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Blister Initiation Mechanism of FBE Coatings

FBE Coating blistering is a common failure mode. Previously we have attributed the blister mechanism to four stages – nucleation incubation blistering and growth. For a FBE coating there are always some spent abrasives and air/moisture voids at the coating/steel interface. This kind of coating defect is a small delamination type of defect which serves as the initiation site for the coating blister. Normally this type of defect is very small about the size of a fraction of the coating dry film thickness (DFT). For such a small size defect size the pressure has to be over several thousand psi to cause blister formation. The source of the pressure can be osmotic pressure or coating swelling compressive stresses and hard to reach to such a high value. Osmotic pressure is from the residual soluble salts on steel surface. However if the defects can extend to large size to reach a few times of DFT the pressure required is much smaller. The purpose of this paper is to investigate the possible cause to expand the defect size to a large size. Finite element analysis method is used to calculate the stresses at the edge of the defect to explore the possibly to extend the defect size.

Product Number: 51319-13508-SG
Author: Benjamin Chang
Publication Date: 2019
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