Polarization Characteristics Of Geometrically
Confined Spaces
Author(s)
M. Krupa, E. J. Lemeiux, A. Lueng, E. A. Hogan,
V. G. DeGiorgi & A. Seelinger
Abstract
With the advent and application of Impressed Current Cathodic Protection
(ICCP) systems to confined spaces, the ability of an externally controlled ICCP
system to effect sufficient cathodic protection to internal components is
questionable. This paper seeks to evaluate the ability of ICCP systems to
provide adequate corrosion control for confined and sensitive surfaces. Both a
boundary element and a physical model were utilized to understand the effects of
current distribution within a confined space, through a 1.27 mm gap. Initially,
tests were performed to quantify polarization levels in a simplified parallel plate
configuration. Then more complicated geometries and materials were modeled
to effectively evaluate real world scenarios. Previous tests have determined that
adequate cathodic polarization is achieved for simple and complex geometries at
the increased driving voltages experienced with sacrificial anode systems. The
results of this work provide evidence that adequate cathodic protection may be
provided at controlling potentials more electropositive to conventional galvanic
cathodic protection system.
Keywords: confined, gap, cathodic protection, corrosion, impressed current.
1 Introduction
Physical Scale Modeling (PSM) has been used extensively by the Naval
Research Laboratory (NRL) to determine appropriate positioning and size of
ICCP system components on Navy vessels [1]. Anode and controlling reference
cell positions are determined by analysis of potential profiles collected from the
Keywords
confined, gap, cathodic protection, corrosion, impressed current.
Related Book
Other papers in this volume
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