Effect of polypyrrole conformational rearrangement on Al alloys corrosion protection

► Polypyrrole (PPy) films deposited on Al alloys. ► Electrochemically induced conformational relaxation. ► PPy redox behavior determined by polymer structure and substrate nature. ► Corrosion protection strongly influenced by the rate at which redox processes are promoted. ► Galvanic coupling for an...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 688; no. 1; pp. 289 - 297
Main Authors Volpi, Enrico, Trueba, Monica, Trasatti, Stefano P., Trasatti, Sergio
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2013
Subjects
Al alloys
alloys
aluminum
corrosion
Corrosion protection
Electrochemical relaxation
physicochemical properties
polymers
Polypyrrole
sodium chloride
Electrochemical relaxation
Al alloys
Corrosion protection
Polypyrrole
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Abstract ► Polypyrrole (PPy) films deposited on Al alloys. ► Electrochemically induced conformational relaxation. ► PPy redox behavior determined by polymer structure and substrate nature. ► Corrosion protection strongly influenced by the rate at which redox processes are promoted. ► Galvanic coupling for an effective protection of Al alloy 2024 by PPy. Polypyrrole (PPy) films were galvanostatically synthesized on 6082-T6 and 2024-T3 Al alloys. Experiments based on Otero’s Electrochemically Stimulated Conformational Relaxation (ESCR) model were used to investigate PPy re-oxidation kinetics as a function of polymer compaction. Chronoamperograms after pre-polarization at different cathodic potentials for various times were recorded in LiClO4/propylene carbonate solution. Physico-chemical parameters such as compaction coefficient, closing potential and diffusion parameter were used to characterize the relaxation and diffusion controlled processes of PPy films. All indicate that conformational rearrangements depend mainly on polymer structure, governed in turn by substrate nature. However, experiments in aggressive NaCl solution have confirmed the importance of the redox process dynamics on the protection performance of PPy against Al alloy degradation. Galvanic coupling has been confirmed to be the main factor for effective corrosion protection of Al 2024 by Ppy.
AbstractList ► Polypyrrole (PPy) films deposited on Al alloys. ► Electrochemically induced conformational relaxation. ► PPy redox behavior determined by polymer structure and substrate nature. ► Corrosion protection strongly influenced by the rate at which redox processes are promoted. ► Galvanic coupling for an effective protection of Al alloy 2024 by PPy. Polypyrrole (PPy) films were galvanostatically synthesized on 6082-T6 and 2024-T3 Al alloys. Experiments based on Otero’s Electrochemically Stimulated Conformational Relaxation (ESCR) model were used to investigate PPy re-oxidation kinetics as a function of polymer compaction. Chronoamperograms after pre-polarization at different cathodic potentials for various times were recorded in LiClO4/propylene carbonate solution. Physico-chemical parameters such as compaction coefficient, closing potential and diffusion parameter were used to characterize the relaxation and diffusion controlled processes of PPy films. All indicate that conformational rearrangements depend mainly on polymer structure, governed in turn by substrate nature. However, experiments in aggressive NaCl solution have confirmed the importance of the redox process dynamics on the protection performance of PPy against Al alloy degradation. Galvanic coupling has been confirmed to be the main factor for effective corrosion protection of Al 2024 by Ppy.
Polypyrrole (PPy) films were galvanostatically synthesized on 6082-T6 and 2024-T3 Al alloys. Experiments based on Otero’s Electrochemically Stimulated Conformational Relaxation (ESCR) model were used to investigate PPy re-oxidation kinetics as a function of polymer compaction. Chronoamperograms after pre-polarization at different cathodic potentials for various times were recorded in LiClO₄/propylene carbonate solution. Physico-chemical parameters such as compaction coefficient, closing potential and diffusion parameter were used to characterize the relaxation and diffusion controlled processes of PPy films. All indicate that conformational rearrangements depend mainly on polymer structure, governed in turn by substrate nature. However, experiments in aggressive NaCl solution have confirmed the importance of the redox process dynamics on the protection performance of PPy against Al alloy degradation. Galvanic coupling has been confirmed to be the main factor for effective corrosion protection of Al 2024 by Ppy.
Author Trueba, Monica
Volpi, Enrico
Trasatti, Sergio
Trasatti, Stefano P.
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Keywords Electrochemical relaxation
Al alloys
Corrosion protection
Polypyrrole
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Snippet ► Polypyrrole (PPy) films deposited on Al alloys. ► Electrochemically induced conformational relaxation. ► PPy redox behavior determined by polymer structure...
Polypyrrole (PPy) films were galvanostatically synthesized on 6082-T6 and 2024-T3 Al alloys. Experiments based on Otero’s Electrochemically Stimulated...
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StartPage 289
SubjectTerms Al alloys
alloys
aluminum
corrosion
Corrosion protection
Electrochemical relaxation
physicochemical properties
polymers
Polypyrrole
sodium chloride
Title Effect of polypyrrole conformational rearrangement on Al alloys corrosion protection
URI https://dx.doi.org/10.1016/j.jelechem.2012.10.022
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