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High pressure (HP) and ultra-high pressure (UHP) waterjetting for coating removal and surface preparation has several advantages compared to the industry standard abrasive grit blasting process. However, a major drawback of waterjetting is subsequent flash rusting of the steel surface. The color of the flash rust is typically orange, red, or brown of various shades depending on the color of the underlying steel, the nature of the surrounding environment, and the duration of exposure to the environment.
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Stress development in epoxy coatings applied in water ballast tanks (WBT) on ships can lead to cracking, corrosion, and failure of ship’s hulls, with catastrophic consequences to the environment as well as loss of seamen at sea. Typically, these cracks do not appear during application and curing of the coating but after some finite time of service. The financial wellbeing of the ship’s owner can suffer greatly. To avoid such cracking, it is critical to have a clear understanding of the underlying mechanisms and primary controlling factors behind the coating cracks.
Phenalkamine curing agents for epoxy resins provide an outstanding anticorrosion protection, fast and low temperature curing, high surface tolerance, large overcoat window and low VOC formulations.
Improved holiday detection of new coatings can increase a coating’s service life. This paper describes development of a fast, compact and portable holiday detector based on imaging of fluorescent coatings that is designed for ballast tanks inspection on Navy ships.
Vapor resistance properties of architectural coatings that are used on or within an exterior wall can directly influence the moisture performance of the assembly. Through the use of computer modeling, the effect that various coating applications have on common exterior wall assemblies are studied using varying indoor and outdoor climatic conditions.
Coatings maintenance projects are typically scheduled and selected based on ASTM rust grade, service environment - corrosion rate, coating condition and project visibility or aesthetics. There is something missing. That something is a risk-based assessment. This paper will demonstrate how to make a risk grid and accommodate this into condition assessment criteria for prioritizing and scheduling painting projects.
Over the past few decades, dramatic technology shifts have occurred in the coatings industry. Rapid changes in pigments, resins, and solvents have helped make environmentally friendly coatings possible; however, such changes have also created many technical hurdles.
A new family of low viscosity MDI-based isocyanates has been developed for use in two component compositions for primer and protective coating applications. This new family of products shows excellent adhesion to a variety of substrates including concrete surfaces and wood. The products can be effectively applied on wet surfaces and compared to earlier products, have extended pot lifetimes.
There are a wide variety of materials and techniques available for protecting metal roof decks. Each of these technologies presents specific problems and challenges. This paper will provide an overview on the use of polyurethane hybrid thick-film-coatings in direct to metal roofing applications and how the unique chemistry and physical properties of these coatings allow them to address some of the key failure issues associated with alternative roofing materials.
This paper introduces a novel method for chemical surface preparation of concrete surfaces that has been recognized by ASTM under a recent revision of ASTM D4260. Contractors will learn current methods used to prepare concrete in order to receive coatings.
A newly developed one-component waterborne polyurethane dispersion (PUD) topcoat, with VOC below 200 G/L, offers exterior durability, color and gloss retention and chemical resistance comparable to two-component solventborne and waterborne polyurethane coatings.
In the 1990s, military assets transported shipboard to overseas locations by the U.S. Army arrived at their destinations already corroded due to saltwater. In response to this problem, U.S. Army Tank-automotive and Armaments Command (TACOM) began manually applying spray-on corrosion inhibitor (CI) to assets prior to transportation and realized a significant reduction in corrosion. However, due to an increase in the volume of military assets being transported overseas, manual application of CI soon proved too time-consuming and costly.