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Raman spectroscopy and electrochemical techniques were used to characterize the interactions of aqueous NaVO 3 /NaCl and NH 4 VO 3 /oxalic acid with AA 2024-T3. The interaction of aqueous NaVO 3 with Cu 0 and Cu 2 O was characterized. At potential values similar to the OCP of AA 2024-T3 in dilute NaCl, aqueous NaVO 3 formed a polyvanadate film on Cu 2 O and formed little or no vanadate film on Cu 0 . Treatment of AA 2024-T3 with basic, aqueous NaVO 3 /NaCl resulted in a polyvanadate film on copper-rich intermetallic particles and the formation of monovanadates on the matrix. Treatment of AA 2024-T3 with acidic, aqueous NH 4 VO 3 /oxalic resulted in the formation of monovanadates on the matrix and provided no evidence of vanadate species on copper-rich particles. AA 2024-T3 samples pretreated with either aqueous vanadate salt solution displayed modest cathodic inhibition soon after treatment but inhibition degraded with aging. The formation of polymerized vanadates species on copper-rich particles supports the cathodic inhibition mechanism. The presence of vanadate species on copper-rich particles pretreated with aqueous NaVO 3 /NaCl containing predominantly tetrahedral vanadates versus the lack of evidence for similar species on particles treated with aqueous NH 4 VO 3 /oxalic acid containing predominantly octahedral vanadates supports the importance of tetrahedrally coordinated vanadate species for corrosion inhibition.
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Hurley et al. (2011) studied this question.
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