Abstract
Recently, there is quest for the use of inexpensive, non-toxic, non-biodegradable, readily available and environmentally acceptable corrosion inhibitor. Studies have shown that these properties could be achieved through the use of plants as inhibitor. Inhibiting effect of Prosopis Africana (Iron Tree) seed extracts were assessed on a sample of low carbon steel in 1M HCl with varying proportion of the seed extract using gravimetric, Tafel polarization and gasometrical measurement techniques. The results show that weight loss/corrosion rate decreases with increase in the extracts’ concentrations. Good inhibiting efficiency of Prosopis Africana extracts with optimum inhibiting efficiency of 97.7% at 1.0 g/l after 120 hours exposure in gravimetric measurement was attained. TAFEL polarization results revealed that the Prosopis Africana extract shows that the corrosion current density decreases with the increase in the concentration of the extract. The extract is found suitable as green inhibitor for corrosion of low carbon steel in the studied medium.
Highlights
Low carbon steel is a popular metal that has a wide range of applications due to its availability and excellent mechanical properties [1,2]
The aim of this study is to investigate the corrosion potential of the Prosopis Africana seed extract (PASE) and establish the possible efficiency it could offer as low carbon steel corrosion inhibitor in hydrochloric acid (HCl) medium
2 METHODOLOGY 2.1 Sample Preparation The elemental composition of the low carbon steel as shown in Table 1 was determined at Midwal Engineering Service Limited, Lagos using Spectromaxx LMF06 Spectrometer Machine (Serial Number: 15007384).The sample was prepared in accordance with ASTM G1-03 & G4 guidelines [23, 24]
Summary
Low carbon steel is a popular metal that has a wide range of applications due to its availability and excellent mechanical properties [1,2]. Low carbon steel is much prone to corrosion when exposed to acidic or basic environment [3]. Corrosion is a natural process that cannot be totally prevented, but it can be minimized or controlled by proper selection of materials, design, coating and application of inhibitors [5]. Corrosion inhibitors are used to protect metals by adsorption from corrosion attack. Some of these inhibitors are synthetic in nature and not eco-friendly because of the toxic product released to the environment after usage [6]. It has been established that most of the efficient inhibitors are organic compounds that contain in their structures mostly nitrogen, sulphur or oxygen atoms that create barrier to corrosion attack on the metal surface [7]
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