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A STUDY OF ACETIC ACID ROLE IN C02 CORROSION

Mastuki, Nabilah (2011) A STUDY OF ACETIC ACID ROLE IN C02 CORROSION. Universiti Teknologi Petronas. (Unpublished)

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Abstract

In order to understand and determine the mechanism and corrosion reaction of C02 ~orrosion in presence of acetic acid, HAc studies and experiments about the matter has been ione. This report will document all information and data collected from experiments done throughout the project. In major oilfield, C02 corrosion is considered as major problems that cost million of dollars to the industry. C02 corrosion caused by carbonic acid that formed when C02 gas dissolved in the water or brine that accompanies oil production at high pressures common in ~nderground oil and gas reservoirs. Usually, COz corrosion problems are manageable and under ~ontrol. However, when small amount of organic acid that dominated by acetic acid is present in the system, the corrosion rate changes drastically. In this project, Electrochemical Impedance Spectroscopy ( EIS ) and Linear Polarization Resistance ( LPR ) was the measurement technique that being used in the project. EIS is a technique employed to study the mechanisme of C02 corrosion in presence of acetic acid, while LPR is a technique to determine the corrosion rate. All experiments were conducted in a 3% NaCl solution of pH 5.5 and temperature 60°C.Based from results that was gathered from the experiment, LPR shows that corrosion rate for lOOOppm and 2000ppm of acetic acid increased significantly compared to blank C02. Meanwhile for 4000ppm, the corrosion rate decreased. This phenomenon was due to excessive non ionized acetic acid HAc. The carbonate ions from the iron carbonate could not dissolve the excessive amount of acetate leaving the iron ions to reacts with it and form iron acetate. Formation of FeC03 that decrease the corrosion rate can be proven from the trend of the data collection that shows significant decrease with time. It is correct to claim that in presence of acetic acid, the corrosion rate could increase significantly.

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Materials - Corrosion engineering - Degradation of materials due to temperature, stress and environment
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 26 Sep 2013 12:59
Last Modified: 25 Jan 2017 09:41
URI: http://utpedia.utp.edu.my/id/eprint/6804

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