In a cooperative project between industry and research institutes, local wall shear stresses at corrosion coupons tested in rotated cages were quantified for the first time via electrochemical measurements at microelectrodes flush-mounted in dummy coupons at characteristic surface sites (leading edge, trailing edge, outside surface). The tracer system was the hexacyanoferrate(II/III) redox couple. Besides geometric parameters the influence of medium parameters (density, viscosity) was investigated. It is now possible to link cage test data to actual service flow conditions and make application-specific use of the advantages of rotated cage experiments.

Subject
Electric current, External surfaces, Viscosity, Geometry, Microelectrodes, Diffusion, Metal coupons, Wall shear stress, Liquids, Internal surfaces, Corrosion coupons, Electrodes, Coupons
Keywords:
Flow induced localized corrosion, erosion corrosion, rotating cage, wall shear stress
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2004
Association for Materials Protection and Performance (AMPP)
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