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Influence of Additives on the Transpassive Dissolution of Ferritic Steels in Phosphoric Acid-Acetic Acid Electrolytes

The extent of service life of components manufactured from ferritic steels in a variety of industrial environments is determined not only by the alloy composition and preparation procedure, but also by the degree of geometrical,chemical and energetical heterogeneity of the exposed alloy surfaces. Thus optimised surface treatment procedures, such as electropolishing and anodic levelling are called for in order to increase the resistance of such steels to both general and localised corrosion. It is well known that electropolishing of ferritic steels takes place via partly mass-transfer controlled dissolution in the transpassive regime. In order to optimise the electropolishing process, an increase of the fundamental understanding of the mechanism of transpassive dissolution is essential.