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New Developments in Surface Profile Measurement for Blast Cleaned Surfaces

New Developments in Surface Profile Measurement for Blast Cleaned Surfaces
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When protective coatings are to be applied to structures, it is important that the surface is clean and dry if premature failure of the coating is to be prevented and the full coating service life achieved. In many situations for both new build and repair of structures, blast cleaning of the surface is required to remove contamination and to create an anchor pattern to enhance the adhesion of the coating system to the substrate. 

Product Number: 41213-746-SG
Author: J F Fletcher
Publication Date: 2013
Industries: Test Method , Coatings
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$20.00
$20.00

When protective coatings are to be applied to structures, it is important that the surface is clean and dry if premature failure of the coating is to be prevented and the full coating service life achieved. In many situations for both new build and repair of structures, blast cleaning of the surface is required to remove contamination and to create an anchor pattern to enhance the adhesion of the coating system to the substrate. The measurement of the profile is important in achieving the specification but also to ensure that the blast cleaning process is in control and not producing inadequate or excessive profile height. There are two ASTM standards that deal with surface profile assessment, D 4417, Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel, and D 7127, Standard Test Method for Measurement of Surface Roughness of Abrasive Blast Cleaned Metal Surfaces Using a Portable Stylus Instrument. D 4417 describes three methods for either assessing the profiled surface, Method A the surface comparator, or measuring the profile height, Method B, the Depth Gauge and Method C, Replica Tape. D 7127 describes the stylus measurement technique giving results for both profile height and peak density. This paper describes the equipment that is currently available for these test methods and discusses the differences in both the methods and the resulting measurements including the calibration of the surface comparators. The significance of these differences will be analyzed in the context of typical grit and shot blasted surfaces

When protective coatings are to be applied to structures, it is important that the surface is clean and dry if premature failure of the coating is to be prevented and the full coating service life achieved. In many situations for both new build and repair of structures, blast cleaning of the surface is required to remove contamination and to create an anchor pattern to enhance the adhesion of the coating system to the substrate. The measurement of the profile is important in achieving the specification but also to ensure that the blast cleaning process is in control and not producing inadequate or excessive profile height. There are two ASTM standards that deal with surface profile assessment, D 4417, Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel, and D 7127, Standard Test Method for Measurement of Surface Roughness of Abrasive Blast Cleaned Metal Surfaces Using a Portable Stylus Instrument. D 4417 describes three methods for either assessing the profiled surface, Method A the surface comparator, or measuring the profile height, Method B, the Depth Gauge and Method C, Replica Tape. D 7127 describes the stylus measurement technique giving results for both profile height and peak density. This paper describes the equipment that is currently available for these test methods and discusses the differences in both the methods and the resulting measurements including the calibration of the surface comparators. The significance of these differences will be analyzed in the context of typical grit and shot blasted surfaces

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