Self-assembled monoterpenoid phenol as vapor phase atmospheric corrosion inhibitor of carbon steel

Corrosion inhibitors are the only most widely applied method for corrosion protection of metallic materials and are of particular importance in industry. Nowadays, the synthesis of corrosion inhibitors using traditional multistep reactions is highly restricted because of the increasing demands of "green chemistry". Plant materials and biomass wastes are ideal green candidatures to replace traditional toxic corrosion inhibitors. Literature survey reveals that different extracts of the plant and agro-food wastes contain naturally phytochemical compounds which have antioxidant properties have been effectively employing as sustainable inhibitors for the corrosion of different metals and alloys. Nevertheless, despite the numerous research papers, the reviews in which the correlation between the antioxidant/free radical scavenging activity of the extracts and their inhibition action is explained are not represented in the literature. This paper provides a brief overview of current knowledge in what kind of methods are used to estimate the antioxidant content, which classes of compounds provide higher antiradical activity and poses questions that we need to answer in order to use parameter of the antioxidant activity as a predictive index for performance evaluation of the plants/biomass wastes extracts as corrosion inhibitors. The conclusion is that no single mechanism of antioxidant actions and anticorrosive protection is operative in plant/wastes extracts. The high inhibitory efficiency is predicated on a number of complementary processes working holistically. By developing the theoretical basis and mechanism of action between the anticorrosive and antioxidant properties of plant extracts, it is possible to create predictive tools for selecting plant extract and further obtaining anti-corrosion protection based on it.

Section: Introductionmentioning

confidence: 99%

Relationship between the inhibition and antioxidant properties of the plant and biomass wastes extracts – A Review

Vorobyova¹,

Скіба²,

Shakun³

et al. 2019

“…Over the recent years, the use of naturally occurring substances of plant origin, otherwise called "green corrosion inhibitors" has received much more attention because they are incredible sources of natural organic compounds, which are environmentally acceptable, inexpensive, readily available and renewable sources of materials [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study of grape pomace extract and its active components as effective vapour phase corrosion inhibitor of mild steel

2018

The inhibition efficiency of grape pomace extract (GPE) and its main constituents (2-phenylacetaldehyde, hexanal) as a green volatile corrosion inhibitor for the temporary protection of mild steel was investigated. Weight loss measurements and potentiodynamic polarization techniques were all used for this assessment. The major constituents of GPE were identified by GC-MS analysis. Grape pomace extract inhibited mild steel corrosion under conditions of periodic condensation of moisture with a protection efficiency of ~92%. The gravimetric measurement indicates that inhibition efficiency shows direct proportional relation with concentration of inhibitor. The corrosion rate reduction is time dependent, and the highest protection values were achieved only in 48 h. Inhibition efficiency increases in the order: grape pomace extract > 2-phenylacetaldehyde > hexanal. The grape pomace extract and main components acted as a mixed-type inhibitor with predominant cathodic effectiveness. Structural characterization by using SEM, AFM images and FT-IR analysis further supported the electrochemical and weight loss measurements results obtained.

“…This result indicates that APE contains different classes of organic substances in their composition, which can act as corrosion inhibitors. [33,34]. The effect of 2-phenylacetaldehyde and hexanal on the corrosion behavior of steel was studied [35] through weight loss, electrochemical, SEM, AFM, quantum chemical calculation methods.…”

Section: Resultsmentioning

confidence: 99%

“…It was found that the inhibition effect of 2-phenylacetaldehyde was associated with layerby-layer mechanism formation of a protective film. Interestingly, the electrochemical and spectroscopic studies have revealed that unsaturated aldehydes (2-phenylacetaldehyde) and phenolic compounds (thymol and carvacrol) can polymerize on metallic surfaces and show excellent corrosion protection [33][34][35]. The antioxidant activity of the extract was analyzed in several methods because the evaluation of antioxidant properties of plants cannot be carried out accurately by a single universal method.…”

Section: Resultsmentioning

confidence: 99%

Apricot pomaces extract (Prunus Armeniaca L.) as a highly efficient sustainable corrosion inhibitor for mild steel in sodium chloride solution

Vorobyova¹,

Скіба²,

Трус³

2019

The present study was carried out to identify the components present in the ethanol apricot pomace extract by GC-MS analysis. Various experimental models including iron(III) reducing capacity, total antioxidant capacity, DPPH radical scavenging activity were used for characterization of antioxidant activity of the extract. Weight loss investigation, potentiodynamic polarization, and FTIR techniques were used to study the corrosion inhibition. The maximum inhibition efficiency of 94.6% was achieved by using 500 ppm of the inhibitor. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analysis were used to characterize the protective film. AFM also illustrated an improvement in the surface properties of the samples in the presence of APE. The influence of the immersion period on inhibition efficiency was evaluated. The GC-MS experimental results show that the major compounds of the APE are 3,4,5trihydroxybenzoic acid, chlorogenic acid, 3-(3,4-dihydroxyphenyl)-2-propenoic acid, 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one, and catechin. The results revealed that in the attendance of the APE and with the immersion time progress up to 48 h, the inhibition capacity of inhibitor was promoted.The mechanism of action of the inhibitor is also discussed. Quantum chemical parameters calculated for the molecules contained in the aqueous extract are interpreted to predict the corrosion inhibition efficiency of the considered extract. The theoretical study gave insights to the active sites, chemical reactivity and possible interaction mechanism between the inhibitor compounds and mild steel surface. The apricot pomace extract studied in this work are potential multifunctional inhibition materials as they showed good antioxidant and anticorrosion properties.