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General Dynamics NASSCO proved that by modernizing its facilities and changing its operations it could build ships similarly to the industry leaders in Asia.
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The surface properties of metals can be modified by using thin hybrid coatings without changing the metallic look of the surface. These properties include for example anti-fouling, abrasive resistance and corrosion resistance.
Surface layers often form on carbon steel surfaces in carbon dioxide (CO2) saturated environments and under certain conditions can offer corrosion protection to the underlying steel. One such layer, magnetite (Fe3O4) is a semiconductor, having a reported electrical resistivity of the order of 10-2 to 10-1 Ω∙cm and band gap of 0.1 eV. The conductive properties of Fe3O4 are of significant importance when understanding the corrosion behaviour of carbon steel, as Fe3O4 can readily establish a galvanic couple with the steel surface upon which it has formed.
This paper describes the recoating of the interior primary and secondary structural steel of an atmospherically exposed building that houses a solid waste transfer station. The basic chemistry and the benefits of moisture cured polyurethane coatings in cold and humid climates are discussed.
The moisture assessment was determined by using a combination of 4 different methods rather than using one single method. On previous projects, the consultants had experience with the inaccuracy of some of the methods.
Thermally insulated pipelines have wide networks globally that are used to transport various chemicals, hydrocarbons as well as steam. CUI (corrosion under insulation), external SCC (stress corrosion cracking) and corrosion fatigue are some of the prominent damage mechanisms which may occur on the external surface of insulated pipes/ pipelines that in turn jeopardize the long-term integrity and operations. The moisture is undoubtedly the key contributor behind the above said external degradations of metallic surfaces and can come under thermal insulations via seepage and/ or condensation. Various factors that influence the extent of moisture intrusion are the design of insulated system(s), type and age of insulation, operating temperature of pipeline(s) as well as environmental and neighborhood conditions.
The presentation will help attendees understand the testing and coating requirements for concrete floors and walls with moisture issues.
Moisture testing of concrete substrates has become a common practice in the floor coatings industry. Even though most contractors and field technicians are capable of performing the testing, they don’t really understand what the data they are collecting means, other than the acceptance criteria established by the product manufacturer of the coating or flooring being installed.
The importance of moisture testing of concrete floors cannot be stressed enough. Moisture is a leading cause of coatings failures on concrete floors. There are many ways moisture can affect floor coatings on concrete. Moisture testing alone is not sufficient enough at detecting all of the potential problems. Inspecting a building prior to performing any tests will provide a much clearer picture of the potential problems moisture in both liquid and vapor form can pose.
The moisture vapor emission rate (MVER) of concrete floors affects the selection of flooring materials for both new construction and remodel projects. The MVER is determined by exposing a 20” x 20” test area to calcium chloride for 60 to 72 hours.