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ID 21449
file
creator
Murakami, Moritoshi
subject
Erosion-corrosion
Breakaway velocity
Jet-in-slit apparatus
Mass transfer equation
Copper alloy
NDC
Technology. Engineering
abstract
Erosion-corrosion tests on copper and three types of copper alloys in a 1 wt% solution of CuCl2 were carried out at various flow velocities using a jet-in-slit testing apparatus, which is capable reproducing various hydrodynamic conditions. A damage profile of a specimen was developed using a surface roughness meter to evaluate locally occurring damage. The damage depth rate for copper, beryllium copper and a 70/30 copper nickel alloy increased with increasing flow velocity, and suddenly increased at a certain velocity, which is called the breakaway velocity. The breakaway velocities at the central and disturbed part of a specimen were different for each sample, indicating that the hydrodynamic conditions of the flowing solution had an effect. The damage depth rate, calculated from the mass transfer equation, which involved mass transfer in the concentration diffusion layer and in the corrosion product film, could be fitted to the experimental data, suggesting that the mass transfer equation can be applied to the evaluation of erosion-corrosion damage. The corrosion product film was exponentially broken away at velocities higher than the breakaway velocity. The breakaway properties of the corrosion product film were confirmed to be different for each material, since the power of the exponential equation was different for each sample.
journal title
Werkstoffe und Korrosion : Materials and corrosion
volume
Volume 59
issue
Issue 1
start page
25
end page
31
date of issued
2008-01-25
publisher
Wiley-VCH Verlag GmbH
issn
0947-5117
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
relation url
department
Graduate School of Engineering