A Review on Plants and Biomass Wastes as Organic Green Corrosion Inhibitors for Mild Steel in Acidic Environment

Abstract

Acid corrosion is a problem pertaining to corrosion that involves an acid solution. It is important to treat metal to preserve its integrity. Thus, acids are utilized to clean and treat metal surfaces. In return, this may lead to over-etching and metal degradation. Corrosion inhibitors were introduced as a solution for the issue. However, there are some problems associated with the usage of conventional corrosion inhibitors. Traces of nitrites and chromates that are present in the inhibitors may lead to serious health and environmental issues. As a solution, organic green corrosion inhibitors have been studied to replace the conventional corrosion inhibitors. These inhibitor molecules form a protective layer on top of the metal surface to suppress metal dissolution when added to the acid solution. This process prevents direct contact between the metal surfaces and the acid environment. This study explores the usage of natural resources and biomass wastes as the basis for organic green corrosion inhibitors. This study also provides some suggestions for new biomass wastes that can be studied as new organic corrosion inhibitors, and it is aimed at opening the perspective of researchers on exploring new organic inhibitors by using natural resources and biomass wastes.

Corrosion inhibition and thermodynamic studies on carbon steel in well water by ethanolic extract of Alpinia officinarum leaves (Lesser galangal)-Zn2+

“…Therefore, the IE is increased and CR is also reduced, when the concentration of combined inhibitor (AO-Zn 2+ ) system is increased (30,40) . https://www.indjst.org/ Anodic reaction (28,41) : Fe → Fe 2+ + 2e − Cathodic reaction (41) :…”

“…CS was immersed in well water with various concentrations of AO leaves at 303K. After one day of immersion, CS samples were collected, washed with tap water, dried and gauged to determine the IE (27,28) and CR (28)(29)(30) using the following equations:…”

“…When the IE value is 100%, the surface coverage value should be unity (28) . θ = IE 100 https://www.indjst.org/…”

“…Result of thermodynamic parameters are given in Table 7 . The ∆G ads (53,61) , q ads (27) and ∆S ads (4,28,58) values are calculated using the following equations.…”

Review on the Recent Development of Fatty Hydrazide as Corrosion Inhibitor in Acidic Medium: Experimental and Theoretical Approaches

“…A study by Kadhum et al [22] in 2021 revealed that considerable improvements in corrosion resistance of up to 80% were observed when using organic compounds as corrosion inhibitors. Recent review studies by Reza et al [23] and Yang [24] also discussed various types of organic corrosion inhibitors for mild steel application, which show excellent performance up to 90% in the acidic environment. Other beneficial properties of organic compounds include high inhibition effectiveness, cost-effectivity, ease of application and synthesis, and being more environmentally friendly than inorganic compounds [25,26].…”