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Zinc-rich coatings have long been known to provide excellent corrosion resistance in highly corrosive environments, in general,inorganic zincs for new construction and organic zincs for maintenance. A recent trend has been toward zinc-rich coatings with reduced levels of zinc dust. An SSPC committee formed to revise SSPC Paint 29, Zinc Dust Sacrificial Primer, Performance Based, to reference performance only, removing reference to minimum zinc dust level.
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Zinc rich coatings have long been used in the protective coatings industry as one of the primary means of steel substrate protection against corrosion. The primary protection mechanism has historically been galvanic sacrificial loss of zinc metal and the simultaneous formation of protective zinc oxides and salts. Various standards and customer specifications exist to ensure that the coating will provide the necessary corrosion protection for the life of the asset.
Information from inspection and analysis of electric resistance welded galvanized steel pipe after service in residential water systems has resulted in a compilation of observations concerning the development and severity of corrosion leading to failure.
Analysis of a UNS N08800 hydrogen unit preheat tube that failed in service. Based on chemical and metallographic analyses the failure was attributed to liquid metal embrittlement by zinc. The zinc source is thought to be the Cu/Zn catalyst for the low temperature shift converter located downstream of the preheat tubes.
Within a few weeks in a 2012 cathodic protection (CP) trial for monopiled windturbine structures in the North Sea, the seawater pH inside the monopile dropped from 8 to 5 and toxic gas (H2S and CO) alarms were energised. This paper explains why.
A test protocol was developed to provide an assessment of the effects of various film defects as well as to perform post-exposure qualitative and quantitative evaluations on eight different coatings systems.
Arguments to use long-time cathodic corrosion protection with thermally sprayed zinc and zinc based alloys in… based on laboratory tests, results of field tests as well as the monitoring of metalized steel structures in different countries.
Results of laboratory tests of dual-coated (zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies.
Corrosion of reinforcing steel is the most significant cause of deterioration of reinforced concrete structures. Exposure to de-icing salts, seawater and chloride-containing set accelerators can play a significant role in reinforcing steel corrosion. Long-term exposure to carbon dioxide is also cited as a contributor to the corrosion of steel in concrete as well.
On November 1, 2000, the National Football League named the city of Jacksonville, Florida as the site for the 2005 Super Bowl. It wasn’t long before the Florida Department of Transportation was contacted to help the city “spruce up” the Main Street Bridge for the occasion.
Corrosion protection of infrastructure and assets is an area of increasing focus due to increasing financial and safety concerns. On a global scale, corrosion has an annual cost of $2.5 trillion (USD).1 To combat the deleterious effects of this natural phenomenon, specifiers and owners have many choices in terms of materials and protective coatings. Consideration of both initial and life cycle costs has become more important in the age of increased competition and shrinking maintenance budgets.