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Ships hull corrosion diagnosis from close measurements of electric potential in the water

Published online by Cambridge University Press:  21 October 2010

A. Guibert ,
O. Chadebec ,
J.-L. Coulomb ,
C. Rannou  and
R. P. Nogueira
A. Guibert*
Affiliation:
G2Elab (UMR 5269 INPG-UJF-CNRS), ENSIEG, BP 46, 38000 Grenoble, France DGA/GESMA, Département DDBF BP 42, 29240 Brest Armées, France
O. Chadebec
Affiliation:
G2Elab (UMR 5269 INPG-UJF-CNRS), ENSIEG, BP 46, 38000 Grenoble, France
J.-L. Coulomb
Affiliation:
G2Elab (UMR 5269 INPG-UJF-CNRS), ENSIEG, BP 46, 38000 Grenoble, France
C. Rannou
Affiliation:
DGA/GESMA, Département DDBF BP 42, 29240 Brest Armées, France
R. P. Nogueira
Affiliation:
LEPMI (UMR 5269 INPG-UJF-CNRS), 1130 rue de la Piscine, 38000 Grenoble, France
*
arnaud.guibert@g2elab.inpg.fr
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Abstract

We present here an original application linking an electrochemical domain and the computational aspect of electromagnetic fields to make a corrosion diagnosis of a protected underwater steel structure. After a defined operating time, it is mandatory to check an underwater steel structure. This control may happen too early, if the protection has not been damaged; but it may happen too late, if some particularly bad environmental conditions have already damaged the structure. Moreover, current examination techniques require immobilizing the structure for a long time: they may be complicated to dry (pipe lines or tanks) or to place in dry docks for vessels. The efficiency of these techniques could be improved. The purpose of this paper is to replace this checking/examination by a series of close electrical measurements in the electrolyte which provides a corrosion diagnosis of the structure. This also allows computing the electric and magnetic fields caused by this phenomenon everywhere in the electrolyte. The new method introduced ensures a great time-saving but also an accuracy never reached before.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 52 , Issue 2: Focus on Numelec , November 2010 , 23310
Copyright
© EDP Sciences, 2010

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