Sulfuric acid is one of the most important elementary substances of the chemical industry. The acic has found a wide variety of applications in industry today, e.g. fertilizer, chemicals, pigments & paints, petroleum, textiles & films, iron and steel etc..

Because of the changing character of the acid over the concentration, i.e. for concentrations highei than about 85 % the acid becomes oxidizing, there is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range up to boiling temperature. Alloys like 825 and alloy 20 can be used today only for temperatures up to 50 °C.

This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys.

The influence of copper and silicon additions on the corrosion resistance is described. On the basis of the beneficial influence of some element additions a new alloy modification for service in diluted and medium concentrated sulfuric acid up to boiling temperature was tested.

Subject
Acids, Materials, Corrosion resistant alloys, Stainless alloys, Acid concentration, Sulfuric acid, Nickel based alloys, Copper alloys, Commercial alloys, Silicon, Corrosion resistance, Copper, Stainless steel
Keywords:
sulfuric acid, boiling temperature, influence of element additions
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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