Zagazig University Digital Repository
Home
Thesis & Publications
All Contents
Publications
Thesis
Graduation Projects
Research Area
Research Area Reports
Search by Research Area
Universities Thesis
ACADEMIC Links
ACADEMIC RESEARCH
Zagazig University Authors
Africa Research Statistics
Google Scholar
Research Gate
Researcher ID
CrossRef
Galvanostatic study of the breakdown of Zn passivity by sulphate anions
Faculty
Science
Year:
2009
Type of Publication:
Article
Pages:
1780-1788
Authors:
El Aal, E. E. Abd, El Wanees, S. Abd
DOI:
10.1016/j.corsci.2009.05.003
Journal:
CORROSION SCIENCE PERGAMON-ELSEVIER SCIENCE LTD
Volume:
51
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000268656300033
Keywords :
Zinc, Galvanostatic, Pitting corrosion, Anodic films, Polarization, Passive films
Abstract:
The anodic behavior of Zn electrode in Na(2)SO(4) Solutions was studied by galvanostatic polarization technique. The polarization curves are characterized by a distinct arrest corresponding to ZnO formation, after which the potential rises linearly with time up to a well-defined value, the breakdown potential, at which the potential drops with time, down to more negative direction. This denotes the destruction of the passive film and initiation of pitting corrosion. It was found that, the breakdown potential, the time consumed till the breakdown potential and the rate of potential rise with time depend on the sulphate anions concentration, solution temperature and magnitude of the imposed current density. Addition of increasing concentration of phosphate, molybdate, tungstate or chromate anions causes a shift of the breakdown potential into the noble direction, indicating the inhibitive effect of these anions. The inhibitive effect of these inhibitors decreases in the order: CrO(4)(2-) > WO(4)(2-) > MoO(4)(2-) > HPO(4)(2-). Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
Online
PDF
جامعة المنصورة
جامعة الاسكندرية
جامعة القاهرة
جامعة سوهاج
جامعة الفيوم
جامعة بنها
جامعة دمياط
جامعة بورسعيد
جامعة حلوان
جامعة السويس
شراقوة
جامعة المنيا
جامعة دمنهور
جامعة المنوفية
جامعة أسوان
جامعة جنوب الوادى
جامعة قناة السويس
جامعة عين شمس
جامعة أسيوط
جامعة كفر الشيخ
جامعة السادات
جامعة طنطا
جامعة بنى سويف