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Study on Corrosion Inhibitor Efficiency for Carbon Steel in CO2 Corrosion

Wan Normimi Roslini Binti Abdullah, Wan Normimi Roslini (2009) Study on Corrosion Inhibitor Efficiency for Carbon Steel in CO2 Corrosion. Universiti Teknologi Petronas, Sri Iskandar,Tronoh,Perak. (Unpublished)

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Abstract

CO2 corrosion is the main threat in oil and gas industry. In order to reduce the corrosion of carbon steel pipelines in CO2 environment, inhibitors are added to control corrosion rate to an acceptable level. However, the successful of the corrosion inhibitor injection depends not only on the good inhibitor formulation used but also operational parameters such as temperature, pH and flow conditions. The objective of the project is to investigate the main operational parameters that influence the efficiency of the corrosion inhibitor for carbon steel in CO2 environment. Temperature and pH are varied from 250C to 800C and pH 5 and 6, respectively. The corrosion inhibitor used is AMTECH and dosage is set at 500 ppm. The test medium is 3% NaCl solution saturated with carbon dioxide gas at 1 bar. From the experiment, it is found that the efficiency of inhibitor increased when temperature increases from room temperature 250C to 800C. The highest efficiency of inhibitor is at temperature 800C with the value of 97.4% at pH 5. However, at pH 6, the inhibitor efficiency decreased when the temperature is increased. The efficiency of inhibitor for pH 6 at 800C is 46.2%. This is possibly due to the effect of the corrosion product film formation that protects the metal surface at pH higher than 5. Therefore, the inhibitor efficiency will decrease for higher pH 6. The recommendations are to do further testing to simulate the turbulence flow condition and to investigate the formation of corrosion product film at higher pH that affects the efficiency of the inhibitor.

Item Type: Final Year Project
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:24
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/687

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