CO2 Top-of-the-Line Corrosion in Presence of Acetic Acid: A Parametric Study

This research presents the results of an experimental study, performed in a flow loop, of five parameters identified as having a significant influence on top-of-the-line corrosion (TLC): partial pressure of carbon dioxide (CO2). condensation rate, gas temperature, organic acid concentration, and gas...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2013-07, Vol.69 (7), p.719-735
Main Authors: SINGER, M, HINKSON, D, ZHANG, Z, WANG, H, NESIC, S
Format: Article
Language:English
Subjects:
Acetic acid
Acids
Applied sciences
Carbon dioxide
Carbonates
Condensation
Condensing
Corrosion
Corrosion effects
Corrosion environments
Corrosion rate
Corrosion tests
Droplets
Exact sciences and technology
Gas temperature
Gases
Iron carbonate
Localized corrosion
Metal surfaces
Metals
Metals. Metallurgy
Organic acids
Parameter identification
Parameters
Parametric statistics
Partial pressure
Pitting (corrosion)
Renewal
Uniform attack (corrosion)
Velocity
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Summary:This research presents the results of an experimental study, performed in a flow loop, of five parameters identified as having a significant influence on top-of-the-line corrosion (TLC): partial pressure of carbon dioxide (CO2). condensation rate, gas temperature, organic acid concentration, and gas velocity. A comprehensive analysis of the effect of each of these five parameters on the type of corrosion is performed. Experimental data related to uniform corrosion, pitting, and mesa attack are presented and provide an inclusive view of the phenomena involved in TLC in sweet environments. It is proposed that the relatively small volume of the droplet can become supersaturated with respect to iron carbonate (FeCO sub(3)), as a result of the initially high average corrosion rate. Depending on the conditions, the precipitation of FeCO sub(3) on the metal surface can decrease significantly the average corrosion rate. However, the protectiveness of this layer is challenged by the rate of droplet renewal (water condensation rate) and the overall corrosiuity of the environment (CO2 content, acetic acid concentration). Very aggressive localized corrosion can be initiated and sustained. The extent of TLC is definitively the result of complex interactions between all of these parameters. Threshold values, often used as engineering guidelines in the industry, should be used with caution, and a solid understanding of the mechanisms involved is a prerequisite for the development of effective TLC inhibition program.
ISSN:0010-9312
1938-159X
DOI:10.5006/0737