Aster koraiensis as nontoxic corrosion inhibitor for mild steel in sulfuric acid

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 52; pp. 235 - 242
• Main Authors: Prabakaran, Mayakrishnan, Kim, Seung-Hyun, Mugila, Nithiyanandham, Hemapriya, Venkatesan, Parameswari, Kandasamy, Chitra, Subramanian, Chung, Ill-Min
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.08.2017; 한국공업화학회
• Subjects: Aster koraiensis; Corrosion; Electrochemical examination; Mild steel; SEM-EDX; 화학공학; SEM-EDX; Aster koraiensis; Mild steel; Corrosion; Electrochemical examination
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2017.03.052

[Display omitted] •Aster koraiensis extract is a very eco-friendly corrosion inhibitor for mild steel.•Adsorption of inhibitor by mild steel in 1M H2SO4 obeys Langmuir isotherm model.•SEM and EDX examination confirm adsorption of inhibitor unto metal surface. Inhibition efficiency of Aster koraiensis leaf extract toward corrosion of mild steel in 1M H2SO4 solution was investigated using weight loss, electrochemical, FT-IR, SEM, and EDX methods The individual phenolic compounds present in A. koraiensis extract were identified. Maximum efficiency of 90.53% was achieved at 2000ppm of the extract. The corrosion kinetic parameters determined from the polarization curves indicated that the extract acted as a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. SEM investigations confirmed the formation of inhibition layer unto the metal surface by compounds present in the extract.