Experimental and Theoretical Approach on the Enhanced Inhibitory Effect of Tetracyclic Triterpenes for Stainless Steel C
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DUCTION
STAINLESS steel is often considered an economical and practical material for a variety of applications.[1] In particular, it is mainly used in the chemical industry in many aggressive environments, namely petroleum refining, chemical processes, and desalination.[1,2] The corrosion resistance of stainless steel is attributed to the presence of a thin protective passive film covering the surface. It is mainly composed of a mixed oxide of chromium and iron, providing excellent corrosion resistance in different aggressive environments.[3] However,
YASSINE KOUMYA, RACHID IDOUHLI, ABDESSELAM ABOUELFIDA, and ABDELAZIZ BENYAICH are with the Physical Chemistry of Materials and Environment Laboratory, Faculty of Science Semlalia, Cadi Ayyad University, BP 40000, Marrakech, Morocco. Contact e-mail: [email protected] AHLAM SAYOUT and ABDERRAHMANE ROMANE are with the Applied Chemistry Laboratory, Department of Chemistry, Faculty of Science Semlalia, Cadi Ayyad University, BP 2390, Marrakech, Morocco. Manuscript submitted November 23, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
in some cases, corrosion-resistant stainless steels have been found to lose their properties, especially in acidic media. In particular, sulfuric acid has numerous applications, covering almost all industries, such as the fertilizer industry, petroleum refinery, paint industry, steel pickling, nonmetal extraction, etc.[4] Therefore, the search for and application of new high-efficiency corrosion inhibitors has become an obligation to prevent corrosion of stainless steel in acidic media.[5] In addition, the use of organic inhibitors is one of the most practical ways to protect metals and alloys from corrosion. In the past few years, the exploration of natural substances has become a key source of new eco-friendly corrosion inhibitors. They are environmentally friendly, ecologically acceptable, low-cost, readily available, and renewable sources of materials.[6] Heterocyclic molecules containing polar groups and p-electrons have proven to be very effective. These compounds are considered to be effective inhibitors for their ability to establish adsorption on metal surfaces. Due to the numerous uses of heterocyclic molecules, their chemical properties have not ceased to develop on synthetic plants. In particular, triterpenes are the most abundant and diverse species of plant natural products.[7]
According to Benharref et al.,[5,6] Euphorbia genus includes a broad and diverse group of plants characterized by the presence of irritating latex rich in euphol and euphorbol tetracyclic triterpenes. This study investigated the effect of triterpene fraction (TF) isolated from Euphorbia resinifera latex on the corrosion behavior of stainless steel (SS) in sulfuric acid. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization were used to evaluate the inhibitory effect of TF on the corrosion behavior of SS. In essence, the molecular structure of the inhibitor is highly considered to describe the interaction with the metal surface. The effec
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