پديدآورندگان :
Soltani N Payame Noor University , Rasouli N Payame Noor University , Hoseinzade M Payame Noor University
كليدواژه :
Corrosion , Chitosan , Spinel , Potentiodynamic polarization , electrochemical impedance spectroscopy (EIS)
چكيده فارسي :
The use of corrosion inhibitors is one of the most economical and simplest method for
overcoming the corrosion problems [1-3]. From the standpoint of safety, the expansion of nontoxic
and effective inhibitors is required. Chitosan is a natural polycationic copolymer and is
one of the important biopolymers that extensively used in pharmaceutical applications, such as
in tissue engineering materials, drug carriers [4]. Chitosan is rich in hydroxyl and amino
groups, so it is a good potential inhibitor. Umoren et al. were estimated the inhibition action of
chitosan on the corrosion of mild steel in 0.1 M HCl solution. They found that chitosan inhibit
corrosion of mild steel even at a very low concentration and inhibition efficiency increases with
a rise in temperature up to 96 %at 60°C and then drops to 93 % at 70 °C, while it slightly
increases with an increase in chitosan concentration [5]. The inhibition action of 2-N,Ndiethylbenzene
ammonium chloride N-oxoethyl chitosan and 12-ammonium chloride Noxododecan
chitosan on the corrosion of carbon steel in 1 M HCl has been evaluated. The
results illustrate that the inhibition efficiency of 2-N,N-diethylbenzene ammonium chloride Noxoethyl
chitosan in 1 M HCl at varying temperature is higher than for chitosan and 12-
ammonium chloride N-oxododecan chitosan [1]. The main aim of this study is investigation of
inhibition action of Mg0.5Mn0.5Fe2O4/chitosan nanocomposite on the corrosion of 316L stainless
steel in 2 M HCl and 1 M H2SO4 solutions. The synthesized nanocomposite was evaluated
using X-ray diffraction (XRD) and field emission scanning electron micrographs (FESEM).
The corrosion behavior of 316L stainless steel was estimated by using electrochemical methods
including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
methods in both acidic media in the absence and presence of various concentration of chitosan,
Mg0.5Mn0.5Fe2O4 and Mg0.5Mn0.5Fe2O4/chitosan nanocomposite. In order to designed the effect
of temperature on the behavior of nanocomposite, polarization measurements in the temperature
range of 25-65 °C was carried out for different concentration of three mentioned inhibitor.
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Comparing the results indicated that, for both acidic media, the inhibition efficiency of
Mg0.5Mn0.5Fe2O4/chitosan nanocomposite at all investigated temperature is higher than chitosan
and Mg0.5Mn0.5Fe2O4. The nanocomposite was found to inhibit corrosion even at a very low
concentration (0.1 g/L) and high temperature (99 % at 65°C). Because of these features and
non-toxic properties of nanocomposite, we think this inhibitor can be introduced for use in the
oil and gas industry.
