51313-02453-Multipronged Characterization of the Corr. Product Layer on Mild Steel after Exposure to Acetic Acid

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Product Number: 51313-02453-SG

ISBN: 02453 2013 CP

Author: Vanessa Fajardo

Publication Date: 2013

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Organic acids can be present in produced fluids in oil and gas production systems. The most commonly encountered species is acetic acid which has been hypothesized to damage the protective iron carbonate layer formed on mild steel in sweet corrosion environments. In laboratory experiments such an exposure was shown to lead to a temporary increase in the corrosion rate. However the final corrosion rate seems to be unaffected. A key objective of this research was to determine how the visually porous iron carbonate layer that survives the attack of acetic acid continues to protect the underlying mild steel. This raises the possibility that there may be a different phase on the steel surface conferring protection which has heretofore been undetected. This research sought to identify this phase by characterizing the corrosion product layer using several analytical techniques (SEM EDS FIB/TEM/ED XRD and XPS). This multipronged approach provided a more complete picture of the species found on the steel surface to confirm that the presence of acetic acid at a constant pH partially removed the iron carbonate layer. However the protection persisted as FeCO3 appeared to remain on the surface as a thin surface layer of intergrown nanocrystals.