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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.
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.
When it comes to a bridge structure with a serviceable Organic Zinc / Epoxy / Urethane (OZ/E/U) coating system, there is no golden answer on the most cost-effective maintenance painting strategy. Depending on the severity and amount of corrosion and coating breakdown on the structure, planned maintenance surface preparations range from spot power tool cleaning and spot painting to a full SSPC-SP 10 media blast and full recoating operation.
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The role of a Coating Inspector has evolved considerably over the past few decades, and the responsibilities have increased over what used to be a rather straightforward job: to verify that surface preparation and coating application meet the project specification requirements. Today there are week-long or multi-week basic and advanced coating inspection courses, specialty courses that are industry-specific (e.g., bridge, nuclear), courses that are substrate-specific (e.g., concrete coatings inspection) and even coating-specific (e.g., inspection of thermal spray coatings).
In oil refineries, one corrosion issue occurs each week worldwide that leads to a severe incident such as sudden leakages, e.g., resulting from pipe ruptures.[1] These facts emphasize the need for corrosion control in refineries. Corrosion monitoring is one important approach to utilize and can maximize equipment integrity and productivity.