Paederia Foetida leaves extract as a green corrosion inhibitor for mild steel in hydrochloric acid solution

Abstract

Corrosion has adverse effects on machines and structures to deteriorate their working properties. Because of this, billions of dollars are wasted every year from an industrial point of view. The conventional strategies used to protect the metals and alloys from corrosion are harmful to both human health environment. Green corrosion inhibitors are considered as an alternative approach to resolving this problem. In this study, Paederia Foetida leaves extract is used as a green corrosion inhibitor along with mild steel as a sample and 1 ​M hydrochloric acid as an acid solution. The inhibited solution is prepared by mixing the Paederia Foetida leaves extract with hydrochloric acid. Mild steel samples are immersed in both inhibited and uninhibited solutions for the duration of 3, 5, and 7 days. The corrosion efficiency is calculated by the weight loss method and the maximum inhibition efficiency is obtained 73.77% after 3 days in presence of green inhibitor. The FTIR spectroscopy test reveals that the adsorbed protective layer formed on a mild steel surface after immersion in inhibited solution. The SEM morphology indicates that the less corrosive surface of mild steel when a green inhibitor is present. This is due to the formation of protective biofilm on the surface of the mild steel surface by the physical adsorption process. Surface topography and particle analysis are also performed and the results obtained from these analyses are confirmed by the SEM mechanism. Moreover, the mechanism of inhibition is explained possible chemical reactions.