Introducing the Santolina chamaecyparissus Extract as a Suitable Green Inhibitor for 304 Stainless Steel Corrosion in St
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STAINLESS steels are employed in a variety of applications in both industrial and domestic environments and are generally defined as iron-based alloys containing at least 10.5 pct chromium and a maximum of 1.2 pct carbon. Typical areas of use include piping systems, heat exchangers, tanks and process vessels for the food, chemical, pharmaceutical, pulp and paper, and other industrial processes. Type 304 stainless steel belongs to the group of austenitic stainless steels.[1] Type 304 stainless steel is the important engineering and construction material in the world because of its excellent mechanical properties. Its important applications are in acid pickling, industrial cleaning, acid descaling, oil well acidizing, and petrochemical processes.[2] Although 304 SS has a wide range of applications, it is very susceptible to corrosion due to its thermodynamic instability, especially in acid medium. Hence, the study of 304 SS corrosion has invited the attention of researchers to investigate ways to control the corrosion particularly in acidic media. In industries, hydrochloric acid is extensively used for the removal of undesirable oxide films and corrosion products on the surface of steel.[3] Consequently, the control of the corrosion processes under the influence of MEHDI SHABANI-NOOSHABADI, Assistant Professor, and MARYAM-SADAT GHANDCHI, M.Sc. Student, are with the Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Islamic Republic of Iran. Contact e-mail: [email protected] Manuscript submitted March 1, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS A
acidic condition and the presence of chloride ions are important subjects worthy of intensive investigations. One of the most important and practical methods in the corrosion protection of metals is the use of organic inhibitors to protect the metal surface from the corrosion environment, especially in aggressive media.[3,4] The heterocyclic organic compounds containing O, S, and N atoms have good inhibition properties. However, they are toxic, expensive, and not environmentally safe. Hence, the use of eco-friendly corrosion inhibitors is increasing day by day. Some papers have reported the use of natural products in the development of effective green corrosion inhibitors for different metals in various environments.[5–12] The plant extracts such as Henna,[13] Oxandra asbecki,[14] Argemone mexicana,[15] Azadirachta indica,[16] Mentha pulegium,[17] Damsissa,[18] Ananas comosus,[19] Lasianthera africana,[20] Carica papaya,[21] Justicia gendarussa,[22] fruit peel,[23] Ferula gummosa,[24] Ephedra sarcocarpa,[25] and Calligonum comosum [26] were evaluated as effective corrosion inhibitors for steel in acid media. These plant extracts are low cost, nontoxic, readily available, and eco-friendly substances. Therefore, finding natural substances as corrosion inhibitors is an important and practical subject. The literature study reveals that medicinal plant extracts were generally rich in flavanoids, alkaloids, polyphenols, and other
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