Corrosion of high‐velocity oxy‐fuel (HVOF) sprayed iron‐based amorphous metallic coatings for marine pump in sodium chloride solutions

Passivation Pitting Corrosion Ribbon
DOI: 10.1002/maco.201106211 Publication Date: 2011-08-09T09:23:08Z
ABSTRACT
Abstract FeCrMoMnWBCSi amorphous metallic coatings (AMCs) were deposited onto the 304 stainless steel (base material of pump impeller operated in sand‐containing seawater) by high‐velocity oxygen‐fuel (HVOF) thermal spray. The preparation, microstructural characteristics, and static corrosion behavior AMCs presented. microstructure characterized scanning electron microscopy (SEM), X‐ray diffraction (XRD), differential calorimetry (DSC), electrochemical methods. Melt‐spun ribbon also used for comparison purposes. results indicated that can spontaneously passivate with a wide passive region, much higher ability to withstand pitting than high resistance equivalent value. current density was at least two orders magnitude counterpart ribbon, which showed slightly decreased uniform due incompact structure porosity. increased coating thickness concentration NaCl solution. A stable passivation held endowed them suitably marine environments.
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