Understanding Localized Corrosion

A quasi 2-D localized corrosion model

In 1996 Pots has written a two-dimensional (2-D) stochastic algorithm to simulate the morphology of localized attack. The rule based algorithm operates on the assumption that the morphology of corrosion attack depends on the balance of two processes: corrosion (leading to metal loss) and precipitation (leading to metal protection). The rules of the original algorithm were modified to enable sim...

Understanding the Corrosion Mechanism in Chrome Coatings

Understanding Corrosion Mechanisms in Oxy-Fired Systems

Replacing air with oxygen in coal-fired boilers (i.e. oxy-firing) combined with flue gas recirculation is a leading strategy to concentrate CO2 and assist in carbon capture and sequestration. A significant area of concern is the fireside corrosion with oxy-firing due to the higher CO2 levels in the combustion gas and potentially higher SOx and H2O levels. In order to investigate this complicate...

Origins of Persistent Interactions among Localized Corrosion Sites

It is often believed that pitting events are stochastic without any spatial or temporal effect on each other. However, as pits begin to form, the local environment changes [1]. Solution concentration and potential gradients develop that can affect pitting susceptibility on adjacent surfaces. These factors can also affect nearby oxide film and non-metallic inclusions to produce more permanent in...

Origins of Persistent Interaction among Localized Corrosion Sites

Interactions amongst localized corrosion sites were investigated using multi-electrode arrays. The 5x20 array consisted of one hundred 250 μm AISI 316 stainless steel wires configured into a close packed rectangle. Experiments were conducted in 0.05 M NaCl to investigate interactions triggered by the presence of active pits. Interactions between primary pits and the adjacent electrode surface w...