Synergistic Influence of Halide Ions on Corrosion Inhibition Performance of Gum Exudates of Azadirachta indica on Carbon Steel in Sulphuric Acid Medium (original) (raw)

2018, Asian Journal of Chemistry

Carbon steel finds extensive use in oil refineries, distillation plants petrochemical industries, power plants, gas refineries and ships due to its high strength, low cost and easy accessibility [1]. Nevertheless, a huge problem towards application part of carbon steel is its corrosion especially in acid media. Steel corrosion in acidic medium can be minimized through several approaches. Use of synthetic organic and inorganic compounds as corrosion inhibitors is the well-established method but is much expensive and non-biodegradable. To prevail with the condition, bountiful number of corrosion research studies were done using extracts of different parts of plants, natural products, drugs and biopolymers. Some investigations of gum exudates of trees reported as good inhibitors made in the recent past include gum arabic [2], locust bean gum [3], guar gum [4], albizia gum [5], Raphia hookeri exudate gum [6], Dacryodes edulis gum [7], Ficus glumosa gum [8], Commiphora kerstingii gum [9], Ficus benjamina gum [10], Anogeissus leiocarpus gum [11], Commiphora pendunculata gum [12], Ficus platyphylla gum [13], Ficus trichopoda gum [14], Gloriosa superba gum [15], Khaya ivorensis gum [16], Ficus thonningii gum [17] and Daniella oliveri gum [18]. In general, to improve efficiency of naturally occurring substances, a small addition of halide ions are employed [19-21]. We had reported earlier the use of Azadirachta indica gum for mild steel corrosion in hydrochloric