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This paper presents an overview of systems available in the market today, their health and safety characteristics, performance capabilities and delivery mechanisms. Installation technologies are analyzed on their energy efficiencies, environmental impact, performance result consistency, ease of use and cost. The goal was to identify currently available systems; analyze concerns and limitations with these systems; and provide a basis for material selection and installation practices to achieve long-term expectations; while maintaining the utmost protection of humans, animals and the environment
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Many common topcoat standards used for architectural and protective coating applications (e.g., MPI 311, SSPC-Paint 36) include a durability requirement based on the accelerated weathering performance of a white coating. However, there are currently no standards for field-applied coatings which address the needs of specifiers who want to ensure durable color performance in high chroma (saturated, or bright) colors, e.g., Safety Red.
Industry constantly seeks improved methods to evaluate protective coatings. In immersion service, protective coatings act to reduce electrochemical activity at the metal/coating interface. Tracking this activity via the use of segmented panel testing appears to offer additional insight into coating performance that may aid in coating design and predicting longer-term performance.
Focusing on the invention of new measurement methods in order to analyze hull coating efficiency more precisely is one approach. However, it is possible to treat performance data from in-situ observations carried out at specified intervals onboard any vessel (over 10,000 dwt) by means of a data collection protocol.
Many challenges face today's coatings specifiers in selecting high performance coatings and linings. New formulations are being developed to meet changing performance needs and also future VOC requirements. Evaluation of these "new" coatings and linings can be difficult. It is the purpose of this paper to look at past, current and future coating evaluation methods in order to develop a testing protocol that can be used to assist in the selection of high performance coatings and linings for wastewater environments.
Solution vinyl resin coatings are an effective coating system that have been used on raw water hydraulic steel structures since the 1940’s, including many of the nation’s hydroelectric and lock and dam facilities. The high performance of the vinyl coating is at the cost of releasing high amounts of volatile organic compounds into the air. This study evaluates polysiloxane coating systems as greener alternatives to solution vinyl systems.
The success of corrosion protective coating systems relies, to a great extent, on the coatings’ inherent barrier properties. This barrier property signifies the coating’s ability to withstand the permeation of sea water and oxygen, thus minimizing corrosion of the underlying metal. While various additives or pigments can promote the barrier property of coatings, one of the most common pigments is aluminum flakes [1-4].The idea behind their use is simple, and essentially relies on having the aluminum flakes in the coating oriented parallel to the underlying substrate. With them in place, the pathways for sea water and oxygen effectively increase, thus preventing the progression of corrosion. However, while having been employed in numerous coating formulations for many years, the evidence for the success of aluminum flakes as barrier pigments is still lacking.
Selecting the most appropriate protective coating for the exterior of steel wind towers involves balancing the variables of production and protection to maximize profitability. The coating solution that maximizes production and protection while realizing a profitability that is equal to or greater than owner expectations is an organic zinc-rich epoxy primer and polyaspartic urethane topcoat.
This paper will cover cathodic disbondment, dry film thickness, peak height and coating evaluation for failures.
In this paper failure analysis methodology will be applied to the principal mechanisms by which paints and coatings fail during service; with specific application to case studies involving T&D pipelines and utility structures. The case studies will apply standard failure analysis techniques to determine the primary causes and modes of failures.
Rapid return-to-service, improved coating durability, and environmental concerns are major driving forces in today’s coating landscape. Coatings that are easier to handle, dry-faster, and last longer provide benefits that speed operation efficiencies and improve overall costs. Ambientcured coatings available today, that offer fast cure and weatherability, include polyurethanes, polyaspartics, waterborne acrylics, and polysiloxanes.
Performance, cost, and safety drive the coatings industry. Safer and environmentally friendly coatings continue to be a hot topic of discussion globally; however, the adoption of greener coating technologies is slow, especially in the US. This could be attributed to many factors, but from the formulator's perspective, performance is key. Waterborne coatings have been used in architectural applications for decades, but typically these coatings are valued mostly for aesthetics, ease of use, and low cost.