The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative
This paper studies the corrosion inhibition of Al-Mg alloy system in 0.5 mol/dm3 NaCl solution in the presence of pyrazole derivative using potentiodynamic polarization and linear polarization method. The inhibition efficiency as a function of concentration and temperature was investigated. From the...
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| Format: | Article |
| Language: | English |
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Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
2019-04-01
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| Series: | Iranian Journal of Chemistry & Chemical Engineering |
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| Online Access: | http://www.ijcce.ac.ir/article_30659_9429168574caf2c84c846055ffe67e7c.pdf |
| _version_ | 1811293849622937600 |
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| author | Veselinka Grudic Ivana Boskovic Dragan Radonjic Zeljko Jacimovic Bojana Knezevic |
| author_facet | Veselinka Grudic Ivana Boskovic Dragan Radonjic Zeljko Jacimovic Bojana Knezevic |
| author_sort | Veselinka Grudic |
| collection | DOAJ |
| description | This paper studies the corrosion inhibition of Al-Mg alloy system in 0.5 mol/dm3 NaCl solution in the presence of pyrazole derivative using potentiodynamic polarization and linear polarization method. The inhibition efficiency as a function of concentration and temperature was investigated. From the polarization curves, it can be concluded that the pyrazole derivative behaves like a mixed inhibitor. It has been shown that the efficiency of the inhibitor increases with increasing concentration and with increasing temperature and it indicates a chemisorption process. It was concluded that the pyrazole derivative adsorbed on the electrode blocks the active surface sites and reduces the corrosion rate. The kinetic and thermodynamic parameters of the adsorption process were determined. The relatively low efficiency of the inhibitor at room temperature could be an indicator of increased desorption in the adsorption-desorption equilibrium process. With increasing temperature the equilibrium is shifted in the direction of adsorption, causing an increasing inefficiency. Also, the positive values of equilibrium adsorption constant Kads indicate chemisorption of the pyrazole derivative on the alloy surface. The values of the activation energy in the presence of inhibitor were lower than in the uninhibited solution, which also indicates the chemical adsorption. Negative values of adsorption free energy ΔGads show that the adsorption process is spontaneous. |
| first_indexed | 2024-04-13T05:07:39Z |
| format | Article |
| id | doaj.art-dcd432d2a4ee41efa518e16cbb049797 |
| institution | Directory Open Access Journal |
| issn | 1021-9986 1021-9986 |
| language | English |
| last_indexed | 2024-04-13T05:07:39Z |
| publishDate | 2019-04-01 |
| publisher | Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR |
| record_format | Article |
| series | Iranian Journal of Chemistry & Chemical Engineering |
| spelling | doaj.art-dcd432d2a4ee41efa518e16cbb0497972022-12-22T03:01:07ZengIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry & Chemical Engineering1021-99861021-99862019-04-0138212713830659The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole DerivativeVeselinka Grudic0Ivana Boskovic1Dragan Radonjic2Zeljko Jacimovic3Bojana Knezevic4Faculty of Metallurgy and Technology, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, MONTENEGROFaculty of Metallurgy and Technology, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, MONTENEGROFaculty of Metallurgy and Technology, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, MONTENEGROFaculty of Metallurgy and Technology, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, MONTENEGROFaculty of Metallurgy and Technology, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, MONTENEGROThis paper studies the corrosion inhibition of Al-Mg alloy system in 0.5 mol/dm3 NaCl solution in the presence of pyrazole derivative using potentiodynamic polarization and linear polarization method. The inhibition efficiency as a function of concentration and temperature was investigated. From the polarization curves, it can be concluded that the pyrazole derivative behaves like a mixed inhibitor. It has been shown that the efficiency of the inhibitor increases with increasing concentration and with increasing temperature and it indicates a chemisorption process. It was concluded that the pyrazole derivative adsorbed on the electrode blocks the active surface sites and reduces the corrosion rate. The kinetic and thermodynamic parameters of the adsorption process were determined. The relatively low efficiency of the inhibitor at room temperature could be an indicator of increased desorption in the adsorption-desorption equilibrium process. With increasing temperature the equilibrium is shifted in the direction of adsorption, causing an increasing inefficiency. Also, the positive values of equilibrium adsorption constant Kads indicate chemisorption of the pyrazole derivative on the alloy surface. The values of the activation energy in the presence of inhibitor were lower than in the uninhibited solution, which also indicates the chemical adsorption. Negative values of adsorption free energy ΔGads show that the adsorption process is spontaneous.http://www.ijcce.ac.ir/article_30659_9429168574caf2c84c846055ffe67e7c.pdfcorrosion ratepyrazole derivativeinhibition efficiencyadsorption isotherms |
| spellingShingle | Veselinka Grudic Ivana Boskovic Dragan Radonjic Zeljko Jacimovic Bojana Knezevic The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative Iranian Journal of Chemistry & Chemical Engineering corrosion rate pyrazole derivative inhibition efficiency adsorption isotherms |
| title | The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative |
| title_full | The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative |
| title_fullStr | The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative |
| title_full_unstemmed | The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative |
| title_short | The Electrochemical Behavior of Al Alloys in NaCl Solution in the Presence of Pyrazole Derivative |
| title_sort | electrochemical behavior of al alloys in nacl solution in the presence of pyrazole derivative |
| topic | corrosion rate pyrazole derivative inhibition efficiency adsorption isotherms |
| url | http://www.ijcce.ac.ir/article_30659_9429168574caf2c84c846055ffe67e7c.pdf |
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