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The NSRP Surface Preparation & Coatings (SP&C) Panel 2018 Update
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This workshop will review historical methods of data collection and the latest, ever evolving technology to provide rapid, accurate inspection results.
Recycled steel grit and shot have a well-established place in the industry and long, successful track record.
Departments of Transportation currently use the conventional three-coat system as the predominant choice for the corrosion protection of steel bridge structures. Eliminating one step in the coating process could potentially save time and cost associated with lane closures and traffic control costs. This research paper evaluates several two-coat systems based on the zinc-rich primer and polysiloxane top coat technology.
Of recent interest in the coatings world, is what to do when an abrasive blasted substrate does not meet the specified profile. For example, if the blast profile on a steel surface exceeds the specification limit, can the surface be reblasted with smaller abrasive blast media to reduce the profile into meeting the specification? At SSPC 2017 a paper was presented which addressed this scenario and found that the profile can be reduced using such reblasting process.
In the summer of 2014 Vulcan Painters spearheaded a project to do surface preparation and recoat seven historic military tanks, asking for help from the industrial painting community, from contractors and suppliers. The aim of the project was to finish the work without expense to the foundation that sought to build a new museum to house 200 years of U.S. Army armor and cavalry history.
The use of an Aromatic Polyurea lining in an effluent wastewater clarifier tank in Idaho in the Spring of 2017. This clarifier is owned by one of the world’s largest privately held companies with a proven track record in the Wastewater Industry. The clarifier is constructed out of carbon steel for the wall sections with about 4,000 square feet (372 square meters) of surface area. The floor of the clarifier is concrete and was not coated during the project as the coating on the concrete floor was still in good overall condition.
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.
PREPARATION FOR SSPC QP3 SHOP CERTIFICATION
Steel structures are often fabricated by bolting (or riveting) structural components together. Bolted joints result in multiple crevices between the bolted members and fasteners. These crevices are typically more susceptible to corrosion than flat surfaces because they tend to retain water/contaminants, they are difficult to properly coat, and the crevice geometry tends to support electrochemical phenomena that accelerate corrosion. This paper will evaluate the effectiveness of various coating practices at mitigating corrosion around these joints.
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.