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09344 Naphthenic Acid Corrosion: The Effect of Phosphorous and Non-Phosphorous Inhibitors on Carbon

Picture for 09344 Naphthenic Acid Corrosion: The Effect of Phosphorous and Non-Phosphorous Inhibitors on Carbon
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Product Number: 51300-09344-SG
ISBN: 09344 2009 CP
Author: Bradley G. Harrell, Corina L. Sandu, Ksenija Babic-Samardzija and Michael J. Zetlmeisl
Publication Date: 2009
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Naphthenic acids present in crude oils contribute to high-temperature corrosion. Corrosion caused by naphthenic acids generally occurs in the temperature range of 200-400 °C (400-750 °F). The use of inhibitors is a common corrosion mitigation strategy. Phosphorus based compounds are known to be effective in naphthenic acid corrosion control. However, some users have enforced limitations on phosphorous content, requiring application of phosphorus-free alternatives. In light of these restrictions, a systematic surface study of carbon steel surfaces treated with both phosphorous and non-phosphorus based corrosion inhibitors is proposed.

Surfaces of both treated and untreated carbon steel specimens were characterized via X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) spectroscopy. In addition, morphological data were obtained using Vertical Scanning Interferometry (VSI). Molecular modeling was used to correlate electronic properties of the inhibitors with their reactivity.

Keywords: naphthenic acid, corrosion inhibitor, carbon steel, XPS, VSI
Naphthenic acids present in crude oils contribute to high-temperature corrosion. Corrosion caused by naphthenic acids generally occurs in the temperature range of 200-400 °C (400-750 °F). The use of inhibitors is a common corrosion mitigation strategy. Phosphorus based compounds are known to be effective in naphthenic acid corrosion control. However, some users have enforced limitations on phosphorous content, requiring application of phosphorus-free alternatives. In light of these restrictions, a systematic surface study of carbon steel surfaces treated with both phosphorous and non-phosphorus based corrosion inhibitors is proposed.

Surfaces of both treated and untreated carbon steel specimens were characterized via X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) spectroscopy. In addition, morphological data were obtained using Vertical Scanning Interferometry (VSI). Molecular modeling was used to correlate electronic properties of the inhibitors with their reactivity.

Keywords: naphthenic acid, corrosion inhibitor, carbon steel, XPS, VSI
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