This paper describes the development of testing equipment designed to determine the erosion-corrosion resistance of materials exposed to geothermal steam, specifically those in turbine components. This paper also reviews results from exposure tests to verify the creation of erosive-corrosive conditions in the equipment. These tests were performed on low carbon steel and UNS S17400 stainless steel samples. The results show that the equipment appears to create conditions allowing for testing of erosion-corrosion of samples. Based on these tests it is also clear that there is a difference between the conditions created in each sample holder of the equipment although it cannot be quantified. Additionally, there also appears to be a difference between the environmental conditions present for each batch.

Coatings applied to different substrates have been investigated in the erosion-corrosion equipment and this report reviews behavior of pure titanium applied through electric arc spraying on a carbon steel and stainless steel substrate with a Ni-Al bond coat. The titanium coatings showed good resistance to erosion-corrosion. They are however porous which can allow for corrosion of the base material and potential failure of the coating.

Subject
Test methods, Geothermal energy, Coatings, Materials, Silica, Corrosion products, Fluids, Equipment, Titanium, Risk reduction, Erosion corrosion, Scaling, Samples
Keywords:
equipment, erosion-corrosion, geothermal environment, turbine, electric arc spraying, titanium coating
© 2019 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).
2019
Association for Materials Protection and Performance (AMPP)
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