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Electrochemical Characterization of Coated Self-Piercing Rivets for Magnesium Applications

Journal Article
2015-01-9085
ISSN: 1946-3979, e-ISSN: 1946-3987
Published January 01, 2016 by SAE International in United States
Electrochemical Characterization of Coated Self-Piercing Rivets for Magnesium Applications
Sector:
Citation: Upadhyay, V., Qi, X., Wilson, N., Battocchi, D. et al., "Electrochemical Characterization of Coated Self-Piercing Rivets for Magnesium Applications," SAE Int. J. Mater. Manf. 9(1):187-199, 2016, https://doi.org/10.4271/2015-01-9085.
Language: English

Abstract:

This work reports on measurement and analysis of the galvanic interaction between steel self-piercing rivets (SPRs) having several different surface conditions and magnesium alloy substrates under consideration for use in automotive structural assemblies. Rivet surface conditions included uncoated steel, conventional Zn-Sn barrel plating and variations of commercial aluminizing processes, including supplemental layers and sealants. Coating characteristics were assessed using open circuit potential (OCP) measurement, potentiodynamic polarization scanning (PDS), and electrochemical impedance spectroscopy (EIS). The degree of galvanic coupling was determined using zero-resistance ammeter (ZRA) and the scanning vibrating electrode technique (SVET), which also permitted characterization of galvanic current flows in situ.

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