Terminalia arjuna leaves extract as green corrosion inhibitor for mild steel in HCl solution

Corrosion causes devastating damage to our machines and structures making the waste billions of dollars. Finding a proper solution to get rid of this problem is in high demand. Synthetic inhibitors are used to solve this problem but it is harmful to the environment. Stainless steel is also made which is too costly. Tremendous research is going on around the world to invent an efficient natural inhibitor. Terminalia arjuna has been used as medicine for the treatment of various diseases. In this paper, we tried to find its efficiency as a corrosion inhibitor where mild steel has been used as a specimen. It shows a maximum of 64.1% efficiency in a 0.2 M HCl medium which can further be improved by improving the experimental conditions. Fourier-transform infrared spectroscopy test suggests the reasons behind the inhibitions. Scanning electron microscopy test shows the surface morphology of the corroded samples and confirms less corrosion effect on mild steel in inhibited solution.