Carrot (Daucus Carota L.) Peels Extract as an Herbal Corrosion Inhibitor for Mild Steel in 1M HCl Solution

Abstract

The inhibition of corrosion on mild steel in 1M HCl solution was evaluated by utilizing carrot (Daucus carota L.) peels (CP) extract. Study performed by gravimetric and Potentiodynamic polarization techniques. Various concentrations of CP extracts ranging from 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 (v/v) were used and corrosion rate (CR) on mild steel and inhibition efficiency (IE) were investigated at three temperatures (298K, 308K, and 323K). Corrosion rate increase with the increase in temperature. As inhibitor concentration increases, corrosion rate decreases and IE decreases at elevated temperature. The substantial reduction in CR with the increase in the concentration of CP extract was noted at studied temperatures. However, the increase in the CR at each CP extract along with the increase in the temperature tallied to the increase in kinetic activities at the electrolyte and metal interface. Results show that with the increase of 0.5 g/l CP extract, about 3 times lower CR of mild steel at studied temperatures than in pure 1M HCl solution affirm its robust inhibitive efficiency. Comparatively large change in the anodic Tafel slope and gradual decline in CR with an increase in the CP extract concentration confirmed the restricted dissolution of mild steel. Surface examination suggest that a layer of inhibitor material adsorbed on the surface of mild steel at low temperature is responsible for high IE and this phenomenon is characterized as chemisorption. Weight loss data used to test three well known adsorption isotherm Langmuir, Temkin and Freundlich models and found that data is fitted well to all the models to certain extent however Freundlich Isotherm is found to be best fitted with as the correlation coefficient (R2) values reaching to unity, which showed the applicability of the models to the process.

The Use of Citrullus Lanatusfor Corrosion Inhibition of A36 Steel in a CO2Saturated Saline Solution: A Thermodynamic and Kinetic Model Approach

“…Generally, at low pH, increase in Temperature increases the precipitation of Hydrogen Ion which is unfavourabe for the protective film covering but at high pH, increase in Temperature increases the formation, density and insolubility of the Iron Carbonate layer which provides the protective film covering on the metal surface (Durowaye et al, 2014) Oluyori et al, 2020). Observation similar to this was also reported by (Tariq Saeed et al, 2020). Furthermore, a closer observation of the result shows that there was a progressive decrease of Corrosion rate (0.198mm/hr to 0.168mm/hr) as the inhibitor concentration increases from 50mg/L to 100mg/L and almost became steady at 150mg/L, then, the corrosion rate increased when the Inhibitor Concentration was increased further to 200mg/L.…”

A Study on Microbe-Metal interaction: Aluminium Alloy (6061) and Bacillus sp in simulated Marine environment

“…The corrosion resistant behavior of the metal coupon might be because the test medium and the bacterial strain was less reactive towards the metal. The process may be slow and it may take longer period for the degradation [25].…”