کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
219232 463252 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of polypyrrole conformational rearrangement on Al alloys corrosion protection
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effect of polypyrrole conformational rearrangement on Al alloys corrosion protection
چکیده انگلیسی

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 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 688, 1 January 2013, Pages 289–297
نویسندگان
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