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This paper proposes to identify the differences in chemistry between the two types of OAA and the potential shortfalls in the use of each type under practical working conditions. It will also highlight the proven benefits of these additives in service.
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This paper describes the performance properties of coconut-based polyol resin used in polyurethane coating systems compared with commercially available polyurethane paints which use petroleum-based acrylic or polyester polyol resins, in terms of physical and corrosion properties under accelerated laboratory weather conditions. The studies also show the chemical resistance and protection properties from the discoloration effects of ultraviolet (UV) light on the painted metal test panel substrate specifically cold rolled steel.
The State of Florida spends millions of dollars to mitigate corrosion and paint existing bridge structures each year. Since tourism is a big contributor to the State’s economy, it is of high importance to maintain these structures in a condition that is pleasing to the eye in order to provide a pleasant welcome for visitors to the Sunshine State.
It was requested that exposure testing be completed on various high durability coatings products to evaluate gloss retention and color changes. Various systems were chosen to test, some with clear coats and some without. They were placed in cyclic UV/condensation testing, concentrated natural sunlight testing in Arizona, and outdoor exposure testing in South Florida.
Utility scale solar array construction projects continue to grow in number annually. Large open spaces with consistent UV exposure often make excellent locations for solar array fields, however these sites do not always provide ideal soil conditions for the steel H beam pile supports which are embedded into the ground.
Due to their excellent performance properties, epoxy coatings are commonly used over metal and concrete substrates in applications where corrosion protection and chemical/solvent resistance are key requirements. One weakness of these epoxy coatings is their poor UV durability. Epoxy coatings typically have poor gloss and color retention as well as poor resistance to chalking on exterior exposure.
Epoxy-based coating used in the ships and marine structures can be quickly degraded after only a short period of exterior exposure. The weathering defects such as discoloration, chalking and gloss reduction are originated from a photo-oxidation of aromatic group in the epoxy resin under the UV light. Weather resistance coatings such as polyurethane and polysiloxane require more work due to the short over-coating interval and low compatibility with primer coating layers.
Low solar absorbing (LSA) attributes are important for marine decking materials. Reduced solar heat absorption can not only improve the condition of living and working spaces beneath any deck, but also help protecting electronics and equipment. This article will review current LSA technologies and present a study on how to improve the solar reflectance and weather resistance of epoxy marine decking.
This paper summarizes a coating application to a diver’s barge and field performance evaluation process for a system that prevents quagga mussels from attachment. The coating system utilizes two separate manufactures for the one system on the immersion side, combined to create a non adhering quagga mussel barrier coating.
NACE TM0177 Method D corrosion test is used on low alloyed steels in sour environments. A DCB testing program has been performed on 125 ksi grade sour service casings and couplings in 0.07 bar H2S gas for solving these issues and for providing meaningful KISSC values.