Pages: 7 Published: Jan 2005
CORROSION TESTING IN freshwater environments is performed to determine the corrosion characteristics of water, evaluate the behavior of various materials when exposed to water, and evaluate various corrosion mitigation methods. For example, waters in cooling systems are often analyzed to determine how much and what forms of corrosion might occur on a given metal. Screening tests are used to select the most appropriate metal for use as piping material. Various water treatment alternatives can be tested in the laboratory or in a pilot plant. Tests are used to monitor the selected treatment scheme. Laboratory screening tests, detailed simulations, pilot plant studies, and system monitoring are typical corrosion testing methods. In any event, the selection of the appropriate test method will depend on the objectives of the test, details of the system, and the process parameters (e.g., flow, temperature, and chemistry). Test design and analysis are covered elsewhere in this book as well as in the referenced documents. This chapter discusses the causes and types of corrosion common in freshwater systems and the standardized tests used for evaluation. Freshwater can be defined simply as water that is not salty and brackish water is defined by the dictionary as water having a somewhat salty taste. A more quantitative definition of brackish water is water with a salinity between 0.5 and 17 parts per thousand  (Ref ASM Materials Engineering Dictionary, J. R. Davis Ed., ASM International, Materials Park, OH, 1992). Then freshwater can be further defined as water with a salinity less than 0.5 parts per thousand. For the purposes of this chapter, freshwater systems include potable water, heating/cooling, condensate, rivers, streams, and lakes.
Paper ID: MNL11037M
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