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Variables That Can Affect Pull Off Adhesion of Coatings

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Adhesion is a physical property that is crucial in many coatings, sealants, and adhesive applications, be it automotive, marine, or aerospace for example. Pull-off adhesion testing is an important tool in evaluating a coating’s performance, particularly while comparing pre- and post-exposure results. No matter what the application, the method for testing adhesion along with selecting the appropriate testing criteria has been the subject of multiple studies and reviews in the historical literature.

Product Number: 51323-19147-SG
Author: Swapnil Shukla, Nicole Rakers, Michael McCarthy, Bernard McPeak
Publication Date: 2023
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$20.00
$20.00

Pull-off adhesion testing is used to gage adhesive strength of the coating once applied and cured as per manufacturer’s guidelines. This test method is commonly used on the coatings after accelerated exposure testing and in the field. The mode of failure and the pull-off pressure obtained can be crucial in confirming proper surface preparation and coating application as well as understanding the performance of a coating. Additionally, evaluating pull-off adhesion before and after different lengths of exposure can go a long way in estimating adhesion retention and can be a crucial factor in product development. One challenge to this test method is the potential variability in results which can come from multiple factors. This paper will attempt at evaluating the extent of variability introduced into this test from different factors.

Pull-off adhesion testing is used to gage adhesive strength of the coating once applied and cured as per manufacturer’s guidelines. This test method is commonly used on the coatings after accelerated exposure testing and in the field. The mode of failure and the pull-off pressure obtained can be crucial in confirming proper surface preparation and coating application as well as understanding the performance of a coating. Additionally, evaluating pull-off adhesion before and after different lengths of exposure can go a long way in estimating adhesion retention and can be a crucial factor in product development. One challenge to this test method is the potential variability in results which can come from multiple factors. This paper will attempt at evaluating the extent of variability introduced into this test from different factors.

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Pull-off adhesion testing is widely used to assess the protective coating process. It is also used to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate. 
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Pull-off adhesion testing of coatings is commonly used for product testing and qualification as well as quality control / quality assurance. However, initial adhesion values do not necessarily correlate with service life of coatings or their corrosion protection performance. Adhesion of several product chemistries to steel is examined in this study before and after immersion exposure. Results are presented within the context of laboratory corrosion testing in an effort to investigate the significance of adhesion testing in modern lining systems.
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