• Abraham Yerinmearede Erebugha
• Kennedy Chinedu Owuama
• Joseph Okechukwu Ezeugo

Inhibitive effect of Dennettia tripetala (DT) (pepper fruit) extract on corrosion of aluminum in 0.5 M H2SO4 medium was investigated. The pepper fruits were obtained from Egbudu market, Warri and was processed to powder. Phytochemical analysis was carried out using quantitative and qualitative methods respectively. Fourier Transform Infra-Red (FTIR) spectroscopy was carried out to determine the functional groups of the phytochemicals. Gravimetric (weight loss) and electrochemical techniques was used for the corrosion study within a temperature range of 303 to 323K. The results from the phytochemicals analysis revealed the presence of alkaloids, flavonoids, phenols, saponins, tannins, steroids, phytates and glycoside. The gravimetric studies revealed that inhibition efficiency increased from 62.3% to 95.5% with increasing concentration of extracts from 200mg/l to 1000mg/l. Activation energy increased from 36.019 KJ/Mol to 59.628KJ/Mol as inhibitor concentration increased from 0.45 to 1.20g/L indicating the difficulty of corrosion to take place and also free energy reduced from -18.689 KJ/Mol to -26.592KJ/Mol for the same concentration of the inhibitor. The electrochemical impedance study gave a convincing proof, that corrosion inhibition of aluminum in acid medium takes place through adsorption process that occurs on the surface. Polarization curve measurements really indicate that the studied extract showed to be a mixed type inhibitor. The increasing value of constant phase elementl exponent, that is, the phase shift (n) with increasing inhibitor concentration indicated that surface roughness decreased with increasing inhibitor concentration which is also seen in the scanning electron microscopy. The adsorption of DT extracts in acid aenvironment on aluminum obey Langmuir adsorption isotherm since it is the isotherm that gave the best fit for the experimental data. SEM confirms the existence of film coating layer on the metal solution interface. It was observed that bio-sourced plant extract, Dennattia Tripatalla (DT) is very effective as green corrosion inhibitor for aluminum in acidic medium

Dennattia Trapettallia, inhibitive effect, pepper fruit, egbudu market, aluminum corrosion

"STUDY OF THE INHIBITIVE EFFECT OF DENNATTIA TRIPATTALLA ON ALUMINUM IN TETRA OXO SULPHATE ACID MEDIUM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 10, page no.e635-e646, October-2021, Available :http://www.jetir.org/papers/JETIR2110494.pdf

"STUDY OF THE INHIBITIVE EFFECT OF DENNATTIA TRIPATTALLA ON ALUMINUM IN TETRA OXO SULPHATE ACID MEDIUM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 10, page no. ppe635-e646, October-2021, Available at : http://www.jetir.org/papers/JETIR2110494.pdf