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03213 ELECTROSPARK DEPOSITED COATING TECHNOLOGY FOR NAVAL APPLICATIONS

Picture for 03213 ELECTROSPARK DEPOSITED COATING TECHNOLOGY
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Product Number: 51300-03213-SG
ISBN: 03213 2003 CP
Author: Denise A. Aylor
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Evaluation of the electrospark deposition (ESD) process suggests that this is a viable in-situ method for repairing small worn and corroded areas on nickel- and copper-base alloys. Metallographic analysis showed metallurgically bonded ESD coatings with no interconnected porosity and microcracking through the coating to the substrate. Microhardness measurements made on ESD Alloy 400 indicated uniformity in microhardness across the coating as well as within the Alloy K500 substrate, substantiating the premise that the ESD process does not alter the microstructure of the base material. Potentiodynamic polarization testing of ESD Alloy 400 and 70/30 copper-nickel showed excellent correlation between the ESD coatings and similar wrought alloys. Crevice corrosion testing of ESD Alloys 625, 59, and C276 indicated no susceptibility for ESD Alloy 59 after 365 days’ seawater immersion. ESD Alloys 625 and C276 were susceptible to crevice corrosion, with maximum depths of attack of 0.011 in. (0.28 mm) and 0.009 in. (0.22 mm), respectively. Keywords: electrospark deposition, coatings, nickel alloy, copper alloy, corrosion
Evaluation of the electrospark deposition (ESD) process suggests that this is a viable in-situ method for repairing small worn and corroded areas on nickel- and copper-base alloys. Metallographic analysis showed metallurgically bonded ESD coatings with no interconnected porosity and microcracking through the coating to the substrate. Microhardness measurements made on ESD Alloy 400 indicated uniformity in microhardness across the coating as well as within the Alloy K500 substrate, substantiating the premise that the ESD process does not alter the microstructure of the base material. Potentiodynamic polarization testing of ESD Alloy 400 and 70/30 copper-nickel showed excellent correlation between the ESD coatings and similar wrought alloys. Crevice corrosion testing of ESD Alloys 625, 59, and C276 indicated no susceptibility for ESD Alloy 59 after 365 days’ seawater immersion. ESD Alloys 625 and C276 were susceptible to crevice corrosion, with maximum depths of attack of 0.011 in. (0.28 mm) and 0.009 in. (0.22 mm), respectively. Keywords: electrospark deposition, coatings, nickel alloy, copper alloy, corrosion
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