For years nickel-based and cobalt-based alloys have been used to help control corrosion and wear in the chemical process industries. Today, as environmental concerns increase, the use of high alloys in industrial and hazardous waste treatment facilities for solving chronic materials problems is increasing. Such high alloys help to ensure safe and reliable equipment operation while often times reduce maintenance and down-time costs.

Field testing of Ni-and Co-based alloys in waste treatment applications are discussed. Examples are provided to highlight applications in incinerator off-gas scrubber components, acid reclamation vessels, sewage and municipal waste treatment facility components and acid waste hauler corrosion liners. Typical modes of failure of low alloys due to the existence of aggressive conditions in these applications are referenced.

Prototype construction and service performance of critical equipment made from high alloys help justify their use. Meaningful corrosion data and/or prototype field performance can be utilized to determine estimated life-cycle costs which include not only capital expenditure of the equipment but also expected downtime, maintenance and replacement costs. Specifically, case histories involving UNS N06022; nominally 57Ni-22Cr-13Mo-3W-3Fe and UNS NO6030; nominally 43Ni-30Cr-5Mo-2W 15Fe will be reviewed. In addition to these two Ni-based alloys, a cobalt-based alloy (nominally 53Co-26Cr-9Ni-5Mo-2W-3Fe, designed to resist both corrosion and wear, will also be presented. The technical merit and cost effectiveness of these high alloys in comparison to other alloys (Table 1) will also be discussed.

Subject
Acids, Costs, Materials, Corrosion resistant alloys, Stainless alloys, Corrosion rate, Materials performance, Nickel based alloys, Copper alloys, Corrosion resistance, Stainless steel, Alloys, Wastes
Keywords:
Incineration, deep well injection, Ni-based alloys, corrosion and wear
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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