Natural Plants: An Efficient Inhibitors Of Mild Steel Corrosion In H2SO4 Acid | 107253
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The effect of aqueous extract of three natural plants called: Tribulus Terrestris (TTAE) (Inh. 1), Vachellia Nilotica
(VNAE) (Inh. 2) and Cymbopogeon Schoenanthus (CSAE) (Inh. 3) as inhibitors of mild steel corrosion in 1.0N
H2SO4 acid solution at 30°C was investigated using weight loss (WL), electrochemical impedance spectroscopy (EIS)
and potentiodynamic polarization (PDP). The results showed that the three inhibitors worked well to inhibit the
corrosion of mild steel in 1.0N H2SO4 acid, depending on the following order: TTAE> VNAE>CSAE. The addition
of increasing amount of the studied inhibitors inhibit the corrosion rate of mild steel and maximum inhibition
efficiency of 91.37%, 88.51%, and 87.14% respectively was obtained at 2.0 g/L-1. Different adsorption isotherm models
were tested and Langmuir adsorption isotherm showed best fit with the parameters. The inhibition mechanism was
discussed based on adsorption on mild steel surface from 1.0N H2SO4 acid solution. The analysis of FTIR spectra
established the formation of a strong bond between inhibitors species and mild steel surface.
1. Aisha H Al-Moubaraki, Aisha A Al-Howiti, Mervat M Al-Dailami and Enas A Al-Ghamdi (2017) Role of
aqueous extract of celery (Apium graveolens L.) seeds against the corrosion of aluminium/sodium hydroxide
systems. Journal of Environmental Chemical Engineering 5:4194-4205.
2. Aisha H Al-Moubaraki and Hind H Al-Rushud (2017) Anticorrosive effects of leek seeds aqueous extract
(Allium ampeloprasumVar. Kurrat) on aluminum alloys 6061, 7075 and 2024 in Seawater. Organic and Medicinal
Chemistry International Journal 3(5):1-10.
3. Aisha H Al-Moubaraki (2018) Potential of borage flowers aqueous extract, Borago officinalis L., against the
corrosion of mild steel in phosphoric acid. Anti-Corrosion Methods and Materials 65:53-65.
4. Aisha H Al-Moubaraki and Hind H Al-Rushud (2018) The red sea as a corrosive environment: corrosion rates
and corrosion mechanism of aluminum alloys 7075, 2024, and 6061. International Journal of Corrosion 1-15.
5. Ehteram A Noor, Aisha H Al-Moubaraki and Azza A Al-Ghamdi (2019) Continuous studies on using camel???s
urine as nontoxic corrosion inhibitor???corrosion inhibition of Al???Cu alloy in alkaline solutions. Arabian Journal
for Science and Engineering 44(1): 237-250
Aisha H Al-Moubaraki is an Associate Professor of Physical Chemistry at University of Jeddah KSA. Her research interest are in corrosion behavior of metals in aqueous solutions-kinetic and thermodynamic studies; corrosion inhibition of metals in aqueous solutions by some organic and natural inhibitors and corrosion behavior of metals in natural environments such as soils and seawater.