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(Coating Formulation) Coatings on the Edge of Forever

A continuing problem with coatings applied to sharp edges of a structure is the corrosion that often develops at the apex of the edge. The conventional wisdom is that the reduction of film thickness, due to coating pulling away at the edge during the curing of the coating, is the primary cause for the onset of corrosion. This theory, however, is not necessarily correct, both from a mechanistic and practical point of view.

Product Number: 12-COAT_DEC21
Author: Carl Reed / Kat Coronado
Publication Date: 2021
Industry: Coatings
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A continuing problem with coatings applied to sharp edges of a structure is the corrosion that often develops at the apex of the edge. The conventional wisdom is that the reduction of film thickness, due to coating pulling away at the edge during the curing of the coating, is the primary cause for the onset of corrosion. This theory, however, is not necessarily correct, both from a mechanistic and practical point of view. This discussion paper will present the conventional viewpoint of what is called “edge retention” or “edge coverage” and why it is insufficient in describing corrosion occurrence at an edge. Also discussed is how the current test methods provide non-relevant data to edge coverage observations.
A different mechanism of the causation of corrosion at an edge is presented as well as an alternative method for evaluating the effect of edge coverage on corrosion of the system.

A continuing problem with coatings applied to sharp edges of a structure is the corrosion that often develops at the apex of the edge. The conventional wisdom is that the reduction of film thickness, due to coating pulling away at the edge during the curing of the coating, is the primary cause for the onset of corrosion. This theory, however, is not necessarily correct, both from a mechanistic and practical point of view. This discussion paper will present the conventional viewpoint of what is called “edge retention” or “edge coverage” and why it is insufficient in describing corrosion occurrence at an edge. Also discussed is how the current test methods provide non-relevant data to edge coverage observations.
A different mechanism of the causation of corrosion at an edge is presented as well as an alternative method for evaluating the effect of edge coverage on corrosion of the system.

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