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Electrochemical investigation of erosion-corrosion using a slurry pot erosion tester

Electrochemical investigation of erosion-corrosion using a slurry pot erosion tester
Electrochemical investigation of erosion-corrosion using a slurry pot erosion tester
The aim of this paper is to use a modified slurry pot erosion tester to perform in-situ electrochemical measurements during solid particle impingement to investigate the effects of velocity, sand size and sand concentration on a passive metal (UNS S31603). Samples are subjected to a set of erosion-corrosion experiments. The electrochemical response of UNS S31603 to the test parameters are plotted and compared to develop an understanding of the erosion-corrosion process. The current trend with variation of test parameters has been explained by an erosion enhanced corrosion synergistic effect. The current transients associated with depassivation and repassivation during solid particle impingement are observed through electrochemical noise measurements. It was observed that the increase in velocity and sand concentration increased the current levels during erosion-corrosion. However, the increase in sand size had a more complex response. Single particle impact experiments conducted revealed that the peak corrosion current and the repassivation time increased with increasing velocity. A linear trend was seen between the peak current and kinetic energy. A second order exponential decay was fitted to the repassivation kinetics of the single particle impact. SEM has been used to develop a mechanistic understanding of erosion-corrosion. The surface scars reveal that the depth of the craters and the length of the lips increase with increasing velocity. Micro-cracks also appear on these lips, believed to be due to corrosive action attacking the roots of these lips.
slurry pot erosion tester, erosion-corrosion, electrochemical noise
0301-679X
232-240
Rajahram, S.S.
d44f2574-2ec1-49c9-b81a-7f73eccc00d7
Harvey, T.J.
3b94322b-18da-4de8-b1af-56d202677e04
Wood, R J K
d9523d31-41a8-459a-8831-70e29ffe8a73
Rajahram, S.S.
d44f2574-2ec1-49c9-b81a-7f73eccc00d7
Harvey, T.J.
3b94322b-18da-4de8-b1af-56d202677e04
Wood, R J K
d9523d31-41a8-459a-8831-70e29ffe8a73

Rajahram, S.S., Harvey, T.J. and Wood, R J K (2011) Electrochemical investigation of erosion-corrosion using a slurry pot erosion tester. Tribology International, 44 (3), 232-240. (doi:10.1016/j.triboint.2010.10.008).

Record type: Article

Abstract

The aim of this paper is to use a modified slurry pot erosion tester to perform in-situ electrochemical measurements during solid particle impingement to investigate the effects of velocity, sand size and sand concentration on a passive metal (UNS S31603). Samples are subjected to a set of erosion-corrosion experiments. The electrochemical response of UNS S31603 to the test parameters are plotted and compared to develop an understanding of the erosion-corrosion process. The current trend with variation of test parameters has been explained by an erosion enhanced corrosion synergistic effect. The current transients associated with depassivation and repassivation during solid particle impingement are observed through electrochemical noise measurements. It was observed that the increase in velocity and sand concentration increased the current levels during erosion-corrosion. However, the increase in sand size had a more complex response. Single particle impact experiments conducted revealed that the peak corrosion current and the repassivation time increased with increasing velocity. A linear trend was seen between the peak current and kinetic energy. A second order exponential decay was fitted to the repassivation kinetics of the single particle impact. SEM has been used to develop a mechanistic understanding of erosion-corrosion. The surface scars reveal that the depth of the craters and the length of the lips increase with increasing velocity. Micro-cracks also appear on these lips, believed to be due to corrosive action attacking the roots of these lips.

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More information

Published date: March 2011
Additional Information: nCATS, National Centre for Advanced Tribology at Southampton, School of Engineering Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
Keywords: slurry pot erosion tester, erosion-corrosion, electrochemical noise
Organisations: Engineering Sciences

Identifiers

Local EPrints ID: 166275
URI: http://eprints.soton.ac.uk/id/eprint/166275
ISSN: 0301-679X
PURE UUID: 5e8399ec-0620-47aa-811f-b004cf3c389c
ORCID for R J K Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 27 Oct 2010 08:01
Last modified: 14 Mar 2024 02:37

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Contributors

Author: S.S. Rajahram
Author: T.J. Harvey
Author: R J K Wood ORCID iD

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