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- Naphthenic corrosion using electrochemical and analytical techniquesPublication . Simões, Alda Maria Pereira; Pereira Da Silva, Rejane Maria; Suffredini, Hugo; Santos, Luis; Bastos, Ivan NapoleãoABSTRACT: Naphthenic acid corrosion of steel was studied in a stagnant, biphasic oil/aqueous phase system, by means of electrochemical measurements and surface analysis. Corrosion was restricted to the region of the aqueous phase, as crater-shaped pits that eventually coalesced, generating a nearly uniform attack in the vicinity of the oil phase. In-situ electrochemical impedance spectroscopy (EIS) reveals the processes occurring at the aqueous phase, which nevertheless increase with the fraction of oil phase and with degree of acidity of the oil.