Abstract
The ability of gum exudates ofAzadirachta indica(GAI) to inhibit corrosion on mild steel in 1 mol L−1HCl has been studied using mass loss, polarization, and impedence measurements. The effect of temperature (303–323 K) and immersion time of 1, 2, 4, 6, and 12 hours on corrosion behavior of mild steel was examined. Gum exudates decrease the corrosion rate up to a concentration of 80 ppm and at 323 K temperature. GAI adsorb chemically onto the surface of the mild steel while it obeys Langmuir adsorption isotherms. Polarization studies show GAI as mixed mode inhibitor. Surface studies ascertain that a shielding layer was formed on the mild steel surface.
Highlights
Mild steel corrosion is a subject of incredible theoretical and practical interest and as such has received extensive attention
Analysis of data in the table reveals that the rise in the concentration of the inhibitor from 10 ppm to 60 ppm increased the inhibition efficiency and the highest inhibition efficiency was achieved at 60 ppm for various immersion periods at the studied temperature range (303–323 K)
The corrosion inhibition action primarily owes to gum exudates of Azadirachta indica (GAI) accumulating on the surface of mild steel which reduces the interaction between mild steel surface and aggressive medium
Summary
Mild steel corrosion is a subject of incredible theoretical and practical interest and as such has received extensive attention. Plant origin substances form an excellent kind of inhibitors because of their wide abundance, easy availability, low toxicity, biodegradability, and cost-effective nature. In our attempt to explore environmentally safe green inhibitors, Advances in Physical Chemistry gum exudates of Azadirachta indica were used to investigate the corrosion behavior of mild steel in 1 M HCl solution. We have already reported the corrosion inhibition performance of Azadirachta indica gum on mild steel in the acidic medium [24] and its synergistic effect between GAI and substituted piperidones [25]. In our continuous quest for exploring stable corrosion inhibitors for longer immersion time, the present work reports on the influence of time on corrosion inhibition of mild steel in 1 M HCl medium using Azadirachta indica gum
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