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Achieving high performance with waterborne acrylic latex DTM coatings often requires a balancing act to be performed by both the polymer scientist designing the latex polymer and the coating scientist formulating the coating. A successful coating is defined by a set of critical properties while in the paint can, during application, and ultimately in its performance throughout its service life.
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This paper examines the authors successful experiences on some simple and very complex projects where both the coatings and environmental requirements were limited to a few pages. Being made up almost entirely of SSPC/NACE and PDCA standards that described “performance criteria” as opposed to being a prescriptive or proprietary type of specification defining what was to be used, when it was to be used and how it was to be done.
This paper will examine the formulation and performance of new, activated zinc epoxy primers compared to conventional zinc-rich epoxy primers. We will demonstrate comparable corrosion resistance at reduced zinc levels in the dried film (Level 3 ≥65%) and show that zinc metal levels can be reduced to as low as 31% by weight without compromising galvanic corrosion protection while improving adhesion and mechanical properties of the dry film.
The subject paper presents updated inspection data from a Federal Highway Administration study of the effect of local environments on the degradation of alternative bridge coating materials. Exposure data covers up to nine years of service in several diverse environments, including sites representative of marine, industrial, and rural service environments. Paint deterioration is characterized as the result of local atmospheric parameters, time of wetness, and airborne contaminants
The mechanical properties of polymeric coatings are often overlooked because researchers are not aware of how modern instrumentation can now aid them in understanding how a particular product may survive in service conditions. In many applications the two main considerations are aesthetics and durability, both of which can be directly related to the mechanical properties of the base material.
This presentation will focus on the performance and aesthetic issues encountered when painting masonry surfaces. Contractors will also learn how to cost-effectively add color and improve appearance and weather protection to masonry jobs. Objectives of the presentation are education on proper surface preparation, how to select an appropriate coating for a long-lasting finish and new coating technology.
Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain.
To determine how colors change during weathering, ten non-leaded polyurethane colors were exposed to QUV accelerated weathering, Chicago outdoor exposure and Florida outdoor exposure. Color change, percent gloss retention and Aesthetic Ratings were made every 1000 hours in QUV up to 8000 hours, yearly in Chicago exposure for four years and yearly in Florida exposure for three years.
Graffiti has existed since ancient times, with examples dating back to Ancient Greece and the Roman Empire. In recent times, Graffiti has gained widespread visual attention, most of it unwanted. Graffiti vandals may believe that their actions harm no one, yet the reality is that their work invites gang violence and a sharp decline in property values.
Test specimens, methods, and equipment have been presented that will be used for the development of a representative, accelerated test protocol to accurately reproduce multi-layer coating failure modes resulting from the combination of environmental and mechanical stressors.
Corrosion on steel bridges has long been recognized as a major concern. Over the years, technology has advanced from lead-based paints used for a century to three-coat systems. Recently, two-coat systems have been developed and are gaining acceptance. Research which is now underway to develop a one-coat system is described in this paper, along with the results of the Phase 1 testing which has been completed.
Coatings are widely used for highway steel bridges exposed to aggressive environments to extend their service life. Even with the continuous development of coating technologies, steel bridges remain susceptible to corrosion deterioration. Periodic maintenance, that may include coating repair, is required for long term bridge serviceability. Selection of compatible repair coating materials and appropriate preparation of the steel surface are critical parameters for corrosion protection.