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Conditioning Of Steel Surfaces With Various Abrasive Blast Media And Effect On Coating Performance

Picture for Conditioning Of Steel Surfaces With Various Abrasive Blast Media And Effect On Coating Performance
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Over the past few decades surface preparation standards have been implemented to provide guidance on determining the necessary surface cleanliness for specific applications. Prior to such standards, surfaces were prepared as they saw fit at the time of application which created high variability in performance of the protective coating. Since the standards were developed, the resulting performance consistency has become increased significantly. Such standards discuss a visual inspection of the steel after an abrasive material has been used to remove scale, rust, and other discoloration soils.

Product Number: 51322-17888-SG
Author: Andrew Recker, Darryl Corbin, Yuxin Zhai
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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There are various abrasive media available for blasting steel surfaces in preparation for protective coating application. Each of these abrasive materials provides not only a surface profile, but a different resulting steel surface condition either from direct embedment of particles and/or changing of the corrosion potential of the steel chemistry. This paper will provide an analysis of the steel surface after blasting with different abrasive media including garnet, coal slag, steel slag, and glass / silica. This analysis includes profile peak density measurements, XPS, polarization resistance, and soluble salt measurements prior to coating application. The scope of the work also includes the use of conditioning or cleaning agents to prepare the steel surface for optimum cleanliness after the blasting process. The coated panels will then be tested with elevated temperature deionized water immersions (NACE TM 0174) and corrosion cell. (Atlas cell) This work will provide insight into some of the variation seen in the field between using different abrasive blast medias that result in differences in coating performance.

There are various abrasive media available for blasting steel surfaces in preparation for protective coating application. Each of these abrasive materials provides not only a surface profile, but a different resulting steel surface condition either from direct embedment of particles and/or changing of the corrosion potential of the steel chemistry. This paper will provide an analysis of the steel surface after blasting with different abrasive media including garnet, coal slag, steel slag, and glass / silica. This analysis includes profile peak density measurements, XPS, polarization resistance, and soluble salt measurements prior to coating application. The scope of the work also includes the use of conditioning or cleaning agents to prepare the steel surface for optimum cleanliness after the blasting process. The coated panels will then be tested with elevated temperature deionized water immersions (NACE TM 0174) and corrosion cell. (Atlas cell) This work will provide insight into some of the variation seen in the field between using different abrasive blast medias that result in differences in coating performance.

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