This paper compares the following six different surface preparation methods: (1) abrasive blasting with mineral sands, (2) ultra-high pressure water jetting (UHP WJ) uninhibited, (3) UHP WJ inhibited, (4) UHP WJ with garnet, (5) UHP WJ with sodium bicarbonate, and (6) power tool cleaning with flapper wheel. Six different types of coupons were used for this test. Four different types of actual process equipment coupons and two different types of mill-scaled coupons were used.

The following laboratory tests were run on each type of coupon: (1) invisible surface contaminant detection using a boiling extraction method for sulfates, phosphates, chlorides and nitrates, (2) scanning electron microscope (SEM) of the surface before and after cleaning, (3) photomicrograph of edge profile, (4) surface profiles before and after the cleaning, and (5) weight loss. Comparisons between the abrasive blasted coupons and UHP WJ coupons were made for each type of coupon. Also, comparisons between abrasive blasting and power tool cleaning were made.

Subject
Abrasive blasting, Water, Sulfates, Bicarbonates, Weight loss coupons, Contaminants, Garnet, Sodium, Weight loss, Corrosion inhibitors, Surface profile, Chlorides, Coupons
Keywords:
ultra-high pressure, UHP, ultra-high pressure water jetting, UHP WJ, surface preparation, surface prep, water blasting, sandblasting, surface contaminants, invisible surface contaminants
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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