NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.14 [2007] >
IJCT Vol.14(4) [July 2007] >


Title: Corrosion inhibition of stainless steel 347 in the mixture of phosphoric and acetic acid using phosphorus ylide compound
Authors: Hosseini, S M A
Quanbari, M
Salari, M
Keywords: Corrosion inhibitor
Polarization behaviour
L-OH
Isotherm
Issue Date: Jul-2007
Publisher: CSIR
IPC CodeC23F11/00
Abstract: Cathodic and anodic polarization behaviour of SS₃₄₇ in mixture of highly concentrated phosphoric and acetic acid in the presence of various amounts of dimethyl 2-(2-hydroxyphenyl amino)-3-(tri phenylPhosphoranylidene) butanedioate (L-OH) at different temperatures (20, 30, 40, 50±1ºC) have been investigated potentiodynamically. The cathodic and anodic Tafel slopes values calculated from the polarization curves indicate that the corrosion rate decreases with increasing L-OH concentration. The corrosion potential (Ecorr) and passive potential (Ep) increased (shifted slightly toward positive potential) while corrosion current density (Icorr) and passivation current (Ip) decreased with increasing L-OH amount. Critical potential for passivity (Ecr) did not show any remarkable change but critical current density (Icr) often decreased with increasing L-OH concentration. Maximum inhibition efficiency (95%) is obtained for the alloy in acid solution containing 60 ppm of L-OH. The open circuit potential after polarization attained positive value indicating formation of passive film on the surface of experimental sample. Activation energy (Ea) and Gibbs free energy (∆Gads) for adsorption of L-OH are calculated. The values of ∆Gads decreased (attained more negative values) with increasing temperatures.
Page(s): 376-381
ISSN: 0971–457X
Source:IJCT Vol.14(4) [July 2007]

Files in This Item:

File Description SizeFormat
IJCT 14(4) (2007) 376-381.pdf231.5 kBAdobe PDFView/Open
 Current Page Visits: 663 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 510579 since 06-Feb-2009  Last updated on 11-Apr-2014Webmaster: nopr@niscair.res.in