Erosion-corrosion of mild steel in hot caustic. Part II: The effect of acid cleaning

Rihan, R. and Nesic, S. (2006) Erosion-corrosion of mild steel in hot caustic. Part II: The effect of acid cleaning. Corrosion Science, 48 9: 2660-2675. doi:10.1016/j.corsci.2005.09.019

Author Rihan, R.
Nesic, S.
Title Erosion-corrosion of mild steel in hot caustic. Part II: The effect of acid cleaning
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1016/j.corsci.2005.09.019
Volume 48
Issue 9
Start page 2660
End page 2675
Total pages 16
Editor G. T. Burstein
Place of publication Oxford
Publisher Pergamon-Elsevier Science Ltd
Language eng
Subject C1
290501 Mechanical Engineering
660401 Industry
0913 Mechanical Engineering
Abstract Corrosion rates of 1020 steel in 2.75 M NaOH solution at a temperature of 160 degrees C and velocities of 0.32 and 2.5 m/s were studied. The focus was on the effect of the acid cleaning which was performed by using strong, inhibited sulphuric acid in between the exposures to caustic. In situ electrochemical methods were used to measure the corrosion rate such as the potentiodynamic sweep and the polarization resistance method. Also used were the weight-loss method and scanning electron microscopy (SEM). Eight electrodes/coupons were used to monitor the metal loss rate, four were placed at the low velocity section, while the other four were placed in the high velocity section of a high temperature flow. The first three coupons in each section were placed within the disturbed flow region, while the fourth was placed in a fully developed flow region. During the exposure of mild steel to the inhibited acid, following the first caustic period, the corrosion rate increased significantly to between 3 and 10mm/y with a few electrodes experiencing as high as 50 mm/y. The second caustic period following the acidic period typically started with very high corrosion rates (20-80 mm/y). The length of this corrosion period was typically 2-3 h with a few exceptions when the high corrosion period lasted 7-10 h. Following the very high corrosion rates experienced at the beginning of the second caustic period, the corrosion rates were reduced sharply (as the corrosion potential increased) to nearly the same levels as those observed during the passive part of the first caustic period. (c) 2005 Elsevier Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Nickel Flow Loop
Mild Steel
Heat Exchanger
Test Section
Electrochemical Measurements
Disturbed Flow
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
2007 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 18:43:18 EST