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08251 Laboratory Testing of Seawater at Elevated Temperatures With Low Concentrations of Hypochlorite

Product Number: 51300-08251-SG
ISBN: 08251 2008 CP
Author: Sarah Standlee, Killian Efird, and Katherine May
Publication Date: 2008
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Testing a material's corrosion response to a seawater environment at temperatures up to 200°F (93.3°C) with hypochlorite additions up to 10 ppm (part per million by volume) must be done carefully or the results will not be accurate. Hypochlorite thermally degrades rapidly, essentially removing it from the testing solution during the test, invalidating the results. Using potentiodynamic scans and corrosion potential measurements, it is possible to overcome the problem of hypochlorite degradation and determine the pitting and crevice corrosion susceptibility of a material. This paper examines the method and provides examples of its use with several passive metals (UNS N10276, S31603, S31254, and R50400).
Testing a material's corrosion response to a seawater environment at temperatures up to 200°F (93.3°C) with hypochlorite additions up to 10 ppm (part per million by volume) must be done carefully or the results will not be accurate. Hypochlorite thermally degrades rapidly, essentially removing it from the testing solution during the test, invalidating the results. Using potentiodynamic scans and corrosion potential measurements, it is possible to overcome the problem of hypochlorite degradation and determine the pitting and crevice corrosion susceptibility of a material. This paper examines the method and provides examples of its use with several passive metals (UNS N10276, S31603, S31254, and R50400).
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