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Third Generation Polysiloxane (TGPS) ambient curing CUI mitigation coatings have been used in the petrochemical industry for over five years since the “third generation” concept was introduced at NACE Corrosion 2017. These coating technologies have demonstrated positive results in both shop and field application for asset management in elevated temperature, cryogenic and cyclic applications across -196 to 650o C/ -321 to 1200o F operational temperatures. TGPS coatings have also demonstrated effective use of a two-step (primer-insulation) CUI mitigation coating approach operating up to 400o C/750o F, when compared to the traditional (CUI coating-fibrous insulation-cladding) systems.
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An effort was executed, to leverage the inherent benefits of polysiloxane coatings, to investigate, to assess or develop, and to implement an effective corrosion stain remover in the Navy with the focus of reducing both maintenance costs and time.
Polysiloxane is an inorganic compound with stability vs. organic compounds. Inorganic formulation, elevated temperature polysiloxane coatings for CUI mitigation, true air dry, weather resistance without baking, ultra-high-build spray-on insulation.
Laboratory testing of polysiloxane based materials confirms much higher temperature tolerances than acrylic spray-on products and insulation performance nearly equal to traditional block, batt and mat-type insulation materials.
This standard covers the requirements for a high-performance, one- or two-component, UV-stable polysiloxane topcoat that provides excellent color and gloss retention. Coatings meeting the requirements of this standard are generally suitable for exposures in the following environments: exterior, normally dry, frequently wet by fresh water, frequently wet by seawater, and chemical atmospheric exposure, pH 5-10. The specified coating is intended for application by brush, spray, or roller. It is generally applied over a compatible primer or intermediate coating.
Polysiloxane (often referred to as ‘hydide coatings’) products have been one of the major technology platforms used in the European offshore sector mainly due ban on isocynate among several customers. The potential long-term performance of polysiloxanes coatings have also been a strong argument for this topcoat selection in NORSOK (501 – rev 5) systems. There have been several claim-situations with delamination in epically two-coat systems, but similar problems have also been seen on traditional NORSOK systems.
Corrosion is one of the leading maintenance costs across the United States Surface Navy, with approximately 25 cents of every dollar spent on maintenance going towards fighting or correcting corrosion. In addition to the huge financial burden, corrosion can limit the ability of our Navy’s ships to meet operational commitments and even prevent them from achieving their expected service life (ESL).
A new patent-pending resin technology incorporated into the epoxy/polysiloxane part A portion of a two-component coating system, using an amino-silane curing agent, has shown significant improvements in flexibility, gloss and color retention. Corrosion resistance and adhesion to non-sandblasted metal substrates have also shown improvements. The new resin technology may be considered for low-VOC and HAPs coating systems.
Bridge coatings have evolved significantly over the years, which has led to wide array of coating types for the bridge coatings community to choose from. This paper will briefly discuss the evolution of bridge coatings through time and will also discuss the most current systems deployed in the coating of structural steel bridges. The primary focus of this paper will be centered on one of the newer technologies available, polysiloxane.
Organic modified polysiloxanes are generally recognized as the newest generic class of high-performance protective coating. They have gained commercial acceptance over the last ten years and are now widely used in new construction, heavy duty OEM, marine and industrial maintenance painting. This paper provides an overview of the technology, describes the available types of polysiloxane modified organic coatings and their properties and briefly discusses some recent advances in the field.
Silicone alkyds have been utilized by the Navy for over 50 years and remain the only single-component technology that is qualified under MIL-PRF-24635. Although the predominant coating in the Fleet, silicone alkyd coatings continue to provide poor color and gloss retention, poor chemical resistance, low hardness, slow cure times and limited cleanability to running rust.
Silicone alkyds are single-component (1K) systems and do not require the mixing of components before application. These systems are easy for sailors to apply (via brush or roll), have an indefinite pot-life in a closed can, and will cure under harsh marine conditions, which are why these coatings have been utilized on the exterior topsides of Navy surface ships since the early 1960s. However, these “user friendly” coatings provide limited color and gloss retention, limited resistance to shipboard hydrocarbons, and limited resistance to staining from running rust and soot.