrow to permit penetration of the electrolyte.