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Adhesion Failure Mode Analysis: Cyclic Peel Testing in Synthetic Sea Water

Adhesion Failure Mode Analysis: Cyclic Peel Testing in Synthetic Sea Water
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In this paper, I will discuss such an example of when the predicted service of the coating determines that a more dynamic method must be utilized. I will discuss testing that was conducted for immersion service where flow of water over the surface was a major consideration. The question of how well the adhesion would hold up in real life service could not be properly answered by the degree of failure in this case. I discovered that the more important consideration was the survivability of the coating if a defect were introduced.

Product Number: 41209-482-SG
Author: Ray Holden
Publication Date: 2009
Industry: Coatings
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Adhesion is a very important consideration in adhesives and coatings. Many of the methods commonly used to measure coating failure deal with the degree to which loss of adhesion occurs. A force is applied on a bonded film at a predetermined rate and the degree to which it fails is then quantified in some manner. In this scenario, two inches of peel is worse than one inch of peel. The more material that can be removed by the applied force, the better predictor of future coatings failure the method produces. When selecting a dynamic adhesion testing method, the degree of coating failure may not be as important as where the failure takes place within a coating system. Careful consideration of the mode of failure needs to be given in order to provide a complete predictor of failure over time. In this paper, I will discuss such an example of when the predicted service of the coating determines that a more dynamic method must be utilized. I will discuss testing that was conducted for immersion service where flow of water over the surface was a major consideration. The question of how well the adhesion would hold up in real life service could not be properly answered by the degree of failure in this case. I discovered that the more important consideration was the survivability of the coating if a defect were introduced.

Adhesion is a very important consideration in adhesives and coatings. Many of the methods commonly used to measure coating failure deal with the degree to which loss of adhesion occurs. A force is applied on a bonded film at a predetermined rate and the degree to which it fails is then quantified in some manner. In this scenario, two inches of peel is worse than one inch of peel. The more material that can be removed by the applied force, the better predictor of future coatings failure the method produces. When selecting a dynamic adhesion testing method, the degree of coating failure may not be as important as where the failure takes place within a coating system. Careful consideration of the mode of failure needs to be given in order to provide a complete predictor of failure over time. In this paper, I will discuss such an example of when the predicted service of the coating determines that a more dynamic method must be utilized. I will discuss testing that was conducted for immersion service where flow of water over the surface was a major consideration. The question of how well the adhesion would hold up in real life service could not be properly answered by the degree of failure in this case. I discovered that the more important consideration was the survivability of the coating if a defect were introduced.

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