“…In a similar study of three phases including the practically obsolete γ 2 ‐phase in an aqueous solution of 0.9 wt% NaCl using only impedance, open circuit, and polarization measurements, the observed corrosion resistance was found to be associated with the formation of a corrosion layer. [ 41 ] In a very similar study, a rating of corrosion stability of the phases was suggested, with the γ 2 ‐phase being most corrosion prone. [ 42 ] Except for data pertaining to the Ag–Cu alloy, the same results have been reported elsewhere.…”