Electrochemical studies and solution ion analyses have been performed on 13Cr steel to determine the efficacy of minimizing corrosion following an HCl acid stimulation treatment by the introduction of an oxidizing fluid to repassivate the surface. The three-fluid sequence utilized consisted of an acid stage, a passivating fluid, and finally a spent-acid stage. Several oxidizing solutions were tested, including nitric acid, chromate, molybdate, carbonate, and nitrite solutions. Variations of the Navy solution, an aqueous solution of 0.5% NaNO2/0.25% Na2HPO4/0.25% NaH2PO4, were also attempted. Although several oxidizing solutions did successfully passivate 13Cr following the acid treatment, with the best results coming from 1 % Na2CrO4, 1 and 5% Na2MoO4 and 1% Na2CO3/0.125% Na3PO4 solutions, none proved resistant to the subsequent spent-acid solution.

Subject
Acids, Steel surfaces, Ions, Corrosion rate, Chloride solutions, Nitric acid, Experimental data, Corrosion inhibitors, Steel, Polarization, Linear polarization resistance, Electrodes, Corrosion potential
Keywords:
electrochemical, passivation, 13Cr steel, corrosion, hydrochloric acid, spent-acid, carbon dioxide, oxidizing, Navy solution
© 1994 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1994
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.