Assessment on the Effective Green-Based Nepal Origin Plants Extract as Corrosion Inhibitor for Mild Steel in Bioethanol and its Blend

Abstract

Effects of Nepal origin plant species of Vitex negundo, Catharanthus roseu, Aegle marmelos and Elaeocarpus ganitrus extracts on mild steel corrosion were explored in bioethanol (E100) and its blend (E15) in airtight condition at 25±2 °C using static immersion, inhibition efficiency and mechanism tests which were complemented with adsorption isotherms and potentiodynamic polarization studies. Corrosion resistance of the mild steel was increased with increasing 500-2000 ppm concentrations of each plant extract in E100 and E15 biofuels. Additions of V. negundo and C. roseus extract separately in both the biofuels seems to be more effective inhibition actions to prevent the mild steel corrosion than A. marmelos or E. ganitrus addition so as the corrosion rates of the mild steel in E100 and E15 are successfully lowered even than in commercial gasoline (E0). The results obtained from the corrosion rate revealed the order of the corrosion inhibition efficiency (IE) as V. negundo > C. roseus > A. marmelos > E. ganitrus. The maximum IE (IEmax) in V. negundo and C. roseus leaves was showed about 89-86% and 71-75%, respectively, at 2000 ppm concentration, in spite of the other two more plants leaf extract also used as the corrosion inhibitors for the mild steel in both E100 and E15 biofuels. The IE increased on increasing inhibitor concentration following the Langmuir and Temkin adsorption isotherms but decreased with immersion time which suggested that the corrosion inhibition mechanism is of physical type of adsorption of the leaves constituents on the mild steel surface. A. marmelos extract acted as an anodic type of inhibitor in E100 and E15, while E. ganitrus acted as mixed

Study on the effects of green-based plant extracts and water-proofers as anti-corrosion agents for steel-reinforced concrete slabs

“…6(c) and 6(d) show that both the plants' extracts have the same degree of corrosion inhibiting actions to the steel rebars in concrete slabs at 1000, 2000, and 4000 ppm concentrations, which is a slightly lower inhibiting level than by 500-1000 ppm Vitex negundo, and slightly higher inhibiting actions than of 500 ppm Catharanthus roseus extract. Such result is in agreement with the previously reported works that anti-corrosion properties of the methanolic extract of Vitex negundo leaves to mild steel in biofuels reported higher than of the Catharanthus roseus extract due to the formation of stable and diffusion-barrier passive film from the potentiodynamic measurements [36]. Such high anti-corrosion effect to the steel rebars in concrete slabs by low concentrations (i.e., 500 & 1000 ppm) of the Vitex negundo extract compared with the Catharanthus roseus extract could be accredited to have high amounts of phytoconstituents in the Vitex negundo extract than Catharanthus roseus extract.…”

“…Moreover, the effects of Nepal origin plant species of Vitex negundo and Catharanthus roseus extracts on mild steel corrosion in different bioethanol fuels studied using corrosion, adsorption isotherm, and potentiodynamic polarization tests. The results revealed that the maximum inhibition efficiency reported about 89-86 and 71-75 % in V. negundo and C. roseus leaves, respectively, at 2000 ppm [36]. Many researchers have studied the reasons, control strategies, and techniques for such concrete corrosion calamities recently, though very little research works on the assessment of corrosion degree of some reinforcement concrete infrastructures used in the Kathmandu Valley [37], and Pokhara Valley [38] of Nepal.…”

Performance of Anticorrosive Measures of Steel in Concrete Infrastructure by Plant‐Based Extracts

“…[ 14–16 ] Even though few research works were carried out last two decades on the effects of green corrosion inhibitors extracted from plants on various metals in the aqueous system [ 17–19 ] and biofuels. [ 20–22 ]…”

A comparative study of the anticorrosive response ofTinospora cordifoliastem extract for Al and Cu in biodiesel-based fuels

“…Biodiesel has been mandated for its usage in a blending range of up to 20% with petroleum diesel all over the world [9], although there are some challenges to making such greener BDBFs into reality. In comparison to petroleum diesel, the BDBFs are more corrosive to the engine parts of transportation means and the fuel storage systems [10,11], which are mostly fabricated by steel, cast iron, aluminum, copper so on [12]. There is a growing trend to replace steel and cast iron with Al and Cu metals, and their alloys in vehicle engines and fuel storage systems in recent decades [13].…”