Corrosion failure analysis of 20# steel in the process of natural gas purification

Corrosion failure analysis of 20# steel in the process of natural gas purification The present work investigated the corrosion on 20# steel in the process of natural gas purification of PG gas field. According to the analyzing the corrosion condition of the desulfurization device, the research found that the main corrosion was caused by H2S/CO2 and there was also the obvious corrosive pitting caused by chloride ion. The morphology and composition of the corrosion scale were characterized by scanning electron microscopy, X-ray power diffraction, and energy-dispersive spectroscopy. Results showed that corrosion scale consists of FeS, Fe2S, and FeCO3. The weight loss experiment was conducted to estimate the actual corrosion rate of 20# steel. Electrochemical methods such as polarization curve and electrochemical impedance spectroscopy were used to analyze the effects of chloride ion concentration and temperature on the corrosion. It can be found that the corrosion rate increased with the increasing of chloride ion concentration and temperature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Corrosion failure analysis of 20# steel in the process of natural gas purification

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Publisher
Pleiades Publishing
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427215090207
Publisher site
See Article on Publisher Site

Abstract

The present work investigated the corrosion on 20# steel in the process of natural gas purification of PG gas field. According to the analyzing the corrosion condition of the desulfurization device, the research found that the main corrosion was caused by H2S/CO2 and there was also the obvious corrosive pitting caused by chloride ion. The morphology and composition of the corrosion scale were characterized by scanning electron microscopy, X-ray power diffraction, and energy-dispersive spectroscopy. Results showed that corrosion scale consists of FeS, Fe2S, and FeCO3. The weight loss experiment was conducted to estimate the actual corrosion rate of 20# steel. Electrochemical methods such as polarization curve and electrochemical impedance spectroscopy were used to analyze the effects of chloride ion concentration and temperature on the corrosion. It can be found that the corrosion rate increased with the increasing of chloride ion concentration and temperature.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Dec 23, 2015

References

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