Localized Corrosion Behavior of AZ31B Magnesium Alloy with an Electrodeposited Poly(3,4-Ethylenedioxythiophene) Coating | Zendy

Ushula M. Tefashe | Zendy; Philippe DauphinDucharme | Zendy; Mohsen Danaie | Zendy; Zachary P. Cano | Zendy; Joseph R. Kish | Zendy; Gianluigi A. Botton | Zendy; Janine Mauzeroll | Zendy

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Localized Corrosion Behavior of AZ31B Magnesium Alloy with an Electrodeposited Poly(3,4-Ethylenedioxythiophene) Coating

Author(s) -

Ushula M. Tefashe,

Philippe DauphinDucharme,

Mohsen Danaie,

Zachary P. Cano,

Joseph R. Kish,

Gianluigi A. Botton,

Janine Mauzeroll

Publication year - 2015

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/2.0601510jes

Subject(s) - corrosion , pedot:pss , materials science , passivation , poly(3,4 ethylenedioxythiophene) , coating , alloy , magnesium alloy , microstructure , magnesium , metallurgy , chemical engineering , composite material , polymer , layer (electronics) , engineering

Herein we report the characterization of localized corrosion of AZ31B magnesium alloy electrochemically coated with poly(3,4-ethylenedioxythiophene) (PEDOT) from ionic liquid electrolyte. Several scanning probe techniques including high resolution electron microscopy, SVET, SECM amperometric detection of H2 fluxes, potentiometric SECM detection of local pH and localized potentiodyanmic measurements were used to evaluate the microstructure of the coating and its corrosion protectiveness. In order to examine long-term durability of corrosion protection due to the PEDOT coating, these measurements were performed after different immersion times. It was observed that PEDOT coating appears to lose its protective ability after localized coverage of corrosion products. The results of this study provide important information considering the interest in this coating for use in biomedical implants and prior indications of beneficial passivation

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