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The exposure environment of an engineering material quite often has a large impact on how that material behaves over time. Environments are distinguished by differences in meteorological patterns, geography, salinity, Ultraviolet (UV) radiation, etc1-3. Thus, the degradation of various materials scales proportionately to the characteristics of the exposure site, with more severe sites leading to worse degradation. Developing an understanding of how the local environment impacts the corrosion rates of metals and the deterioration of anti-corrosion coatings is critical for informing asset maintenance schedules and lifetime predictions4.
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Aluminum (Al) alloys are the most common non-ferrous metals used (approximately 25 million tons per year) and the second most commonly used metal alloy after steel1. Some of the properties of Al alloys that attribute to their worldwide use include lightness, thermal conductivity, electrical conductivity, suitability for surface treatments, and corrosion resistance. Al alloys are also combined with other metals/materials to achieve desired properties for specific applications. Al alloys can be joined to other materials with ease to enhance their combined properties with the following techniques: welding, bolting, riveting, clinching, adhesive bonding, and brazing1.
There are more than 47,000 publicly-owned roadway bridges in Canada.1 Over 25% of these bridges have main structural load bearing components made of structural steel (i.e., truss and steel girder bridges) based on data from the Ministry of Transportation, Ontario – MTO.2 According to Statistics Canada, the condition of approximately 40% of these bridges is rated as either very poor (unfit for sustained service), poor (increasing potential of affecting service), or fair (requires attention).3 It was reported by Koch et al.4 that corrosion is one of the main reasons that lead to structural deficiency of steel components of highway bridges. Especially in marine environments, steel bridges are at risk of high rates of corrosion, particularly beyond 15-20 years in service.5 This observation can be expanded to locations where the use of de-icing salt is common practice such as urban areas in North America. In addition, future climatic changes that are evident (i.e., change in temperature and relative humidity) may potentially affect the rate of corrosion-induced deterioration and affect the resistance of bridges against various load types throughout their life-cycle.
Extensive guidelines have been published for selecting where to search for corrosion under insulation (CUI). The guidelines are based on CUI failures and near misses. Piping CUI inspection programs collect the data outlined as relevant in specific company practices.
Control of corrosion on steel, fixed offshore platforms and oil & gas handling equipment associated with petroleum production. Submerged, splash, and atmospheric zones. Historical Document 1983
Control of corrosion on steel, fixed offshore platforms and oil & gas handling equipment associated with petroleum production. Submerged, splash, and atmospheric zones. Historical Document 1994
Standard procedures for coating test panel selection, surface preparation, coating application, field exposure sites and conditions, and the grading and evaluation of coating test panels. Historical Document 1998
This standard presents corrosion control guidelines that are applicable to existing atmospherically exposed structures made of conventionally reinforced concrete. Historical Document 1998
Corrosion control guidelines that are applicable to existing atmospherically exposed structures made of conventionally reinforced concrete. Historical Document 2006
Selection of coatings for concrete surfaces in nonimmersion and atmospheric services. Chemical properties. Surface preparation. Service conditions. General properties. Testing. Historical Document 1991