OPTIMIZATION AND EFFECT OF INHIBITIVE ACTION OF VERNONIA AMYGDALINA AND AZADIRACHA INDICA LEAVE EXTRACTS ON CORROSION OF MILD STEEL IN ACIDIC MEDIUM: AN INNOVATIVE APPROCH

Abstract

The major process parameters of plant extracts of Veroninia Amigdanina and Azadirachta Indica on mild steel corrosion in acidic medium (HCL) were investigated by the weight loss technique and optimized using the central composite design (CCD) of response surface approach (RSM).The elemental compositions of metal were determined using an Atomic Absorption Spectrophotometer(AAS).Phytochemical analysis results confirmed the presence of organic constituents such as Alkaloids, Tannins, Terpenes, Glycosides, Saponins, and Flavonoids, which made the Veroninia Amigdanina and Azadirachta Indica plant extracts act as a good inhibitor and functional groups using ASTM International and a Fourier Infrared Spectrometer, respectively. The result of system variables such as inhibitor concentration, time, effect of temperature and medium concentration on corrosion rate in an acidic (HCL) medium was studied. The results show that iron is the main component of mild steel, and that a lack of phytochemical components and functional groups in the extracts makes them effective inhibitors. The highest inhibition efficiency was 95.1 percent, temperature: 47.90C, inhibitor concentration: 18.84mgmol, time 5.55s, medium concentration 1.67mgmol, and 83.9 percent, temperature: 47.30C, inhibitor concentration: 12.10 mgmol, time 7.50s, according to studies from the experimental design of Veroninia Amigdanina and Azadirachta Indica. Within Veroninia Amigdanina and Azadirachta Indica inhibited acid media, the best feasible conditions yielded inhibition efficiency of 96.2 percent and 84.85 percent, respectively. This suggests that Veroninia Amigdanina and Azadirachta Indica leaf extracts can help.