IMMAGE abstract
Title: Hydro- and electrometallurgical treatment of cassiterite (SnO2) concentrate.
Author: Madkour L.H.
Keywords: CASSITERITE, ELECTROMETALLURGY, FLOWSHEETS, HYDROMETALLURGY,
LABORATORY STUDY,
Abstract: Three processing routes were studied: a fusion process followed by leaching and tin electrolysis; gr
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Subject: METALLURGY
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Journal Article
Inhibition of copper corrosion by
arylazotriazoles in nitric acid
solution
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Journal
Monatshefte für
Chemie /
Chemical
Monthly
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Publisher
Springer Wien
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ISSN
0026-9247
(Print) 14344475 (Online)
Issue
Volume 126,
Number 10 /
October, 1995
Category
Anorganische
Und
Physikalische
Chemie
DOI
10.1007/BF0081
1379
Pages
1087-1095
Subject Collection
Chemistry and
Materials
Science
SpringerLink Date
Monday,
December 13,
2004
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L. H. Madkour1, M. A. Elmorsi1 and
M. M. Ghoneim1
(1) Chemistry Department, Faculty of Science, Tanta
University, Tanta, Egypt
Received: 10 January 1995 Accepted: 24 April 1995
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Summary A study has been made to
investigate the effect of some azoheterocyclic
dyes of the type 3-arylazo 1,2,4-triazole (AT)
on the corrosion of copper exposed to 0.5M
nitric acid solution at different temperatures
and at differentAT concentrations. Using
potentiodynamic polarization andTafel
electrochemical methods, it can be shown
thatAT compounds are good inhibitors of
copper corrosion in HNO3 solution. The kinetic
and thermodynamic parameters of the
inhibited system were determined. The high
inhibition efficiency of these compounds may
be due to the adsorption of the additive itself
and/or the adsorption of the formed Cu(II)-AT
complexes at the polarized electrode interface.
Cathodic polarization measurements showed
thatAT dyes are predominantly cationic
inhibitors.
Keywords Acid medium Arylazotriazoles - Inhibition - Copper
Zusammenfassung Der Effekt einiger
azoheterocyclischer Farbstoffe des Typs 3Arylazo-1,2,4-triazol (AT) auf die Korrosion
von Kupfer in 0.5M Salpetersäure bei
verschiedenen Temperaturen und
unterschiedlichenAT-Konzentrationen wurde
untersucht. Potentiodynamische Polarisation
und elektrochemische Methoden nachTafel
zeigen, daß Verbindungen vom TypAT gute
Korrosionsinhibitoren für Kupfer gegenüber
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HNO3 sind. Die kinetischen und
thermodynamischen Parameter des inhibierten
Systems wurden bestimmt. Die hohe
inhibitorische Wirksamkeit der untersuchten
Verbindungen kann auf die Adsorption des
Additivs selbst oder auf jene des Cu(II)-ATKomplexes an der polarisierten
Elektrodenoberfläche zurückzuführen sein.
Kathodenpolarisationsmessungen zeigen,
daßAT-Farbstoffe vorwiegend kationische
Inhibitoren sind.
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