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Oxide film formation on zinc in borate solutions under open circuit
Faculty
Science
Year:
2008
Type of Publication:
Article
Pages:
41-46
Authors:
El Aal, E. E. Abd
DOI:
10.1016/j.corsci.2007.05.033
Journal:
CORROSION SCIENCE PERGAMON-ELSEVIER SCIENCE LTD
Volume:
50
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000253093100007
Keywords :
zinc, electrode potential, passive films, passivity
Abstract:
The open circuit potentials of Zn electrode were followed as a function of time in different concentration of Na2B4O7 Solution until steady-state, E-st., values were attained. The potential shifts immediately towards positive values, indicating film thickening and repair. The rate of oxide film thickening was determined from the linear relationship between the open circuit potential, E, of the Zn electrode and the logarithm of immersion time t as E = a(1) + b(1) log t. The liner plots consist of two segments indicating the duplex nature of the formed oxide film on the Zn surface. The final steady-state potential, E-st., varied with the logarithm of molar concentration of Na2B4O7 solution according to: E-st. = a(2) - b(2) log C-Na2B4O7. The effect of rising pH and temperature was also studied. It was found that the rising of pH and temperature of the solution affect on the rate of oxide film thickening and the final steady- state potential. (c) 2007 Elsevier Ltd. All rights reserved.
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