Application of an Acid Extract of Barley Agro-Industrial Waste as a Corrosion Inhibitor for Stainless Steel AISI 304 in H2SO4

Abstract

Corrosion inhibitors are commonly used to reduce the effects of corrosive processes in metallic materials. However, many compounds are toxic and expensive and have negative effects on the environment. There is growing interest in replacing petroleum inhibitors with biodegradable inhibitors, such as plant extracts. Barley agro-industrial waste (AW) is a source of compounds with great inhibitor activity, and its use is desirable for minimizing the amount of AW. The aim of this paper is to demonstrate the application of an AW extract as a corrosion inhibitor for stainless steel AISI 304 in H 2 SO 4 . The efficiency of this acid extract was evaluated by weight loss measurements, scanning electron microscopy (SEM) analysis, open circuit potential (OCP) measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization curves (PP). The proposed extract exhibited an inhibition efficiency of up to 97% and was physically adsorbed in the metallic surface. The SEM images indicated that the addition of the extract decreased metal oxidation. The electrochemical results for steel in the presence of the AW extract acted as a mixed-type inhibitor, likely changing the cathodic mechanism reaction on the uncovered surface. The AW extract can thus be used as an organic corrosion inhibitor.

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

“…The increase of publication shows an exponential trend. Just in the past 2018, numerous naturally occurring products such as Nettle leaves [26], Red Algae Halopitys Incurvus [27], Prosopis juliflora [28], Barley Agro-Industrial Waste [29], Matricaria recutita chamomile [30], Rollinia occidentalis [31], Glycyrrhiza glabra leaves [32], Holoptele integrifolia leaf [33], Ginkgo leaf [34], Centaurea cyanus [35], Crataegus oxyacantha and Prunus avium plant [36], Pongamia Pinnata [37], Sida Cordifolia [38], Allium sativum (garlic extract) [39], Raphanus Sativus L. [40], Borago officinalis L. [41], Cuscuta reflexa [42], Mature areca nut husk [43], Pisum sativum peels [44], grape pomace [45][46][47], Artemisia Judaica Herbs [48], and Opuntia Ficus-Indica [49] have been evaluated as potential corrosion inhibitors. The increase in interest in green inhibitors has stroked the eager of many researchers round the globe to search for natural plant based inhibitors.…”

Principles and theories of green chemistry for corrosion science and engineering: design and application

“…Moreover, the surface analysis revealed that the specimens treated with nanosilicate exhibited smoother surfaces with fewer corrosion products than the untreated specimens. In a study conducted by Matos et al , 615 the potential of barley agro-industrial waste (AW) extract as a corrosion inhibitor for AISI 304 stainless steel in H 2 SO 4 was explored. The inhibitor demonstrated an impressive inhibition efficiency of 97%.…”

Study of the Electrochemical Behavior of Concrete‐Coated Steel in 1 M Sulfuric Acid Using an Extract of Diplotaxis simplex L.

“…Corrosion inhibitors represent a pragmatic approach to ameliorate the effects of corrosion. [1][2][3][4][5] These substances exert their protective action by partially obstructing the metal surface, often at minimal concentrations. Mechanisms of inhibition include chemical or physical adsorption, formation of protective oxide layers, or alteration of the corrosive environment.…”

“…Metal corrosion leads to significant economic losses and resource depletion. [1][2][3] Concurrently, it poses substantial safety risks and represents a potential threat to both human life and production. Consequently, the protection of metallic materials against corrosion has consistently been a central focus of research.…”