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Localized Corrosion on Coating Damaged Surface of Automotive Suspension Coil Springs

This study focuses on a better understanding of pitting and crevice corrosion on coating surface damaged carbon steels in automotive applications. Immersion and cyclic polarization tests were conducted on bare and coated metals in a 5% NaCl solution.

Product Number: 51317--9152-SG
ISBN: 9152 2017 CP
Author: Yugo Ashida
Publication Date: 2017
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This study focuses on a better understanding of pitting and crevice corrosion on coating surface damaged carbon steels for automotive applications. Cyclic polarization and immersion tests were conducted on unprotected surfaces in NaCl solutions. The morphology of pitting and crevice corrosion was characterized after the exposure to the corrosive environment. To simulate the coating damage of automotive suspension coil springs and stabilizer bars under road running conditions a hardness indenter was used to generate bottom crashed indent damage on ZnP pretreated and resin powder coated shopeened surfaces. Localized corrosion on the ZnP pretreated surface and damaged coating surface was investigated in both immersion testing and salt spray testing. The correlation between localized corrosion and the way of metal substrate exposure is studied. A corrosion model is discussed for carbon steels with damaged coating.

Key words: Pitting, crevice corrosion, carbon steel, ZnP pretreatment, coating damage, cyclic polarization, immersion test

This study focuses on a better understanding of pitting and crevice corrosion on coating surface damaged carbon steels for automotive applications. Cyclic polarization and immersion tests were conducted on unprotected surfaces in NaCl solutions. The morphology of pitting and crevice corrosion was characterized after the exposure to the corrosive environment. To simulate the coating damage of automotive suspension coil springs and stabilizer bars under road running conditions a hardness indenter was used to generate bottom crashed indent damage on ZnP pretreated and resin powder coated shopeened surfaces. Localized corrosion on the ZnP pretreated surface and damaged coating surface was investigated in both immersion testing and salt spray testing. The correlation between localized corrosion and the way of metal substrate exposure is studied. A corrosion model is discussed for carbon steels with damaged coating.

Key words: Pitting, crevice corrosion, carbon steel, ZnP pretreatment, coating damage, cyclic polarization, immersion test

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