Abstract
In this paper, preliminary studies of ten different plant extracts as potential corrosion inhibitors of carbon steel were examined. For each extract, the concentration range in which it shows anti-corrosion action was first determined, and then the most effective concentration was determined for each extract. The tests were performed in a brine solution saturated with CO2 at room temperature. The aim of this study was to isolate extracts with high effectiveness and subsequent electrochemical and surface methods to determine the mechanism of inhibitory action. For this purpose, potentiodynamic polarization was performed with Tafel extrapolation. Among all the tested extracts, lady’s mantle (92.17%) and dandelion root (95.07%) stood out with their effectiveness. Both tested extracts showed the behaviour of a mixed corrosion inhibitor with a dominant influence on the anode process.
Highlights
The petroleum industry has been facing the problem of corrosion since most of the equipment and pipelines in the petroleum industry are made of carbon steel
Hydrocarbon production, depending on the type of the reservoir, implies the production of a certain amount of brine and other impurities
The steel most sensitive to corrosion is low carbon steel, which is mostly used in the petroleum industry
Summary
The petroleum industry has been facing the problem of corrosion since most of the equipment and pipelines in the petroleum industry are made of carbon steel. Through the process of oil and gas production, gathering, treatment and transportation, most of the process equipment and pipelines are made of carbon steel. The produced fluid can contain, among other things, carbon dioxide (CO2) and hydrogen sulphide (H2S), which, dissolved in water (brine) cause corrosion and damage to the equipment. The steel most sensitive to corrosion is low carbon steel, which is mostly used in the petroleum industry. The consequences of corrosion in the petroleum industry could affect the environment (potential cause of a fluid spill) and due to equipment damage, but environ-
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