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This paper will evaluate methods used to measure surface profiles created by power tools, namely air needle scalers, bristle cleaners, and roto peen scalers. Particular focus will be placed on the use of replica tape and its ability to characterize profiles of various surfaces using a digital replica tape reader with 3D imaging capability. More specifically, this paper will determine if the measurement methods described in ASTM D44171are appropriate for the measurement of profiles produced by power tools.
This paper looks at the measurement of both profile and roughness on metal surfaces prepared specifically to receive a coating system in order to protect it from corrosion. The difference between roughness and profile is discussed, whether one is more relevant than the other, and the merits of the different measurement methods for both parameters.
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Coating performance is related to the profile height on a steel surface. Three types of devices are available to take measurements of this surface profile: replica tape, depth micrometers fitted with pointed probes, and stylus roughness testers. This paper presents results from a recent analysis of measurements taken by the three device types on steel blasted with an assortment of blast media and proposes a new method of depth micrometer measurement called average of the maximum peaks.
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.