Chemical Behavior And Corrosion Inhibition Of Zinc Electrode In Phosphate Solutions Under Open Circuit Conditions

Document Type : Original Article

Authors

1 Chemistry Department, Zagazig University, Zagazig, Egypt.

2 Chemistry Administration, Cairo†, Egypt.

Abstract

Abstract:
The electrochemical behavior of zinc electrode has been studied in different
concentrations of Na3PO4.12H2O solution using a simple potentiometric method. The study
involves the measurement of the electrode potentials under open-circuit conditions. The
potential was followed as a function of both time and Na3PO4.12H2O solution concentration
until the values of steady-state potential are obtained. The steady potential changed on the
addition of increasing amounts of different aggressive anions due to the breakdown of
passivity. The way of variation of the steady-state potentials of zinc electrode in aggressive
solutions upon the addition of increasing quantities of some inhibitors as the type of inorganic
inhibitors are also concerned. The potential shifts towards more positive values the addition of
inhibitors and the potential curves recall those reported in aggressive anion-free solution
indicating pitting corrosion. The micrograph of zinc surface in presence of different
concentrations of aggressive ions was investigated using Scanning Electron Microscope SEM.

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