Aqueous extract of Dillenia Pentagyna Fruit as green inhibitor for mild steel corrosion in 0.5 M hydrochloric acid solution

An aqueous extract of Dillenia pentagyna Fruits (DPF) was studied as corrosion inhibitor on mild steel in 0.5 M hydrochloric acid using conventional weight loss method and electrochemical methods. The increase of corrosion rate on mild steel is influenced by the increase of temperature and decrease of DPF concentration. The efficiency of Corrosion Inhibition increases with increase of extract concentration. The adsorption of DPF extract on mild steel surface is associated with Langmuir adsorption isotherm. Electrochemical measurement shows that DPF extract behaves as mixed type inhibitor. The protective nature of DPF extract on mild steel film is reflected by Scanning electron microscope images.