The presence of 6% orange peel gives 78% inhibitive efficiency protection to mild steel in 5% HCl
at 25 °C and the compounds in orange peel extract affecting cathodic polarization. These
compounds were given from orange peel whit drying and crushing peels and boiling these
materials with distilled water. Orange peel is an industrial by-product from juice processing. In
this work for the first time the compounds as corrosion inhibitor are given from the compressed
orange peel straightly. It was found that this Orange peel extraction method can effectively
protect (>98%) mild steel from corrosion in 1 MHCl solution. (Saleh, 1982)
The presence of absorptive chemicals, as shown by GCMS and FTIR investigations, makes banana
peel extract a good option as a corrosion inhibitor. Steel has emerged as the most important
engineering alloy utilized by humans since it was invented. However, it has a major problem with
corrosion when exposed to regular climatic conditions. Using natural organic extract has become
a popular method for preventing steel corrosion. The main objective of this project is to create a
green corrosion inhibitor using banana and orange peel. The gravimetric method was used to
determine the corrosion of bright steel in acidic media (HCl), with equal amounts of BPE and OPE
added as corrosion inhibitors. (R. Vani, 2021).
The potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), X-ray
photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were used to
investigate the inhibitory effects of orange peel extract (OPE) on Q235 carbon steel corrosion in
CO2-saturated and CO2/H2S coexisting brine solutions. The electrochemical experiments
demonstrate that OPE may effectively prevent the corrosion of Q235 steel caused by CO2 and
CO2/H2S. OPE had a better corrosion prevention efficacy in CO2-saturated brine solutions than in
CO2/H2S coexistent brines. 1000 mg L−1 OPE inhibited CO2 and CO2/H2S brine solutions by
97.6% and 73.1%, respectively. The double-layer capacitance values of the working electrodes
declined significantly after OPE was introduced to the brine solutions and continued to decrease
steadily as the dosage of OPE. OPE is rich in oxygen- and nitrogen-containing groups as revealed
by Fourier transform infrared (FT-IR) analysis and functions via the adsorption of these groups on
the steel surface according to the XPS analysis. The adsorption behavior of these OPE moieties
follows the Langmuir adsorption isotherm. (Zhang, C., Zhao, J., 2018)
The corrosion cannot be prevented, but it can be managed or blocked. Inhibitor addition is one
approach for controlling corrosion inside a pipe. Corrosion inhibitors included both inorganic and
organic chemical inhibitors. Organic inhibitors are made from both synthetic and natural
materials. The purpose of this study was to assess the efficacy of inhibition from banana peel to
carbon steel at various inhibitor concentrations and immersion times in acid solution variations.
The researchers used inhibitor concentrations of 0 gram/liter, 2 gram/liter, 4 gram/liter, and 6
gram/liter, as well as carbon steel immersion times of 2, 4, 6, 8, and 10 hours. It was submerged
in chloride acid solutions comprising 0.5 M and 1.5 M. Carbon steel AISI 4041 was utilized as the
specimen steel. The results were examined by calculating corrosion rates for each specimen and
determining inhibitor efficiency. It was discovered that the specimens without inhibitors
produced a rapid corrosion rate after a long immersion duration and a high concentration of HCl.
However, the specimens with inhibitor had the lowest corrosion rate, which was 78.59% at 6
gram/litre and 10 hours in 0.5 M HCl. (Komalasari, S P Utami, M I Fermi, Y Aziz and R S Irianti,
2018).
The chemical components included in orange peel extracts were identified and their antioxidant
activity assessed. The extract and selected antioxidant components (neohesperidin, naringin,
ascorbic acid) were examined independently for their inhibitory effect on acidic steel corrosion
using electrochemical techniques. Whatever the extract content, a considerable inhibition is
seen, whereas certain antioxidant substances have only a minor effect. Both electrochemical
impedance spectroscopy and scanning electron microscopy measurements after immersion
show that orange peel extract's inhibitory efficacy is related not only to the antioxidant activity of
its components, but also to the precipitation of a surface coating. (M’hiri, N., 2016)
The deterioration of metals in an environment of application is inevitable. Metals corrosion has
drained the world economy and has caused loss of human lives and valuable properties.
Preventive mechanisms are often put in place and the most economical is the use of chemical
inhibitors. Organic and inorganic metals corrosion inhibitors are effective but are somewhat
expensive and harmful to human and the natural environments. Peel extracts from a variety of
sources have been used successfully as corrosion inhibitors. These include, but are not limited to,
longan, passion fruit, orange, mango, and bananas. It was discovered that these peel extracts
perform very well on AA in alkaline media. PS has a maximal inhibitory efficiency (η%) of 94.5%
at 1.5g/L. The effectiveness of AA protection in an inhibited system was examined using scanning
electron microscopy (SEM) and atomic force microscopy (AFM). The adsorption of inhibitors on
the AA surface followed the Langmuir adsorption isotherm. Potentiodynamic polarization
experiments revealed a heterogeneous mode of corrosion inhibition for all inhibitors. SEM and
AFM results complimented those from weight loss and electrochemical experiments. (Umoren,
2019).
