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Bridge Owners are always on the lookout for a coating system for steel bridges that will perform for the longest time, and at a reasonable price. Metallizing has long been considered one of the best coating systems but the lack of qualified applicators simply has not made it available as an economical option. The success of early metallizing encouraged the investment in metallizing for Owners and bridge fabricators, and spurred on its significant growth over the past decade.
The use of metallized coating on bridges in New Hampshire years ago was limited to small special strategic steel locations. The metallizing option was severely limited by lack of shop applicators. Rhode Island pioneered duplex metallized bridges, research, and interest. The past two decades have seen a rapid growth of industry facility investment for application and Owner selection of the metallizing coating. This paper presents signature New England bridges and several New Hampshire bridges with metallized coating representing the growing popularity of thermal spray coating for steel bridges.
Copper alloys such as copper nickel (CuNi) and Admiralty Brass (CuZn) are often successful material selections for seawater coolers. The copper alloys successes in these highly corrosive environments can be attributes to the ability of copper to form a protective scale, thus stopping corrosion of the material. On copper alloys in seawater, the protective scale formed comprises a mix of cuprous oxide (Cu2O), copper oxide (CuO) and copper hydroxy chlorides.
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Many industrial processes contain H2, CO, CO2, and H2O gas mixtures, such as syngas production and processing in hydrogen, ammonia, and methanol plants. These process environments have high carbon activity, i.e. ac > 1, and low oxygen partial pressure at their elevated operating temperatures, such as in the temperature range of 400-800 °C (752-1472 °F). The high carbon activity could result in a catastrophic material degradation, i.e. metal dusting. The resulting corrosion products consist of carbon or graphite and metal particles, along with possible carbides and oxides, and cause material disintegration.
Cemented carbides have been widely used to make parts for wear applications due to the excellent combination of hardness and toughness. Cemented carbides represent a group of composite materials containing hard metal carbides, such as tungsten carbide (WC), bonded by ductile metallic binder agents, such as cobalt (Co), nickel (Ni), or iron (Fe).1 By varying WC grain size, weight fraction of metallic binder, and processing parameters, a wider range of microstructure and mechanical properties can be achieved.