Presented at the 2023 Rio Pipelines Conference in Rio de Janeiro, Brazil.
The present work evaluates the API 5L X70 steel corrosion resistance of welded longitudinal joint samples taken from diﬀerent pipeline pipe manufacturers. The samples are evaluated using potentiodynamic polarization techniques, electrochemical impedance spectroscopy (EIS), as well as through localized testing using a microcell and the vibrating electrode scanning technique (SVET). The electrolyte used is iron ore beneﬁciation plant process water used for pipeline ﬂushing. Despite the similar alloy composition, the results show that the electrochemical behavior is diﬀerent for each sample, revealing that one of the alloys is susceptible to localized attack.
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