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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.
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Pull-off adhesion behaviors of 15 coating systems in three groups were studied utilizing test method ASTM D4541. Three groups of coating systems included coating systems with organic or inorganic zinc-rich primers, polymeric polyurea coatings, and overcoating systems applied on an existing coating system.
This AMPP standard provides a series of effective and economical test methods to evaluate the performance of candidate offshore platform new construction and maintenance coatings. The testing protocol is established to simulate the offshore environment and based on the major failure modes observed on offshore platforms. The test results will rank the candidate coating systems for end-users to select and coating manufacturers to develop reliable coating systems.
Alkyds, the much-trusted coatings of the past were summarily replaced by the superior performance of the polyurethane coatings. The polyurethanes were then supplemented by the polyurethane with clear coat and the polyurethane with UV protector. These coatings promised a twenty-year life and resistance to fading. But now, those coatings are being challenged by the newcomer on the block, the ultra-high performance coatings which are promoted to perform well for up to thirty years.
The Minnesota Department of Transportation (MnDOT) with KTA-Tator, Inc. (KTA) conducted a one-day seminar on Bridge Maintenance Painting Strategy & Project Design in May 2013. One outcome of that seminar was the realization that MnDOT needed a more uniform method to rate the condition of coatings statewide during the biennial bridge safety inspections and a process to select and prioritize maintenance painting strategies. MnDOT assembled a Technical Advisory Panel to address these needs and launched a multi-objective study from October 2013 through June 2014.
Thermal Imaging, or Infrared Thermography, is an evaluation technique that has been used in the general construction industry for many years. Often times this is used to evaluate the degree of heat loss in a structure for insulation purposes, or for detecting water leaks behind a closed wall area. Some recent cases have also shown this technique applicable for testing strength of concrete structures.
Industrial and marine protective coating systems are most commonly applied without incident and perform as expected over their anticipated service life. However, occasionally, a coating system will fail prematurely, for unexpected reasons, and with expensive consequences. This paper addresses those unexpected failures and provides reasons and remedies for such occurrences.
Current and future coating restrictions that reduce atmospheric emissions as well as the potential for the leaching of chemicals into drinking water systems are pushing tank owners and/or specifiers towards the use of 100% Solids by Volume (SBV) coatings. A majority of these high solids coatings whether epoxy, polyurethane, or polyurea, can or should be and in some instances must be, applied using Plural Component (PC) spray equipment.
Fabricators and Construction Firms rely on sub-tier vendors to supply a vast array of components and equipment for integration into the products they are supplying their clients. This may include valves, engines, motors, power supplies, tanks, tubs, vessels and other numerous items. The items and components provided by sub-tier vendors are normally prepared and coated prior to being delivered with what are typically referred to as original equipment manufacturer (OEM) coating systems.
Over the past decade, coating manufacturers have made significant strides in the formulation of new products, utilizing new polymers and enhanced pigments that produce improvements in weatherability, corrosion protection, and ease of application, while improving compatibility with existing coatings, and offering enhanced physical, and thermal resistance. However, coating product data sheets typically portray anticipated coating performance under favorable laboratory conditions that may not reflect actual field conditions during surface cleaning and application operations.
Corrosion on steel bridges has long been recognized as a major concern. Over the years, technology has advanced from lead-based paints used for a century to three-coat systems. Recently, two-coat systems have been developed and are gaining acceptance. Research which is now underway to develop a one-coat system is described in this paper, along with the results of the Phase 1 testing which has been completed.
Marine coating systems installed aboard commercial and military vessels are exposed to extremely aggressive environmental conditions during maritime operation. A key element in prolonging the useful life of any ship, both commercial and military, lies in the selection and installation of cost-effective corrosion control methods and materials at newbuild.