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Highly engineered PVDF (polyvinylidene fluoride) based coatings have evolved over the years to meet the specific requirements of market segments. Over 50 years ago, high temperature-baked PVDF based finishes were introduced to the architectural community to protect the metal components of skyscrapers, stadiums, and other landmark structures. The multi-decade service life and extreme weatherability of these coatings is attested to by outdoor Florida exposure and demonstrated by performance on structures worldwide.
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This paper will present the results of an inspection conducted in 2007, nominally 20 years after the initial coating application. The inspection showed varied service lives associated with the different coating systems. Some of the systems were in excellent condition after 20 years while others had completely broken down.
Test methodologies for protective coatings of aircraft are analyzed and evaluated in a variety of conditions. Mechanisms and kinetics of damage progression are quantified using in situ measurements of coating system properties.
A five-year coatings research project was initiated by the Pennsylvania Department of Transportation in 1986 to evaluate the performance of an organic zinc rich coating system. The coating system consisted of a moisture cured urethane zinc rich primer, an epoxy intermediate, and an aliphatic polyester urethane finish coat. The system was applied to the Windgap Bridge located in McKees Rocks, Pennsylvania (near the City of Pittsburgh) in 1986 and 1987.
PVDF (polyvinylidene fluoride)-based coatings are recognized by architects as a premium weatherable coating technology. They provide years of color and gloss retention along with corrosion protection. However, PVDF based coatings have been limited to factory-applied finishes on metal since the coatings require high-temperature processing.
The purpose of surface preparation is to get a required adhesion between steel and the coated film. Adhesion is a significant factor for the suitability and life of protective coatings in corrosive surroundings. In the shipbuilding industry, air blasting with round blasting nozzles is common practice for achieving the productivity and proper surface profile. Generally, the round blasting nozzle cannot evenly spread the abrasive material on a steel surface compared with a rectangular nozzle.
Characteristics of the rapid cure non-skid coating systems for the highly stressed area, exposed deck of the marine vessels were studied in order to establish an advanced coating system with higher cracking resistance. Some previous non-skid epoxy based coating systems for marine vessels suffered premature coating failure such as crack and delamination due to the lower fracture elongation of the coating accompanied with higher external stress.
Generic descriptions of a coating material does not always ensure that it will perform in the CUI service. Testing and acceptance criteria will help owners to ensure that specific coating materials can provide service as required in industrial CUI environments. The intent of these test procedures is not to rank coatings, but test and accept coatings for use in specifications for actual application.
The demands of cementitious coatings and repair mortars have never been greater. As manufacturers, contractors, and coatings inspectors we are tasked with providing high performance solutions for new projects, or to breathe life back into failing concrete or steel. With new cement technologies, we can meet and exceed our customers’ environmental and financial expectations.
For the last several decades, polyurethane/polyurea spray-applied elastomeric coatings have gained market acceptance as durable, and long-lasting protective coatings. With the advances of the high-pressure impingement spray equipment technology during mid-to-late 1980’s, fast setting, two component polyurethane/polyurea coatings finally have a fighting chance in the protective coatings market.
Blistering is a common failure in marine coatings that can be caused by both physical, such as osmotic pressure and temperature gradients, and electrochemical forces like cathodic or anodic polarization. This paper/presentation will start by discussing the various mechanisms that lead to coating blistering, how blisters form, and how to prevent them.
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.