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This presentation will outline the results and conclusions of a number of years of testing and experience in surface preparation for high-performance coatings. Testing has shown that there are several important variables that are not routinely monitored and controlled on most coating projects. The pertinent variables will be identified, and guidance will be provided on appropriate treatment of the variables to achieve the maximum results from the chosen coating.
This presentation will outline the results and conclusions of a number of years of testing and experience in surface preparation for high-performance coatings. Testing has shown that there are several important variables that are not routinely monitored and controlled on most coating projects. The pertinent variables will be identified, and guidance will be provided on appropriate treatment of the variables to achieve the maximum results from the chosen coating. The information is generic and applicable to all types of coatings, including both liquid, high solids, plural component and most types of powder coatings. The majority of testing was accomplished on surfaces prepared using recyclable metallic abrasives. However, the variables are equally applicable to surface preparation using any abrasive type that is capable of continuously preparing the surface with a properly profiled, clean, backside contamination free surface.
Many modern electronic gauges have the capability for transmitting or uploading data to a computer via a data port. This can mean transferring the data to a spreadsheet for customized analysis or to a data management software package for analysis using standard statistical methods. This paper describes the format of the data for a range of gauges used for the coating inspection process including surface profile determination, climatic condition monitoring and coating thickness measurement.
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Coating performance and longevity is highly dependent on the quality of substrate surface preparation. The effect of profile height, profile type (e.g., type of tool used to perform the prep, angularity of profile, etc.), extent of cleanliness, and amount of chloride contamination on coating performance were all studied to determine the correlation between these factors in an attempt to identify the primary factor in coating failure due to improper surface preparation.
Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity. The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.