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Pre-construction Primer (PCP) is a zinc-containing, weld-through primer applied at low thickness to minimize rusting of steel during storage and fabrication. PCP removal is perceived to reduce risk of coating failure associated with painting over an aged zinc primer. PCP is retained in many commercial shipbuilding operations in order to reduce costs and provide a better performing coating system. This paper will review commercial industry practices and the guidance provided by marine coating manufacturers.
Truly self-healing materials have the capability to repair themselves when they are damaged without the need for any external intervention. Self-healing systems based on microencapsulated healing agents developed by researchers at the University of Illinois at Urbana-Champaign were initially developed with polymerized resins and reinforced polymer composites as the intended applications. In this paper, we discuss the principles that emerged in the design of these self-healing systems and how they are presently used in design and optimization of self-healing systems for industrial and marine protective coatings.
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This paper will focus on the advancement of waterborne acrylic coatings that features self-stratifying technology which significantly advances performance of color and gloss retention. Various analytical methods were used to verify stratification. Magnified cross sections of the coating film will show the layered effect and discussion of how these multiple micro-paint layers outperform standard acrylics. An overview of performance testing will be presented to demonstrate the value of this technology and how it contributes to longer lifecycle costs and lower overall project costs.
Coating technologies for bridges has not changed much since 1977. Available finish coat technologies were limited to alkyd, acrylic, or urethane-based chemistry. Performance of these chemistries has declined over the years due to cost reduction in paint to meet project pricing requirements. Bridge owners and engineers have had a limited selection of high-performance coatings to protect their assets. This is even more important with high profile structures where the finish coat needs to stand the test of time and limited maintenance funding has forced asset owners to extend time in between cosmetic maintenance