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19-02-2019 | Issue 3/2019

Journal of Materials Engineering and Performance 3/2019

Effects of Chloride and Carbonate on Corrosion of API-X100 Pipeline Steel

Journal:
Journal of Materials Engineering and Performance > Issue 3/2019
Authors:
Faysal Fayez Eliyan, Hatem M. Alsyouri
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Abstract

Effects of chloride, introduced with 0.03, 0.05, 0.10, 0.12, 0.22, 0.25 M, on the corrosion behavior of API-X100 pipeline steel in 0.15 M carbonate solutions were studied. The evaluations were carried out with monitoring the open-circuit potentials and electrochemical impedance spectroscopy (EIS). The open-circuit potentials gave an electrochemical evidence on the weakening opposite kinetics of the passive film formation to the kinetics of dissolution with higher chloride concentrations. The open-circuit potentials were less with higher chloride concentrations. The EIS tests indicated that the corrosion resistance decreased, and species diffusion increased with the chloride concentration, in multi-time constant interactions. In all tests, slippery transparent films formed with no presence of pitting on the sample surfaces.

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