International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 |Feb -2017
p-ISSN: 2395-0072
www.irjet.net
Predictive Model for Corrosion Inhibition of Mild Steel in HCl by Crushed Leaves of Clerodendrum Splendens Agha Inya Ndukwe1 and C. N. Anyakwo2
1. Department of Metallurgical Engineering Technology, Akanu Ibiam Federal Polytechnic Unwana, P.M.B. 1007, Afikpo, Nigeria. 2. Department of Materials and Metallurgical Engineering, Federal University of Technology, P.M.B. 1526, Owerri, Nigeria. ---------------------------------------------------------------------***--------------------------------------------------------------------1. INTRODUCTION Abstract - The corrosion inhibition of mild steel in 0.7M, Corrosion is the destructive attack of a metal by 1.2M and 2.2M HCl by thoroughly crushed leaves of Clerodendrum Splendens has been studied using the weightchemical or electrochemical reaction with its loss technique. The corrosion rate curves were observed to environment [1]. When a metal interacts with the continuously decrease with time whilst the inhibition efficiency environment, the tendency of the metal to revert to its improved as the experimentation progressed. For the entire original state where it was in combination with other study environment, the highest inhibition efficiency of 70.70% elements is imminent. The overall outcome of was achieved when the thoroughly crushed leaves of corrosion as acknowledged by [2] is that a metal Clerodendrum Splendens were added at 45g per litre of 1.2M undergoes an electrochemical reaction as a result of its HCl while the corrosion rate reduced from 0.6738mgcm-2h-1 to surrounding to form a compound similar to the one 0.2465mgcm-2h-1. The predictive corrosion rate model was from which it was won. The destructive effect of a developed using multiple regression and artificial neural metal has huge financial toll running into billions. For network. The prediction of the experimental corrosion rate by the artificial neural network revealed the importance of instance, the total annual corrosion cost in the US rose independent variables; (time (h), concentration of acid (M) from $276 billion in 1998 to above $1 trillion in the and quantity of crushed leaves (g)) in the prediction of the middle of 2013 and is now estimated at $1.1 trillion for dependent variable (Corrosion rate, CR (mgcm -2h-1). The 2016 [3]. addition of the crushed leaves of Clerodendrum Splendens to The addition of an inhibitor is one of the the hydrochloric acid induced corrosion of mild steel indicates techniques used to prevent corrosion. Inhibitors are that the time of exposure vastly influenced the prediction of substances that prevent the corrosion of metals and the corrosion rate by 47.7%, followed by the quantity of alloys when added in minute quantity to the corrodent. pounded leaves, 26.6% and finally the concentration of acid, This may be achieved by lowering anodic or cathodic 25.7%. Predictions by the artificial neural network gave a reaction rates or both simultaneously [2]. One of such minimal error and were closer to the experimental corrosion rate values in comparison with the predictions by multiple substances often used as an inhibitor is chromate regression. The protective film formed on the mild steel which is toxic and carcinogenic [1]. The toxicity effect surface was analyzed by FTIR spectroscopy and Scanning of the known synthesized inhibitors has driven electron microscopy (SEM). The FTIR analysis indicates that contemporary studies towards the use of plant extracts the adsorbed constituents of the crushed fresh leaves of as anti-corrosion agents, because they are mostly Clerodendrum Splendens on the surface of mild steel, harmless. immersed at 30g per litre of 0.7M HCl for eight hours is Green inhibitors like natural products from associated with the stretching vibrations of O–H, C≡C and C=C plant extracts and substances from other renewable bonds. The SEM image shows that corrosion was localized on sources are of the interest of researchers who are the surface of mild steel when immersed in the uninhibited desirous of green chemistry or eco-friendly solution of 0.7M HCl but the addition of Clerodendrum Splenden’s pounded fresh leaves at 30g per litre of 0.7M clearly technologies [4]. This research examines the leaves of inhibited the mild steel from corrosion. The phytochemical Clerodendrum Splendens as a veritable candidate for analysis of the leaves of Clerodendrum Splendens reveals the the inhibition of mild steel in hydrochloric acid. presence of alkanoid, tannin, saponin, phytate, flavonoid and Clerodendrum Splendens (Verbenaceae) is a woody or phenol. semi-woody evergreen vine or running shrub to 12ft (3.7m) long that climbs by twining. The leaves are oval Key Words: Inhibition efficiency, Hydrochloric acid, to 7in (18cm) long and arranged in opposite pairs [5]. Corrosion rate, Clerodendrum Splendens, Artificial eural network, Multiple regression. Inhibitors have always been considered to be the first line of defence against corrosion in various industries. A great number of scientific studies have been devoted to the subject of corrosion inhibitors but © 2017, IRJET
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