Failure Analysis of Fuel System Assemblies |
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Authors: | Melissa Kurtz |
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Affiliation: | (1) Stork Technimet, Inc, 2345 S. 170th St., New Berlin, Wisconsin 53151, USA |
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Abstract: | Fuel system assemblies used on recreational watercraft failed after a short time in service in a seawater environment. Examination
of the assemblies revealed significant degradation of the polyacetal connectors of the wire subassemblies. Optical and microscopic
evaluations indicated the complete loss of connector material implying decomposition of the resin, along with mud-cracking
and a rough surface morphology signifying chemical attack. An elemental analysis performed on both an intact connector and
degraded connector suggested a potential chemical agent in the form of zinc chloride. At elevated temperatures, concentrated
zinc chloride solutions are known to decompose polyacetal resins. The source of the zinc chloride was established as corrosion
products that resulted during the dezincification of the internal brass connector through exposure to saltwater in the application. |
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Keywords: | corrosion failure analysis plastics |
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