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Corrosion of polypyrrole: Kinetics of chemical and electrochemical processes in NaOH solutions
Ist Teil von
Corrosion science, 2017-04, Vol.118, p.96-108
Ort / Verlag
Amsterdam: Elsevier Ltd
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•Chemical and electrochemical corrosion kinetics of PPy in NaOH are identified.•Two corrosion stages are proved to follow first-order kinetics in PPy corrosion.•Dissolved oxygen and concentrations of NaOH play key roles in PPy corrosion.•Chemical and electrochemical processes are mutually promoted in PPy corrosion.
The corrosion kinetics of PPy/SO4 in aerated and de-aerated NaOH solutions (0.02–0.5M) were investigated and the interaction between chemical and electrochemical corrosion processes was verified. The corrosion of PPy is mainly caused by the chemical attack of OH− in de-aerated NaOH, but is accelerated largely in aerated NaOH for the occurrence of the electrochemical processes. These two processes are mutually promoted in aerated NaOH. At a constant NaOH concentration (CNaOH), two corrosion stages are proved to follow first-order kinetics. In each corrosion stage, the chemical and electrochemical processes have different kinetic behavior and CNaOH has important influence on them.