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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.19 [2012] >
IJCT Vol.19(3) [May 2012] >
| Title: | Anisidine isomers as corrosion inhibitor for oil well casing steel in hydrochloric acid |
| Authors: | Haldar, N
Shukla, H S
Udayabhanu, G |
| Keywords: | Anisidine isomers
Corrosion inhibitor
Inhibitor product
N80 steel
Temkin isotherm |
| Issue Date: | May-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The present study deals with the evaluation of effectiveness of the ortho
anisidine (OAD), meta anisidine (MAD) and para anisidine (PAD) as corrosion
inhibitors for N80 steel in 15% HCl solution by weight loss method and
potentiodynamic polarization method. The protective ability of the compounds
has been verified at different temperatures (303 - 383 K) and exposure periods
(6 - 24 h). PAD shows maximum inhibition (88.3%). Potentiodynamic polarization
studies reveal that the tested inhibitors act as mixed type inhibitor; OAD and
PAD act preferentially on cathodic areas and MAD preferentially on anodic
areas. The red shift of N-H and C-O bond frequencies of the metal surface
products after the 6 h immersion test indicate the donation of electron pair
through N atom and involvement of phenyl ring into the surface adsorption. SEM
study reveals formation of semi globular inhibitor products on the metal
surface. The comparison of the protection efficiencies of these isomers
according to their relative electron density on the reaction centre and
projected molecular area of the inhibitor molecules have also been done. An
adsorption model of the inhibitor molecules on the metal surface on the basis
of Tafel parameters, thermodynamic parameters and infrared spectra has been
proposed. |
| Page(s): | 173-179 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.19(3) [May 2012]
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