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Kinetic studies of zinc passivation in borate solutions under different conditions
Faculty
Science
Year:
1999
Type of Publication:
Article
Pages:
582-589
Authors:
Abd El Aal, EE
Journal:
CORROSION NATL ASSN CORROSION ENG
Volume:
55
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000080865100006
Keywords :
activation energy, anodic dissolution, anodic polarization, atmospheric corrosion, coatings, films, galvanostatic polarization, passivation, sodium borate, zinc, zinc oxide
Abstract:
The anodic polarization of zinc in sodium borate (Na2B4O7) solutions of different concentrations was studied under gal vanostatic polarization conditions. Potential-us-time curves obeyed the empirical relation (dE/dt)(i) = a(i)(b). The oxide formation rate increased with decreasing concentrations of borate and increasing current density. However, increasing the solution temperature and pH decreased the oxide formation rate because of the partial dissolution of the oxide film. The activation energy (Delta H-.) for anodic dissolution of the oxide was found to be 16 kJ/mol. Saturation of the solution with oxygen increased the oxide formation rate more than with hydrogen gas or when naturally aerated. mis behavior was attributed to the fact that oxygen assisted in passivation and delayed dissolution processes.
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