SILVA, REJANE M.P.SUFFREDINI, HUGO B.BASTOS, IVAN N.SANTOS, LUIS F.SIMOES, ALDA M.P.2022-04-192022-04-192022SILVA, REJANE M.P.; SUFFREDINI, HUGO B.; BASTOS, IVAN N.; SANTOS, LUIS F.; SIMOES, ALDA M.P. Naphthenic acid corrosion of API 5L X70 steel in aqueous/oil environment using electrochemical surface-resolved and analytical techniques. <b>Electrochimica Acta</b>, v. 407, p. 1-12, 2022. DOI: <a href="https://dx.doi.org/10.1016/j.electacta.2022.139900">10.1016/j.electacta.2022.139900</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/32966.0013-4686http://repositorio.ipen.br/handle/123456789/32966Naphthenic acid corrosion of steel is studied in crude oil/aqueous phase system at ambient temperature, using a biphasic stagnant liquid without emulsification, by means of electrochemical measurements and surface analysis. The in-situ electrochemical impedance is assigned to the processes occurring at the aqueous phase. Corrosion occurred only in 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. The impedance values, normalized to the aqueous region only, reveal corrosion rate increasing with the ratio of crude oil/water. Despite the localized character of the anodic oxidation, the iron naphthenate corrosion products became partitioned between the two phases. Surface-resolved electrochemical techniques in aqueous solution revealed enhanced activity of the regions pre-exposed to oil.1-12openAccesshydroaromaticselectrochemistryimpedancecorrosionArtigo de periódico40710.1016/j.electacta.2022.1399007590