EIS Characteristics of Galvanic Couple of Aluminum Alloy and High-strength Steel under Thin Solution Films

EIS Characteristics of Galvanic Couple of Aluminum Alloy and High-strength Steel under Thin Solution Films

Galvanic corrosion of 6061-T6 (AA) coupled with high-strength steel (HSS) under 2 M NaCl solution films was investigated by electrochemical impedance spectroscopy (EIS). The AA is passivated in a 2 M NaCl solution and suffered pitting corrosion by galvanic coupling with HSS of the same surface area....

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Veröffentlicht in:Journal of the Electrochemical Society 2020-10, Vol.167 (13), p.131507
Hauptverfasser: Tran, Van Nam, Ooi, Azusa, Tada, Eiji, Nishikata, Atsushi
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Sprache:eng
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Aluminum alloy
Atmospheric corrosion
Electrochemical impedance spectroscopy
Galvanic corrosion
High-strength steel
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container_issue 13
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container_title Journal of the Electrochemical Society
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creator Tran, Van Nam
Ooi, Azusa
Tada, Eiji
Nishikata, Atsushi
description Galvanic corrosion of 6061-T6 (AA) coupled with high-strength steel (HSS) under 2 M NaCl solution films was investigated by electrochemical impedance spectroscopy (EIS). The AA is passivated in a 2 M NaCl solution and suffered pitting corrosion by galvanic coupling with HSS of the same surface area. Impedance of the AA/HSS couple was successfully measured under thin solution films (25-100 m) using a potentiostat as a zero-resistance ammeter. The obtained impedance data shows a typical transmission line behavior above 1 kHz, owing to a nonuniform current distribution. Impedances for the AA and HSS were separately measured in the frequency domain. The average growth rate of pits on the AA surface, estimated from the charge transfer resistance for AA, increased with decreasing solution film thickness.
doi_str_mv 10.1149/1945-7111/abbb44
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subjects Aluminum alloy
Atmospheric corrosion
Electrochemical impedance spectroscopy
Galvanic corrosion
High-strength steel
title EIS Characteristics of Galvanic Couple of Aluminum Alloy and High-strength Steel under Thin Solution Films
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