A scanning electron microscope study of the effects of anode velocity and current density on the corrosion of ship hull zinc in synthetic seawater
Luebke, William Howard
Perkins, A. Jeff
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The structure of corrosion products formed on anodic ship hull zinc due to impressed current in synthetic sea-water electrolyte was studied as a function of anode velocity, current density, and current-time product. Under dynamic situations, corrosion product growth is discussed for a variety of current densities, and a model is developed considering hydrodynamic and diffusion boundary layer effects on electric al double layer stability. Conditions leading to the formation of various corrosion product types are defined and their development with time is followed. The effects of various velocities, current densities, and current-time products on the development of ZnO platelet networks, ribbonlike corrosion products, and anodic passivation layers are analyzed in static and dynamic environments and models for the sequential observations are developed. A model controlled by current density is offered for static conditions at low and moderate current densities, leading to either non-passivating network layers or compact passivating layers depending on the conditions. A corrosion product growth/removal cycle is hypothesized for very-high current density/high velocity situations which does not lead to zinc anode passivation.
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