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A STUDY OF ACETIC ACID ROLE IN C02 CORROSION

Syed Sheikh, Syed Sadiq (2011) A STUDY OF ACETIC ACID ROLE IN C02 CORROSION. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

The presence of organic acids typically acetic acid (HAc) in reservoir is known to influence C02 corrosion. However, the mechanism of the higher concentration of HAc on C02 corrosion is still unclear. The role of higher concentration of HAc in C02 corrosion needs to be determined for accurate corrosivity prediction. The aim of the project is to understand the role of different concentrations of HAc on C02 corrosion. The role of HAc in C02 corrosion is investigated by using electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), scanning electron microscopy (SEM), and x-ray diffraction (XRD) techniques. All experiments were conducted in a 3% NaCl solution of pH 5.5 and temperature 60"C. In the absence of HAc, C02 corrosion produced iron carbonate film which comes from the reaction of iron ions and carbonate ions. At 1000 ppm and 2000 ppm HAc, a layer of iron acetate (FeAc) seems to form and solubilize continuously since the rate of formation ofFeAc is much higher than that ofFeC03• By adding 4000 ppm of HAc, the FeAc layer seems to grow due to the excessive amount of HAc and finally forming a layer on the steel surface, thus reducing the corrosion rate. This behavior is shown by the EIS curves for each concentrations of acetic acid. The formation of FeAc layer can be seen in the SEM micrographs and the presence ofFeAc is confirmed by using the XRD technique.

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Materials - Corrosion engineering - Corrosion of metals
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 31 Oct 2013 08:56
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/10123

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