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Effect Of Hydrophobic Interaction On Corrosion Inhibitor Efficiency

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Corrosion inhibitors are used to prevent pipeline corrosion in oil and gas industry. The evaluation of corrosion inhibitors is one of the most important tasks for the corrosion engineers. Corrosion of the metal is suppressed by the inhibitor adsorption on the metal surface. Active ingredients of corrosion inhibitors are, in general, surfactants. A surfactant can adsorb on the internal metal surface of piping and makes a hydrophobic film preventing the contact of water with the metal surface.

Product Number: 51322-17597-SG
Author: Susumu Hirano, Ayano Yasui, Hirotaka Mizukami, Tatsuya Sei, Toshiyuki Sunaba
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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Surfactants are well known as an active ingredient of corrosion inhibitors; however, the molecular structure and its content of commercial inhibitors are not disclosed to users. The performance of commercial inhibitors was studied by treating the whole aspect of inhibitor as a kind of surfactant. The corrosion rate was measured with an autoclave by using an electrochemical measurement; namely, linear polarization resistance (LPR) in an oil flowline condition solution. Firstly, the corrosion rate was measured only with a corrosion inhibitor, and a hydrocarbon solvent was added afterwards. The decrease of the corrosion rate was observed after an addition of the solvent. Aliphatic, alicyclic and aromatic solvents with different octanol-water partition coefficients, KOW, were tested in the same manner. The inhibitor efficiency was saturated remarkably after the addition of a solvent with high KOW. The synergistic effect with a specific solvent in this test can characterize the hydrophobicity and the adsorption tendency of the commercial inhibitor without close chemical analysis to specify the surfactant in it.

Surfactants are well known as an active ingredient of corrosion inhibitors; however, the molecular structure and its content of commercial inhibitors are not disclosed to users. The performance of commercial inhibitors was studied by treating the whole aspect of inhibitor as a kind of surfactant. The corrosion rate was measured with an autoclave by using an electrochemical measurement; namely, linear polarization resistance (LPR) in an oil flowline condition solution. Firstly, the corrosion rate was measured only with a corrosion inhibitor, and a hydrocarbon solvent was added afterwards. The decrease of the corrosion rate was observed after an addition of the solvent. Aliphatic, alicyclic and aromatic solvents with different octanol-water partition coefficients, KOW, were tested in the same manner. The inhibitor efficiency was saturated remarkably after the addition of a solvent with high KOW. The synergistic effect with a specific solvent in this test can characterize the hydrophobicity and the adsorption tendency of the commercial inhibitor without close chemical analysis to specify the surfactant in it.

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Dual Functional Corrosion Inhibitor Design And Testing For Top-Of-Line And Bottom Of Line Corrosion

Product Number: 51322-17787-SG
Author: Larry Chen, Nihal Obeyesekere, Jonathan Wylde, Michael Sim
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TOL corrosion is reported to occur in large diameter wet gas pipeline in stratified flow conditions
due to low fluid velocities1. With increasing distance from the inlet, the wet gas pipeline becomes
cooler as it loses heat to the environment. Such cooling causes water, hydrocarbon, and other
high vapor pressure species to condense on the pipe wall. The upper part of the pipe will
constantly be supplied with freshly condensed water while the less corrosive water saturated
with corrosion products will be drained along the pipe wall to the bottom of the line.
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Effect Of Inhibitor Component On Inhibitor Efficiency - Inhibitor Types And Intensifier-

Product Number: 51322-17791-SG
Author: Hirotaka Mizukami, Ayano Yasui, Tatsuya Sei, Takashi Ito, Susumu Hirano, Toshiyuki Sunaba, Akiyoshi Kimura, Reiko Ikeda, Mitsuru Uno
Publication Date: 2022
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A lot of oil and gas facilities face corrosion problems because the production fluid contains some corrosive components represented by CO2. Generally, corrosion inhibitors are used in order to mitigate corrosion problems of tubing and pipeline. Imidazoline is known as one of the active ingredients of corrosion inhibitors and widely used in the oil and gas industries. However, imidazoline-type inhibitor is easily hydrolyzed to amide if water mixes into it.
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Corrosion Inhibitor Encapsulation For Enhanced Chemical Efficiency And Performance

Product Number: 51322-17548-SG
Author: Fang Cao, James Oxley, Yao Xiong, Satish Bodige, Dennis Schmatz
Publication Date: 2022
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Corrosion of pipelines made of carbon steel and exposed to wet hydrocarbons containing CO2 and H2S is a common but serious problem encountered in petroleum industry and its occurrence causes enormousexpense due to production downtime, accidental injuries, and replacement costs. Control and prevent corrosion using chemical treatment (e.g. corrosion inhibitor injection) is one of the most cost-effective solutions and commonly practiced methods to prevent corrosion failures in pipelines in oil and gas industry. Generally speaking, the active corrosion inhibitor (CI) components in commercial CI packages are usually organic, nitrogen-based surfactants such as amines, imidazoline and its derivatives. Due to the amphiphilic nature of surfactants, a good fraction of the injected CI will inevitably go into the oil phase through partitioning and to the oil/water interface.
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