Oxalate coatings can be used to increase lubricant retention on nickel alloy tube or wire surfaces during cold drawing operations. Prior to cold drawing, the tubes or wires are immersed in a sulfuric acid "activation" solution and then immersed in a commercial oxalate "coating" solution. An insoluble, addherent metal oxalate corrosion product layer forms on the alloy surface during immersion in the coating solution. The efficient formation of this metal oxalate layer requires a high initial corrosion rate. The presence of a passivating surface film supresses the metal oxalate layer formation. Since the coating mechanism is electrochemical in nature, the potentiostat was used to investigate some oxalate coating problems encountered in mill production.

Subject
Coatings, Active corrosion, Filler metals, Sulfuric acid, Nickel based alloys, Anodic polarization curves, Copper alloys, Solutions, Immersion, Anodic polarization, Alloys, Electrodes, Corrosion potential
© 1975 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).
1975
Association for Materials Protection and Performance (AMPP)
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