test Browse by Author Names Browse by Titles of Works Browse by Subjects of Works Browse by Issue Dates of Works
       

Advanced Search
Home   
 
Browse   
Communities
& Collections
  
Issue Date   
Author   
Title   
Subject   
 
Sign on to:   
Receive email
updates
  
My Account
authorized users
  
Edit Profile   
 
Help   
About T-Space   

T-Space at The University of Toronto Libraries >
School of Graduate Studies - Theses >
Master >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/17233

Title: Improvement of Passivity of Fe - xCr Alloys (x < 10%) by Cycling Through the Reactivation Potential
Authors: Ulaganathan, Jaganathan
Advisor: Newman, Roger C.
Department: Chemical Engineering and Applied Chemistry
Keywords: Fe - Cr
Low-Cr alloys
Potential cycling
Issue Date: 26-Feb-2009
Abstract: Classically 13% Cr is required for stable passivity of steel in acidic and neutral solutions. Some authors (Mansfeld, Fujimoto) have published potential cycling procedures that generate thick Cr-rich films. Fujimoto cycles right to the transpassivity potential and back in H2SO4 solution. Our idea is to work close to the reactivation potential where the passive film (Fe2O3) is reductively dissolved to Fe2+. While using an equimolar acetate buffer (pH 4.7), we have obtained new insights into the reactivation process. It is under a kind of thermodynamic control, in that the film cannot be reduced, and the metal cannot be dissolved, faster than would exceed the equilibrium concentration of Fe2+ at the electrode surface. Reductive dissolution leads to gel-like Cr-rich film, but Fe dissolution occurs through it, if formed in a single step. However alternating formation and reductive dissolution of a Fe-rich film assist the formation of a more robust Cr-rich film
URI: http://hdl.handle.net/1807/17233
Appears in Collections:Master
Department of Chemical Engineering and Applied Chemistry - Master theses

Files in This Item:

File Description SizeFormat
Ulaganathan_Jaganathan_200811_M.A.Sc_Thesis.pdf1.63 MBAdobe PDF
View/Open

Items in T-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

uoft