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Dry film thickness (DFT) is an important parameter of coating application, and both low and high DFTs can result in coating failures. Typically, DFTs are measured in accordance with SSPC-PA 2, “Procedure for Determining Conformance to Dry Coating Thickness Requirements” (1), or other similar standards. Recent advancements in technology have resulted in DFT probes capable of achieving a higher rate of DFT data collection than previous devices.
Dry film thickness (DFT) is an important parameter of coating application, and both low and high DFTs can result in coating failures. Typically, DFTs are measured in accordance with SSPC-PA 2, “Procedure for Determining Conformance to Dry Coating Thickness Requirements” (1), or other similar standards. Recent advancements in technology have resulted in DFT probes capable of achieving a higher rate of DFT data collection than previous devices. However, current standards do not take full advantage of the technology, and little is known of the effects of scanning probe wear on DFT accuracy and precision. In order to obtain higher confidence in DFT characterization of critically coated areas, a study has been completed to perform a statistical comparison of results obtained between the traditional non-scanning method and new scanning methods of DFT data collection. Results of this study have been used to develop recommendations for field implementation procedures to take full advantage of this technology
Over recent years there have been interesting developments in the way marine coatings and linings are specified that have unwittingly resulted in a situation that can make it challenging to meet a paint specification as currently written.
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The five-year review of D7091, Standard Practice for Non-destructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals is due to be completed by the end of 2018. The main update to this standard practice is the addition of the concept of scanning probes. Scanning probes are configured to take reading continuously at a rate of more than two reading a second while the probe is in contact with the coating.
This paper will cover cathodic disbondment, dry film thickness, peak height and coating evaluation for failures.