Analysis of Coating Blister Failures and Associated Coating and Substrate Risks

From JPCL, April 2020

By Michael Kibler and Patrick Cassidy, Elzly Technology Corp.; and and Jay Ong, Naval Surface Warfare Center, Carderock

For years, the causes and mechanisms of blistering have been studied to determine its effects on coating performance and underlying substrates. The authors present results of a recent U.S. Navy study in which it was determined that the substrate below a blister may be more prone to pitting in certain exposures, suggesting a need for a better understanding of how to evaluate blistered coatings when considering repairs....

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Tagged categories: Blistering; Coating failure; Coating inspection; Failure analysis; Quality Control

Comment from Richard Devick, (6/15/2020, 8:02 AM)

What about inter coat adhesion failure? The top coat(last coating applied) does not blister. It is soundly attached to the previous paint, but there is a failure at the interface of the paint and substrate. Further a substrate can be too hot,or in dark colors the top coat can blister as human skin can when exposed to the sun. I mfg. painting Florida andI believe we have different issues whereby the paint is NOT the point of failure, but the effect of an other cause.

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