The inhibitory action of Bauhinia purpurea extracts on the corrosion of carbon steel in sulfuric acid medium

Abstract

The inhibitory effect of Bauhinia purpurea (Fabaceae) extract was studied in the corrosion of carbon steel in 1.0 mol•L -1 sulfuric acid solution. This plant was collected from the Brazilian rainforest. The carbon steel protection was observed by varying the extract concentration from 50 to 500 mg•L -1 . Polarization curves revealed that this extract acted as an adsorption inhibitor decreasing both anodic and cathodic density currents. Weight loss measurements showed that the extract remains stable for at least 72 hours. The adsorption process of this extract obeyed the Langmuir adsorption isotherm. Lastly, Arrhenius plot suggested the physical adsorption of the extract.

Application of an Aqueous Extract of Cotton Seed as a Corrosion Inhibitor for Mild Steel in HCl Media

“…The gravimetric measurements have been detailed in our previous works [7][8][9][10][11][12][13][14][15][16] . Initially, the weight loss measurements were performed with different immersion times (2, 4 and 24 h) and varying the concentrations of the extract in 100, 200, 400 and 800 mg L −1 .…”

“…However, some synthetic compounds can result in environmental damage, increasing the risk to human health. New biodegradable, inexpensive, and environmentally friendly products have been used for corrosion control [4][5][6][7][8][9][10][11][12][13] .…”

Adsorption and Corrosion Inhibition of Cactus cladode Extract and Effect of KI Addition on Mild Steel in 0.5 M H2SO4

“…The capacitive loop observed at high frequencies corresponds to charge transfer resistance and double layer resistance. The total resistance additionally contains film resistance in the presence of the extract [50] . The diameter of this capacitive loop in the presence of CC extract is bigger than that in the uninhibited solution, which increases with the CC extract concentration.…”

The Inhibitory Action of Aniba Canelilla (H. B. K.) Mez. Extracts on the Corrosion of Carbon Steel in Hydrochloric Acid Medium

“…The protective efficiency appears to increase with the presence of oxygen, nitrogen, sulfur and π electrons in organic compounds that makes natural products a promising source. [1][2][3][4][5] Apparently, the inhibition efficiency is linked to the polar functions that act as the reaction center of the adsorption process. 6 The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion products as they are biodegradable and do not contain heavy metals nor toxic compounds.…”