IMPACT OF NEEM (DOGONYARO) LEAVE EXTRACT AS A GREEN INHIBITOR TO CONTROL CORROSION OF MILD STEEL IN HCl ACID MEDIUM

Abstract

The major process parameters of leaf extract of Neem (Dogonyaro) on mild steel corrosion in acidic medium (HCL) was investigated by the weight loss technique and optimized using the  response surface approach (RSM).The elemental compositions of metal were determined using an Atomic Absorption Spectrophotometer(AAS). Phytochemical analysis was investigated to confirm the presence of organic constituents such as Alkaloids, Tannins, Terpenes, Glycosides, Saponins, and Flavonoids, which made the neem leaf extract act as a good inhibitor. The effect of the parameters such as inhibitor concentration, time, effect of temperature and medium concentration on corrosion rate in an acidic (HCL) medium was investigated. The results show that iron is the main component of mild steel, and that the presence of phytochemical components and functional groups in the extract makes it effective inhibitor. The optimal inhibition efficiency was 83.9 percent  temperature: 47.3⁰C, inhibitor concentration: 12.10 mg/mol, time 7.50s, according to studies from the experimental design of neem. Within neem inhibited acid media, the best feasible conditions yielded inhibition efficiency of 84.85 percent, respectively. This suggests that Neem leaf extract is a good inhibitor.