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Weathering performance of 2-component polyurethane topcoats used in corrosion protection applications, e.g. bridges, marine, stadiums, etc., is discussed with emphasis on some key formulating variables. Variables such as isocyanate index and resin selection are compared in an accelerated weathering study using various polyurethane topcoats. The results are referenced to SSPC polyurethane coating specifications which are often used in the industry to define performance criteria.
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This is the final paper in a series of papers that discusses weathering performance of 2-component (2K) polyurethane topcoats used in corrosion protective coatings applications, e.g., bridges, marine, stadiums, etc., with emphasis on the key formulating variables affecting performance.
This research compares and contrasts NACE TM0115 disbondment test method to ASTM G8, Standard Test Methods for Cathodic Disbonding of Pipeline Coatings...as applied to coatings used in water infrastructure corrosion control.
Thermally sprayed CRA coatings can provide a cost-effective corrosion mitigation method for infrastructure in wet supercritical CO2 at 40°C and 80°C. The scales formed on the steel protected it from further corrosion in 10 MPa and 50 MPa CO2.
Urea–formaldehyde resin was applied to an epoxy coating. The UF resin effectively prevented the corrosive medium from further permeating through to the interface between coating and steel substrate and that the UF resin could significantly reinforce the corrosion protection property.
The purpose of this standard Test Method is to provide guidance on the testing and evaluation of coatings for aerospace applications. This Test Method has been developed for use by researchers, manufacturers, and organizations responsible for the manufacture, specification, and use of corrosion protective coatings for aerospace structures. The Test Method details measurement techniques to continuously monitor the combined environmental and mechanical effects that drive coating degradation in laboratory tests. While for many industries, judgements of coating performance may be primarily aesthetic, this Test Method describes direct, continuous measurements of coating degradation processes that are important to aircraft structural integrity.
Very thick polyurethane coatings are used to provide corrosion protection for water pipelines that must be placed below ground and then may be exposed to ground water. Occasionally there are construction delays and pipe sections remain above ground for extended periods before installation. Under these conditions, atmospheric conditions and exposure to solar UV light cause the coatings to lose gloss and become yellow. These changes can be very obvious and thus raise concerns that the corrosion protective qualities of the coating have also similarly diminished.
Besides economic considerations, ecological and regulatory factors play an increasingly decisive role nowadays in the formulation of innovative coating systems. It is therefore no surprise that the call for zinc-free anti-corrosive pigments or those that do not require labeling has steadily increased in recent years. Zinc-free technology is not new. Numerous pigments based on calcium, strontium, aluminum, and magnesium phosphate have been available on the market for a long time.
Coating systems for protection of threaded fasteners used with structural steel, piping, and equipment intended minimize the effect of corrosion. TG 148
5XXX-series aluminum has been used in multiple naval vessels because it offers excellent strength to weight ratios, weldability and low cost. Although 5XXX series aluminum alloys generally provide excellent corrosion resistance, exposure to moderately elevated temperatures (e.g., solar exposure) results in sensitization due to precipitation of the beta phase (Mg2Al3) at the grain boundaries. The sensitization of marine grade aluminum and subsequent material degradation due to stress corrosion cracking (SCC) and intergranular corrosion (IGC) is a severe problem, causing expensive repairs and out of service time.
Guidelines for the selection and installation of liquid organic coatings to be used over concrete exposed to immersion conditions and severe chemical splash and spillage. Historical Document 1992
While corrosion protection is the primary driver in the selection of protective coatings for a specific project, aesthetics is often a key component for consideration with owners and engineers. This paper will discuss the evolution of generic protective coatings used for exterior aesthetic purposes, focusing on new product developments, improvement in formulations and testing methods that have resulted in improved performance relative to color and gloss retention of finishes for exterior substrates.