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Over the past 35 years in I have had the opportunity to witness the good the bad and ugly in the coatings business, primarily industrial and marine but in the last 15 years have included commercial and residential via the consulting, failure analysis and expert witness testimony endeavors.
Over the past 35 years in I have had the opportunity to witness the good the bad and ugly in the coatings business, primarily industrial and marine but in the last 15 years have included commercial and residential via the consulting, failure analysis and expert witness testimony endeavors. The best way to describe “the good, the bad and the ugly is with photographs”, unfortunately most of my photographs represent the bad and ugly. I guess it is human nature to not take many pictures of the good unless you are entering a photo contest or want to show your client how well his project looks.
Shot blasting as a mechanical surface preparation process is widely used in finishing metallic parts. Sophistication in the use of this technique could range from simple manual systems to computer-controlled equipment for preparing aerospace and automotive components.
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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.
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.