Abstract
The inhibition performance and mechanism of loquat leaves extract (LLE) for the corrosion of mild steel in 0.5 M H2SO4 were investigated using weight loss method, electrochemical measurements and scanning electron microscope (SEM). The results revealed that LLE acted as a modest cathodic inhibitor, its inhibition efficiency increased with the concentration of LLE and reached a maximum value of 96% at the 100% V/V concentration, but decreased with incremental temperature. Besides, it was found that the adsorption of LLE on steel surface obeyed Langmuir adsorption isotherm, and then the thermodynamic and kinetic parameters were further determined accordingly. Furthermore, LLE was preliminarily separated by pH-gradient sedimentation and the synergistic inhibition between the isolates was investigated.
Highlights
In recent years, plant extracts as corrosion inhibitors have attracted extensive attention due to their properties of environment-friendliness, low cost and renewability[1,2,3]
This paper reports the effect of acid extract of loquat leaves as an environmentally friendly corrosion inhibitor for mild steel in 0.5 M H2SO4 using gravimetric technique, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and microscopic examination
loquat leaves extract (LLE) was preliminarily separated by pH-gradient sedimentation, the isolates were characterized through high performance liquid chromatograph (HPLC), mass spectrometry (MS), amino acid analyzer and Fourier transform infrared spectroscopy (FTIR), and the synergistic inhibition between the isolates was investigated
Summary
Plant extracts as corrosion inhibitors have attracted extensive attention due to their properties of environment-friendliness, low cost and renewability[1,2,3].
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