Evaluation of N,N-Dimethylformamide as Corrosion Inhibitor on API 5L X70 using 3% NaCl
- PDF / 1,526,318 Bytes
- 9 Pages / 432 x 648 pts Page_size
- 98 Downloads / 214 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.314
Evaluation of N,N-Dimethylformamide as Corrosion Inhibitor on API 5L X70 using 3% NaCl Pablo Martínez Jiménez1, Araceli Espinoza Vázquez1, Francisco Javier Rodríguez Gómez1 1
Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, 04510, México
Corresponding author: [email protected]
Abstract
Dimethylformamide (DMF) has been tested as corrosion inhibitor in a metallic material like API 5LX70 in a corrosive solution of 3% of NaCl and using electrochemical technique as electrochemical impedance spectroscopy. The results showed that 20 ppm is the best concentration to protect the metallic surface of API 5L X70 with η~ 94%. Hydrodynamic conditions (100 and 1000 rpm) demonstrated that the DMF at different concentration afforded moderate protection against corrosion with inhibition efficiency ~70%. Finally, the adsorption of this compound follows the Langmuir isotherm with a chemisorptionphysisorption process.
1 INTRODUCTION The oil industry has presented grave problems mainly on gasoducts and oleoducts caused by the corrosive species as chloride ion (Cl -1), together with other, due to the industrial cleansing to which the ducts are submitted [1-5]. Several techniques can be found to solve this corrosion problem, like the use of organic inhibitors, as it is an affordable way to diminish the matter [6-10]. In literature, there are extensive studies on corrosion inhibitors in a saline medium. As a consequence, the intense search for compounds that work to diminish this problem in such media has carried on. The capacity to decrease corrosion wells in the fact that these compounds are adsorbed on the metallic surface. Furthermore, transport pipes contain fluids in constant motion. The fluid movement in inside a pipe generates an interior wall shear stress, which may affect the
Downloaded from https://www.cambridge.org/core. Columbia University - Law Library, on 18 Aug 2019 at 03:52:43, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.314
inhibitor film formed over the metal. Additionally, the flow regime, most commonly present in hydrocarbon transport pipes, is turbulent. However, limited scientific or technical data are available regarding the persistence of an inhibitor film on a metallic surface in contact with a moving fluid [11-13]. Dimethylformamide (DMF) is a colorless to slightly yellow liquid (Figure 1). DMF has low volatility and can be miscible with water and the majority of organic liquids, and thus is used in a wide variety of industrial applications [15, 16]. This compound shown other application for example: the ligands of metal catalysts, reducing agents [17]. Some of the organic compounds that have been evaluated as corrosion inhibitors are dissolved in organic solvents as N, N-dimethylformamide (DMF), due this, its electrochemical characterization in different hydrodynamics conditi
Data Loading...
