Effect of Acidified Feronia elephantum Leaf Extract on the Corrosion Behavior of Mild Steel
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ACID solutions play a vital role in various industrial processes such as acid pickling, acid descaling, acid cleaning, and oil wet cleaning.[1] They are extremely corrosive to mild steel. One way of protecting mild steel from corrosion is the use of organic inhibitors.[2] The role of inhibitors is to form a barrier of one or several molecular layers against the acid attack. Several studies[3–8] have been published on the use of natural products as corrosion inhibitors in different media. Most of the natural products are non toxic, biodegradable, and readily available in plenty. Various parts of plant seeds,[9,10] fruits,[11] leaves,[12–14] and flowers[15–18] have been extracted and used as corrosion inhibitors. Currently, naturally occurring organic molecules exhibiting a strong affinity for metal surfaces are the focal point of research oriented toward the development of environmentally friendly corrosion inhibitors which show good inhibition efficiency and low environmental PITCHAIPILLAI MUTHUKRISHNAN and KARIKALAN SHANKAR, Assistant Professors, are with the Department of chemistry, Faculty of Engineering, Karpagam University, Coimbatore 641021, Tamil Nadu, India. Contact e-mail: [email protected] PERIAKARUPPAN PRAKASH, Assistant Professor, is with the Post Graduate and Research Department of Chemistry, Thiagarajar College, Madurai 625009, Tamil Nadu, India. MURUGAN ILAYARAJA, Associate Professor, is with the Department of Chemistry, SBM college of Engineering and Technology, Dindigul 624 005, Tamil Nadu, India. BALASUBRAMANIAN JEYAPRABHA, Assistant Professor, is with the Department of Civil Engineering, Fatima Michael College of Engineering and Technology, Madurai 625020, Tamil Nadu, India. Manuscript submitted August 18, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS B
risk. Lorenz and Mansfeld[19] classified the modes of inhibition effect of interface inhibitors into three classes: (i) The geometric blocking effect of adsorbed inhibitive species on the metal surface. (ii) The effect of blocking the active sites on the metal surface by absorbed inhibitive species. (iii) The electro catalytic effects of the inhibitor and its reaction products. Most of the efficient inhibitors used in industries are organic compounds which mainly contain nitrogen, sulfur, oxygen atoms, and multiple bonds in the molecule which donate a lone pair of electrons to the unoccupied orbits of the metal atom. Stable and strong bonds are formed between the inhibitor and the metal surface during the self-assembling process.[20,21] It has been observed that absorption of organic inhibitor depends on the physico-chemical properties of the functional groups and the electron density of the donor atom.[22] The choice of the inhibitors is based primarily on two considerations: (i) They can be synthesized easily from inexpensive material. (ii) The presence of an electron cloud on the aromatic ring, the electronegative nitrogen, oxygen atoms, and the presence of a CN group on steel surface prompting effective inhibition[23] Feronia elephantum is one of t
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