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07082 SIMULATING POLARIZATION BEHAVIOR OF PROPELLER MATERIALS IN THE PHYSICAL SCALE MODELLING OF SHIPBOARD IMPRESSED CURRENT CATHODIC PROTECTION

Picture for 07082 SIMULATING POLARIZATION BEHAVIOR OF PROPELLER MATERIALS IN THE PHYSICAL SCALE MODELLING OF SHI

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Product Number: 51300-07082-SG

ISBN: 07082 2007 CP

Author: Yueping Wang and Ken J. KarisAllen

Publication Date: 2007

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Physical scale modelling (PSM) is a methodology in which a large structure subject to cathodic protection is physically modelled by maintaining a linear relationship between the model size and the conductivity of the electrolyte. In this way, the resistance path for current flow through the electrolyte for the model is maintained similar to that for the full-scale structure. PSM has been used in some NATO countries to evaluate and design shipboard impressed current cathodic protection (ICCP) systems. One issue that is not well resolved in the use of PSM is the altered polarization behavior of propeller materials in diluted seawater with reduced conductivity, as a result of the change in the conditioning film on these materials. Another issue is that the polarization behavior under flow conditions is not well represented in PSM. These issues affect the accurate modelling of shipboard ICCP systems.

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Physical scale modelling (PSM) is a methodology in which a large structure subject to cathodic protection is physically modelled by maintaining a linear relationship between the model size and the conductivity of the electrolyte. In this way, the resistance path for current flow through the electrolyte for the model is maintained similar to that for the full-scale structure. PSM has been used in some NATO countries to evaluate and design shipboard impressed current cathodic protection (ICCP) systems. One issue that is not well resolved in the use of PSM is the altered polarization behavior of propeller materials in diluted seawater with reduced conductivity, as a result of the change in the conditioning film on these materials. Another issue is that the polarization behavior under flow conditions is not well represented in PSM. These issues affect the accurate modelling of shipboard ICCP systems.

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