Volume 20 Preprint 7
The inhibitive action of eco-friendly compound on the corrosion of mild steel in brine water
S.Karthikeyan, P.A.Jeeva, R.Dinakaran, S.Narayanan
Keywords: Corrosion inhibitor, Antibiotic compounds, Impedance measurements, Adsorption
The inhibitive action of Dicloxacillin (DCX) on corrosion of mild steel in brine water (5% NaCl) has been studied using weight loss, gasometric measurements , potentiodynamic polarization and impedance studies. The studies clearly indicated that DCX acted as cathodic inhibitor. The adsorption of the compound on mild steel surface obeyed Temkinâ€™s adsorption isotherm. Diffused reflectance spectra and SEM images confirmed the formation of adsorbed film of inhibitor on metal.
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The inhibitive action of ecoeco-friendly compound on the corrosion
of mild steel in brine water
S.Karthikeyan 1*, P.A.Jeeva
, R.Dinakaran2, S.Narayanan1
Centre for Innovative Manufacturing Research, VIT University, Vellore- 632 014, India.
School of Mechanical Engineering, VIT University, Vellore- 632 014, India.
corresponding author (email@example.com
The inhibitive action of Dicloxacillin
brine water (5% NaCl)
(DCX) on corrosion of mild steel in
has been studied using weight loss, gasometric
measurements , potentiodynamic polarization and impedance studies. The studies
clearly indicated that DCX acted as
cathodic inhibitor. The adsorption of the
compound on mild steel surface obeyed Temkin’s adsorption isotherm. Diffused
reflectance spectra and SEM images confirmed the formation of adsorbed film of
inhibitor on metal.
Keywords : Corrosion inhibitor, Antibiotic compounds, Impedance measurements,
Mild steel is an important category of materials due to their wide range of industrial
applications. It is used in many industries due to its excellent mechanical properties.
These are used in industries as pipelines for petroleum industries, storage tanks,
reaction vessels and chemical batteries (1).
Acids are widely used for Pickling,
Descaling, Acid Cleaning, Oil Well acidizing and other applications. Due to their high
corrosive nature acids may cause damage to the system components. Various
methods are used to decrease the corrosion rate of metals in acids, among the
different methods use of inhibitors is most commonly used (2-7). The use of
electrochemical corrosion. Heterocyclic compounds containing hetero atoms such as
S, N & O act as effective corrosion inhibitors for mild steel in acid media and have
been the subject of many publications(8-11).
Organic compounds have been widely used as corrosion inhibitors for metals
in acidic media (12-18). The effective and efficient corrosion inhibitors were those
compounds which have π bonds and contains hetero atoms such as sulphur,
nitrogen, oxygen and phosphorous which allows the adsorption of compounds on
the metal surface(19-21). The organic inhibitors decrease the corrosion rate by
adsorbing on the metal surface and blocking the active sites by displacing water
molecules and form a compact barrier film on the metal surface. The most of the
organic inhibitors are toxic , highly expensive
and environment unfriendly.
Research activities in recent times are geared towards developing the cheap, nontoxic and environment friendly corrosion inhibitors.
The present paper describes a study of corrosion protection action of
DiCloxacillin on mild steel in brine water using weight loss, electrochemical
techniques and hydrogen permeation studies. Dicloxacillin is a narrow-spectrum βlactam antibiotic of the penicillin class. It is used to treat infections caused by
susceptible (non-resistant) Gram-positive bacteria. It is active against betalactamase-producing organisms such as Staphylococcus aureus, which would
otherwise be resistant to most penicillins. This compound shows
heteroatom’s S, N & O in its structure. The molecule is big enough (Molecular Mass;
457.86) and sufficiently planar to block more surface area (due to adsorption) on
mild steel. These factors favour the interaction of DCX with steel . As far as we know
no concrete report has been published so for Dicloxacillin in brine water with use of
electrochemical techniques, hydrogen permeation and diffuse reflectance spectra.
Hence the present study. The structure of the cloxacillin is shown in the fig.1.
Different concentrations of inhibitor were prepared and there inhibition efficiency in
acidic media was investigated.
The structure of the DCX is shown in the figure.1. Different concentrations of
inhibitor were prepared and their inhibition efficiencies in 5% salt water were
Mild steel specimens of compositions, C = 0.08%, P = 0.07%, Si = O%, S = O%,
Mn = 0.41% and Fe remainder, and of size 4 x 1 x 0.020 cm were used for weight
loss and gasometric studies. The weight loss study was carried out at room
temperature for three hours in 5% NaCl. The inhibition efficiency (IE %) was
determined by the following equation, I.E (%)
= (W0 –Wi /W0) X 100
Where W0 & Wi are the weight loss values in the absence and presence of the
A mild steel cylindrical rod of the same composition as above and
embedded in araldite resin with an exposed area of 0.283 cm2 was used for
potentiodynamic polarisation and AC impedance measurements.
The inhibitor was preliminarily screened by a weight loss method described earlier9.
