Galvanic Corrosion Modeling In Flowing Systems
Author(s)
D. A. Shifler
Abstract
Contact between dissimilar alloys will generate galvanic currents based on a
variety of factors. The extent of risk to the overall systems and specifically to
the more electronegative alloy materials can be clarified if the magnitude of the
corrosion rate at various locations can be modeled and calculated.
When a more electropositive cathode alloy is separated from the
electronegative anode alloy in a complex geometry, there will be a variable
distance between the anode and cathode and fluid flow characteristics may
influence variations in the limiting current density. In systems containing
elbows, the current and potential distribution will not be only in the longitudinal
direction, but will have a radial contribution to current flow and corresponding
potential changes.
Keywords: galvanic corrosion, current distribution, flow, modeling, piping,
boundary layer, polarization, dissimilar alloys, bimetallic corrosion.
1 Introduction
The effect of coupling two different metals/alloys together, either directly or
through an external path, increases the corrosion rate of the anodic alloy (the
material with the more electronegative potential) and reduces or suppresses the
corrosion rate the cathodic alloy (the material possessing the more
electropositive potential). The electrochemical degradation derived from the
joining of two or more different or dissimilar alloys is termed galvanic corrosion.
Galvanic corrosion causes failures in a wide variety of environments such as
atmospheric, automotive, seawater, soil, freshwater, or oil and gas.
The necessary conditions for galvanic corrosion require: (1) dissimilar alloys,
(2) electrical contact, either directly or by a secondary, grounding path, between
the dissimilar alloys, and (3) an electrolyte. The coupling of dissimilar alloys in
conducting, corrosive solutions such as seawater, oil and gas, and biological
Keywords
galvanic corrosion, current distribution, flow, modeling, piping,
boundary layer, polarization, dissimilar alloys, bimetallic corrosion.
Related Book
Other papers in this volume
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