Inhibition of Mild Steel Corrosion in Acid Medium
Since inhibition is the simplest mechanism used for mitigating the corrosion of metals and alloys, particularly in acidic environments, the present work aims to investigate the inhibiting effect of N-benzyl-N?-phenyl thiourea (BPTU) and N-cyclohexyl-N?-phenyl thiourea (CPTU) on mild steel corros...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2017-10-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | http://ijtech.eng.ui.ac.id/article/view/873 |
| _version_ | 1797969544432582656 |
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| author | S. Divakara Shetty Nagaraja Shetty |
| author_facet | S. Divakara Shetty Nagaraja Shetty |
| author_sort | S. Divakara Shetty |
| collection | DOAJ |
| description | Since inhibition is the simplest
mechanism used for mitigating the corrosion of metals and alloys, particularly
in acidic environments, the present work aims to investigate the inhibiting effect
of N-benzyl-N?-phenyl thiourea (BPTU) and N-cyclohexyl-N?-phenyl thiourea
(CPTU) on mild steel corrosion in 0.1M HCl medium using the Tafel extrapolation
technique. Tafel experiments were conducted with ±250 mV vs. rest potential
(RP) in steps of 20 mV from the cathodic side for recording the corrosion
currents, and then, the Tafel plot of potential vs. current was drawn for
determining the corrosion current density (icorr). The linear
polarization method was also used for validating the Tafel results. It was
performed by polarizing the specimen with ±20 mV vs. RP in steps of 5 mV, and
the corrosion currents were noted. The plot of potential vs. current was drawn
for calculating icorr. The study reveals that both BPTU and CPTU act
as anodic inhibitors for mild steel in the HCl medium, and good inhibition
efficiency (>97%) was evidenced from both the compounds even at elevated
temperatures. The study also reveals that the investigated compounds get
adsorbed quickly on the steel surface, following Temkin’s adsorption isotherm.
The kinetic parameters obtained from the study indicated that the inhibition
was governed by a chemisorption mechanism and the presence of inhibitors
substantially reduced the metal dissolution in the studied temperature range.
The investigation shows that there was a good correlation between the Tafel
extrapolation and linear polarization results. |
| first_indexed | 2024-04-11T03:03:53Z |
| format | Article |
| id | doaj.art-60dc5706e1e34df1bcd1f4d761405ada |
| institution | Directory Open Access Journal |
| issn | 2086-9614 2087-2100 |
| language | English |
| last_indexed | 2024-04-11T03:03:53Z |
| publishDate | 2017-10-01 |
| publisher | Universitas Indonesia |
| record_format | Article |
| series | International Journal of Technology |
| spelling | doaj.art-60dc5706e1e34df1bcd1f4d761405ada2023-01-02T13:38:12ZengUniversitas IndonesiaInternational Journal of Technology2086-96142087-21002017-10-018590991910.14716/ijtech.v8i5.873873Inhibition of Mild Steel Corrosion in Acid MediumS. Divakara Shetty0Nagaraja Shetty1Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal-576 104, Karnataka, IndiaDepartment of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal-576 104, Karnataka, IndiaSince inhibition is the simplest mechanism used for mitigating the corrosion of metals and alloys, particularly in acidic environments, the present work aims to investigate the inhibiting effect of N-benzyl-N?-phenyl thiourea (BPTU) and N-cyclohexyl-N?-phenyl thiourea (CPTU) on mild steel corrosion in 0.1M HCl medium using the Tafel extrapolation technique. Tafel experiments were conducted with ±250 mV vs. rest potential (RP) in steps of 20 mV from the cathodic side for recording the corrosion currents, and then, the Tafel plot of potential vs. current was drawn for determining the corrosion current density (icorr). The linear polarization method was also used for validating the Tafel results. It was performed by polarizing the specimen with ±20 mV vs. RP in steps of 5 mV, and the corrosion currents were noted. The plot of potential vs. current was drawn for calculating icorr. The study reveals that both BPTU and CPTU act as anodic inhibitors for mild steel in the HCl medium, and good inhibition efficiency (>97%) was evidenced from both the compounds even at elevated temperatures. The study also reveals that the investigated compounds get adsorbed quickly on the steel surface, following Temkin’s adsorption isotherm. The kinetic parameters obtained from the study indicated that the inhibition was governed by a chemisorption mechanism and the presence of inhibitors substantially reduced the metal dissolution in the studied temperature range. The investigation shows that there was a good correlation between the Tafel extrapolation and linear polarization results.http://ijtech.eng.ui.ac.id/article/view/873Acid picklingActivation energyHydrochloric acidInhibition of mild steel corrosionPolarization |
| spellingShingle | S. Divakara Shetty Nagaraja Shetty Inhibition of Mild Steel Corrosion in Acid Medium International Journal of Technology Acid pickling Activation energy Hydrochloric acid Inhibition of mild steel corrosion Polarization |
| title | Inhibition of Mild Steel Corrosion in Acid Medium |
| title_full | Inhibition of Mild Steel Corrosion in Acid Medium |
| title_fullStr | Inhibition of Mild Steel Corrosion in Acid Medium |
| title_full_unstemmed | Inhibition of Mild Steel Corrosion in Acid Medium |
| title_short | Inhibition of Mild Steel Corrosion in Acid Medium |
| title_sort | inhibition of mild steel corrosion in acid medium |
| topic | Acid pickling Activation energy Hydrochloric acid Inhibition of mild steel corrosion Polarization |
| url | http://ijtech.eng.ui.ac.id/article/view/873 |
| work_keys_str_mv | AT sdivakarashetty inhibitionofmildsteelcorrosioninacidmedium AT nagarajashetty inhibitionofmildsteelcorrosioninacidmedium |