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The following describes some equipment and practices used for cleaning and painting the variety of substrates found on commercial stores: concrete masonry units (CMU), precast and tilt-up panels, steel awnings and canopies, Exterior Insulation Finish Systems (EIFS), and polycarbonate. Many contributing factors can create either a fairly straightforward and simple process or a very complex project.
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Inorganic zinc (IOZ) silicate coating was previously applied to partially fabricated low alloy, 21/4 Cr-1MoV, high temperature, hydrogen, reactor vessels for long-term storage corrosion protection prior to final welding and post weld heat treatment (PWHT) at 690-720°C (1274-1328°F). The need for complete coating removal to mitigate the known embrittlement and weld cracking that can occur after welding and PWHT led to the development of a novel, environmentally friendly method to remove IOZ to trace levels below 1 ppm.
Protective coating systems provide the primary corrosion protection for assets in sea water. Protective coating systems are defined as a specific combination of surface preparation and coating material applied under specified conditions to a specific structure. Over the past many years, the paint industry has focused considerable resources toward the formulation, performance testing and fine tuning of coatings materials.
In this paper failure analysis methodology will be applied to the principal mechanisms by which paints and coatings fail during service; with specific application to case studies involving T&D pipelines and utility structures. The case studies will apply standard failure analysis techniques to determine the primary causes and modes of failures.
Polarization measurements were conducted over a 21-year period on bare and coated steel "H" pilings 6 inch by 6 inch by 30 feet (15.2 cm by 15.2 cm by 9.1 m) installed in seawater. A DC power source was used to shift from the corrosion potential of each pile to -0.85V. The amount of potential shift was recorded as 6V. The current (6I) required to shift the potential was measured, and a nonlinear pseudoresistance (6V/6I), called the Cathodic Protection Index (CPI), was calculated. The CPI was compared with the coating condition of the steel pilings as determined visually using ASTM standards. Results of these tests will be presented and discussed.
You’ve worked diligently to build your online presence: your website; your social media strategy and profiles; and your search engine optimization (SEO). You can be found on the web for sure — but is all that content positive and reflective of your efforts?
It does not take one with too much intelligence to note that our infrastructure is in dire shape. Not only does this include our water & wastewater areas, but our road and bridge systems need substantial help. Deterioration due to environmental issues, water and chemicals that are used which cause for serious corrosion and erosion concerns. Over the years, a variety of methods have been employed to help with these issues, but all have individual characteristics and problems.
Soluble salts may be transferred to a steel bridge or other structure as an airborne aerosol (generally from marine or industrial sources), wind-blown debris, and debris transferred from vehicles. Perhaps the most significant source of soluble salts on bridges is from de-icing materials. Once on the structure, salts may become incorporated into corrosion scale, poultice, or crevices.
A new era of natural gas exploration is spreading across the continental United States and Canada. Through a technique called hydraulic fracturing (fracking), huge deposits of oil shale, like the Marcellus and Utica deposits that extend from the Appalachians and into Canada, are now producing enough gas to meet North America’s needs for the next 14 years. The boom in gas exploration has opened up new markets for pipeline and joint coating materials to provide corrosion protection.