Evaluation of benzotriazole as corrosion inhibitor for carbon steel as reinforcement of concrete
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2006
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ELECTROCHEMICAL SOCIETY MEETING, 210th
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Resumo
Chlorides are very often the cause of localised
corrosion in concretes due to their penetration from
environment, mainly in marine atmospheres. Corrosion
inhibitors is usually used as a corrosion prevention
method against this form of corrosion in reinforced
concretes. Nitrite is the main inhibitor for this purpose
and it has been widely used for many years. However
there are some limitations to its use such as environmental
constraints due to the its toxic effect, mechanism of
inhibition (anodic type), and also the relatively high costs
of this type of additive. Research has been carried out in
order to find other non toxic inhibiting additives for this
application. In this investigation, benzotrizole (BTA), that
is a well known corrosion inhibitor for stainless steel and
carbon steels in acid media, has been evaluated as a
possible corrosion inhibitor in the chloride containing
alkaline environment typical of concretes in marine
atmospheres.
The corrosion inhibiting efficiency of BTA in
the concentrations corresponding to 0.5%, 1% and 1.5%
im massa, was investigated. These concentrations were
added to a reference solution composed of 0.01N NaOH
plus 0.05N KOH with 3.5% NaCl and the efficiency was
estimated based on the corrosion rates obtained in this last
solution. The effect of BTA was compared to the nitrite
using solutions with similar concentration of the
inhibiting additive. All reagents used for solutions
preparation were of analytical grade. The test solutions
were maintained at 20 o
C under naturally aerated
conditions. The surface of the carbon steel samples were
prepared by ground with silicon carbide paper up to #600.
After surface preparation the electrodes were immersed in
the various test solutions used and the open circuit
potential was measured as a function of time. The
evolution of the corrosion resistance was evaluated by
electrochemical impedance spectroscopy (EIS) from 1
until 6 days of immersion in the various test solutions.
After this period, potentiodynamic polarization tests were
carried out.
A three-electrode cell arrangement was used for
the electrochemical measurements, with Ag/AgCl and a
platinum wire as reference and auxiliary electrodes,
respectively. All potentials referred to in this work are
with respect to Ag/AgCl.
Polarization measurements were carried out using a
Solartron SI 1287 potentiostat in the potential range from
–0.25 V to 0.25 V versus the open circuit potential (Eocp)
at a scan rate of 0.5 mV/s.
The EIS tests were accomplished by means of a
Solartron Model SI 1255 Frequency Response Analyzer
coupled to a Princeton Applied Research (PAR) Model
273A Potentiostat/Galvanostat. The diagrams were
obtained in potentiostatic mode at the corrosion potential,
Ecorr, with an ac perturbation amplitude of 10 mV in the
frequency range from 100 kHz to 10 mHz, with 8 points
per decade.
The EIS results for the solutions with various
BTA contents after 6 days of immersion are shown in
Figure 1 as Nyquist and Bode diagrams.
Como referenciar
MENNUCCI, MARINA M.; COSTA, ISOLDA. Evaluation of benzotriazole as corrosion inhibitor for carbon steel as reinforcement of concrete. In: ELECTROCHEMICAL SOCIETY MEETING, 210th, October 29-November 3, 2006, Cancun, Mexico. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/32995. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.