Both cathodic and anodic polarisation curves were recorded in brine water (5% NaCl)
potentiodynamically (1 mA s-1) using corrosion measurement system BAS Model:
1OOA computerised electrochemical analyzer (made in West Lafayette, Indiana) and
PL-10 digital plotter (DMP-40 series, Houston Instruments Division). A platinum foil
and Hg/Hg2Cl2/5%NaCl were used as auxiliary and reference electrodes respectively.
Double layer capacitance (Cdl) and charge transfer resistance values (Rct,) were
measured using AC impedance measurements
The surfaces of corroded and
corrosion inhibited mild steel specimens were examined by diffuse reflectance
studies in the region 200- 700 nm using U-3400 spectrometer (UV-VIS-NIR
Spectrometer, Hitachi, Japan).
Results and Discussion
loss and Gasometric measurements
Table 1 gives the values of inhibition efficiency for different concentrations of
for the corrosion of mild steel in brine water obtained from
weight loss and gasometric measurements. It is found that the compound inhibits
the corrosion of mild steel effectively in salt water. The presence of tolyl and two –
CH3 groups in the molecule which shows inductive (+I) effect may increase the
electron density on the sulfur atom
that leads to better performance
A good conformity between the values of inhibition efficiency obtained by weight
loss and gasometric methods is found.
Potentiodynamic polarization studies
The corrosion kinetic parameters such as Tafel slopes ( ba
current (Icorr ) and corrosion potential (Ecorr ) and inhibition efficiency obtained from
potentiodynamic polarization curves for mild steel in brine water containing
different concentrations of inhibitor are given in table 2.
The values of ba, bc and Icorr are very much similar to those reported earlier
Further it is ascertained that increasing concentrations of DCX enhances the values
of both ba and bc ,but the values of bc are enhanced to greater extent. So the
inhibition of corrosion of mild steel in salt water is under cathodic control. Values of
Ecorr is shifted to less negative values in the presence of different concentrations of
compound. This can be ascribed to the formation of closely adherent adsorbed film
on the metal surface. The results of potentiodynamic polarization for the corrosion
of mild steel in brine water are given in figure 2.
Corrosion inhibition of mild steel in brine water solution with and without inhibitor
was investigated by electrochemical impedance spectroscopy measurements and it
is shown in figure .3 and the results are presented in table 3. At all concentrations
range of DCX, large capacitive circle at higher frequency range followed by small
capacitive loops at lower frequency range. The diameter of the circles increased
with increase in inhibitor concentration. The higher frequency capacitive loop is due
to the adsorption of inhibitor molecule14-18. Also the values of Rct
are found to
increase with increase in concentrations of compound in brine water solution
whereas values of Cdl are reduced considerably . This can be ascribed to the strong
adsorption of the compound on the metal surface. Similar observation was reported
and others22-25 for the corrosion inhibition of mild steel in acidic
media by Ampicilin drug and thio compounds.
Diffused Reflectance Studies
The formation of thin film on the surface of mild steel is ascertained by UV
reflectance studies carried out using spectrophotometer in different concentrations
of inhibitor with different mild steel specimens. The reflectance curves for polished
specimen, specimen dipped in salt water and different concentrations of inhibitor
are shown in the figure 4. The percentage of reflectance is maximum for polished
mild steel and it gradually decreases for the specimen dipped in brine water
solution. This observation reveals that the change in surface characteristic is due to
the corrosion of mild steel in salt water . When compared with uninhibited solution,
the reflectance percentage increased as the concentration of the inhibitor increased
.This can be ascribed to the increase in film thickness formed on mild steel surface
A plot of surface coverage (ø ) versus log C gives a straight line displaying that
the adsorption of DCX on the mild steel surface from brine water obeys Temkin’s
adsorption isotherm (Figure 5).
1. Dicloxaciilin retards the corrosion of mild steel effectively in brine water.
2. The inhibition of corrosion of mild steel in salt water , by the compound
followed cathodic control.
3. Rct and Cdl values obtained from impedance measurements confirm the
better enactment of the inhibitor.
4. The adsorption of the compound on mild steel surface observes Temkin’s
5. UV –reflectance studies disclose the mere adsorption of the inhibitor on
mild steel surface responsible for the corrosion inhibition of steel in brine water.
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Table 1. Values of inhibition efficiency for the corrosion of mild steel in brine
in the presence of different concentrations of Dicloxacillin obtained from weight
loss and gasometric measurements.
Inhibition efficiency (%)
Weight loss Studies
Table 2: Corrosion kinetic parameters of mild steel in brine water in the presence of
(mV vs SCE)
Table 3.Impedance values for the corrosion of mild steel in brine water in the
presence of different concentrations of DCX molecules .
Figure 1.Structure of Dicloxaciilin
Figure 2. Potentiodynamic polarization plot for mild steel in brine water with
different concentrations of DCX compound
Figure 3. Impedance curves for the corrosion of mild steel in brine water in the
and absence of Dicloxacillin.
Figure 4. UV Reflectance curves for Mild Steel in salt water with different concentrations of
Figure 5.Temkin’s adsorption isotherm for Dicloxacillin in brine water.