Corrosion Inhibition of Cu-Zn-Fe Alloy in Hydrochloric Acid Medium by Crude Ethanol Extracts from Roots-Leaves Synergy of Solanum melongena

Abstract

The corrosion inhibition of Cu-Zn-Fe alloy in hydrochloric acid medium by crude ethanol extracts from roots-leaves synergy of Solanum melongena have been studied with chemical methods (mass loss and gasometric methods). At 3.0 grams per litre concentration of the roots-leaves synergy of Solanum melongena, it was observed that a 98.8 % inhibition efficiency was recorded as corrosion rate of alloy was decreasing with inhibitor increase. Temperature evaluation on the inhibitor showed 99.2 > 88.4 > 85.6 % as trial was conducted from 303-323 respectively, and in respect to increasing concentration, corrosion rate was found to be 1.718 > 0.013, 0.0192 and 0.247 at 303, 313 and 323 respectively. All these present a good result for the synergistic inhibitor and a proof of its efficiency in controlling the corrosion of Cu-Zn-Fe alloy in hydrochloric acid medium. Inhibition mechanism was deduced from the activation and thermodynamic parameters that govern the process. Adsorption of extract on the Cu-Zn-Fe alloy was found to obey the Langmuir adsorption isotherm. The phenomenon of physical adsorption is proposed from the obtained thermodynamic parameters.

Computational and Electrochemical Study of Pyrantel as Alternative Green Corrosion Inhibitor of S275JR Mild Steel and 1100-H14 Aluminum Alloys in H2SO4 Acidic Environment

“…4 and 5a-b. It was observed that the inhibitor presented a single capacity loop for both S275JR -Mild steel and 1100 -Aluminum which is directed towards a single charge transfer [6,[15][16][17]. The sizes of these loops were observed to increases with the rise up to 2500 ppm which is in line with the increased charge transfer values indicating an adsorption of the inhibitor on both surfaces and a reduction of the exposed area (active sites) of the metal [10,15,16].…”

“…The values in Table 3 and 4 showed that the inhibition was highly significant at lower temperatures for both metals. This lower inhibition efficiency as recorded following increased temperature is likely to be the effect of temperature agitation on the corrosion inhibition process, consequent upon the loosely bonded inhibitor molecules at the metal interface [6][7][8][9]12]. The inhibition efficiency was found to be increasing following increased inhibitor concentration but decreasing with rise in temperature (Figs 2 and 3).…”

“…6a-b). Bode plots are useful in analyzing magnitude and phase changes introduce by a liner time invariant system through the controlled loop response [5][6][19][20][21][22]. Gains and phase margins represent the distance from the point at which instability could occur.…”

Corrosive Effect of Tomato, Pepper and Onion Pulps on Selected Grinding Machine Components

“…Generally, the results showed that stainless steel have the highest resistance to corrosion at the end of the experimental test followed by mild and then galvanized steel in the weight loss experiment. The decreasing trend of the corrosion rate of the galvanized steel with immersion time can be related to the formation of zinc salt of the organic acid which then reduces the concentration of the corroding media from acidic to alkalinity [13], and thus affecting the rate at which most or all of the atoms on the individual metal surfaces are oxidized and consequently damaged [10]. Galvanized steel when in contact with acidic foods is aggressively attacked by the acid species to yield zinc salts of the organic acids present.…”

“…Specifically, some corrosive metals can cause cancer after long-time exposure [9]. Consequently, considering the fact that metallic and environmental factors affect corrosion [10], the purpose of this study is to investigate the impacts of tomato, pepper, and onion pulps on various grinding machine components, such as stainless steel, mild steel, and galvanized steel.…”