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This paper summarizes the problems encountered by manufacturers and end-users relying on the available standards for materials and performance tests for zinc-rich coatings in today’s industry and presents some suggestions for improving them. The reasons and the need for developing new and only performance based specifications are also explained.
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Microbiologically Influenced Corrosion (MIC) is an important degradation mechanism for materials in civil infrastructure. Recent findings in Florida showed severe corrosion of submerged steel bridge piles associated with microbial activity. Furthermore, heavy marine growth (i.e., tunicates, hydroids, barnacles) was observed on the steel piles, which was also thought to affect the corrosion process by creating oxygen concentration cells and causing the initiation of localized corrosion.
Accelerated corrosion test methods are regularly utilized in coating industries to predict the performance of coatings in real life exposure. The performance of coatings in these accelerated tests is a key step in the product development cycle. It is essential to understand different factors that may introduce variability in the test result.
Vinyl coatings have long been used in the hydro industry for steel structures. As VOC regulations and product availability have changed, owners have moved toward alternative technologies to replace those systems. The intent of this information is to understand the status of vinyl technology, identify and discuss other systems that have historically been used as an alternative, and to review the possibilities of new technologies for these applications.
A newly developed two-component zero VOC water based epoxy topcoat, based on a solid epoxy resin dispersion cured with modified amine, offers comparable performance to solvent based and high VOC water based epoxies and exhibits good corrosion and chemical resistance. The performance properties of the new innovative zero VOC water based epoxy topcoat are reviewed and compared to solvent based and high VOC water based epoxies used in industrial maintenance applications.