Abstract

Electrochemical Impedance Spectroscopy (EIS) measurements were performed to investigate the corrosion resistance of 18 alloys under conditions similar to the Space Transportation System (STS) launch environment. The UNS(1) numbers of the alloys used were: R60702, N06022, N06625, N10276, N06455, N06600, S32950, S32550, N06985, N08020, N08904, N08825, S31603, S31703, S31803, S30403, N10665, and N04400. AC impedance data were gathered for all the alloys at various immersion times in aerated 3.55% NaCl-0.1N HCl. This electrolyte provides an environment for the corrosion of the alloys similar to conditions at the launch pad.

Polarization resistance values were obtained from the Nyquist plot at each immersion time by curve fitting methods. N06022 showed the highest overall values for Rp while N04400 and N06600 had the lowest overall values.

Subject
Electrochemical impedance spectroscopy, Materials, Corrosion resistant alloys, Corrosion rate, Materials performance, Inspection, Impedance measurements, Metals, Hose, Pitting, Immersion, Alloys, Electrolytes
Keywords:
AC impedance, alloys, polarization resistance, corrosion resistance, hydrochloric acid, sodium chloride
© 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)
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