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Aluminum alloys are widely used in engineering structures and components due to their light weight and excellent mechanical properties. However, the alloying elements which contribute to the good mechanical properties also make the alloy prone to localized corrosion. One of the most common and economic approaches to protect Al alloys from corrosion is to apply coatings as protective layers. For example, powder coatings and magnesium-rich primers (MgRP) are both widely used for the corrosion protection of Al alloys.
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This paper describes the results of a research study to determine the effectiveness of various rehabilitation materials and techniques for concrete bridges. This work reflects the needs for identifying effective materials and techniques to offer protection against corrosion of steel in concrete as well as patch repair in concrete girders.
Throughout both commercial and military industries there is a growing need for environmentally safe and cost-effective solutions capable of removing paint and coatings from a wide range of surfaces including steel, aluminum, concrete, and composites. Atmospheric Plasma Coating Removal (APCR) is the next generation of coating removal and surface preparation technology that represents a step forward in developing more environmentally responsible methods for coating removal.
In some quarters of society there is a public outcry regarding the significant corrosion, coatings deterioration and safety concerns associated with North American bridges. Against this backdrop, this paper describes the application more than 20 years ago of an innovative coating system for the rehabilitation and lead abatement of a major truss bridge superstructure in Alberta, Canada.
The DoD functions under a wide array of infrastructure to include, but not limited to, ships, tanks, combat vehicles and buildings. Due to the nature and need of the building materials, these are always at risk for corrosion, causing the infrastructure to literally crumble. This obviously puts Soldiers in harm’s way due to issues such as weapon misfiring and structural failures.
Selecting the most appropriate protective coating system for the Dallas Cowboys Stadium structural steel package that would result in maximum aesthetic properties while addressing any issues relating to color selection, production schedules, and other field issues generally encountered in large construction projects
A new software system has been developed to allow a plan to be created for the inspection tasks associated with the coating processes for a steel structure. This system uses a coatings library to create the coating systems that are to be applied to various user-defined zones of the structure. These zones are identified on a schematic drawing of the structure and then the coating systems and inspection regimes that are required can be associated with these zones.
The California Department of Transportation Chemical Testing Laboratory conducted a 5-year corrosion study evaluating the potential effectiveness of using a single component High Ratio Co-Polymerized Calcium Sulfonate (HRCSA) coating to address pack rust and crevice corrosion on the State’s structural steel bridges.
Using a polyurea elastomer coating system, a Midwest water filtration plant extended the design life of its filters by correcting problems emanating from water leaking through an existing epoxy coating system and concrete substrate.
Two component polyurethane coatings are used in a variety of applications including industrial maintenance. These coating systems were introduced in the 1970’s primarily as topcoats; characterized by their excellent weatherability, toughness, and chemical and stain resistance. When formulated as ambient cured systems, traditional two component polyurethanes typically sacrifice cure time for pot life unless plural component application equipment is employed.
Most capital projects in the energy market face significant cost overrun issues. There is a real need for innovation to improve productivity; reduce the need for completion on site and to minimize the annual operations maintenance budget. By optimizing the coating specification, we can increase the likelihood of paint completion during the project while increasing productivity and quality.
Of the most severe operations in the oil and gas industry are operations under high pressure and high temperatures where pressures and temperatures exceed 1000 psi and 212°F (100°C). Such operations may contain a variety of chemical constituents such as CO2 and H2S gases, hydrocarbons, and water. To address corrosion issues, materials engineers look into either upgrading to expensive alloys or use protective coatings.