Commercial magnesium anodes were evaluated using ASTM G97-89 as standard test and attached to the ASTM test arrangement a technique of electrochemical impedance was also used. Cylindrical samples were cut from the as-cast Mg anodes. Several heat treatments and different cooling rates were carried out. The anodic efficiency was determined as a function of the cooling rate, showing an increment around 10 to 12% above the efficiency showed by the non-treated commercial anodes (as-cast condition). The efficiency increments were related to the microstructural characteristics i.e particle size and/or grain size. Also some morpholgical aspects were considered.The appearance of second phase particles influences the different forms that the corrosion process exhibits.

Subject
Scanning electron microscopy, Galvanic anodes, Microstructure, Precipitates, Magnesium anodes, Film formation, Heat, Pitting, Grain boundary, Heat treatment, Grain, Uniform corrosion, Anodes
Keywords:
Magnesium, Anodes, Heat Treatment, Efficiency
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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