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A study on anticorrosive property of phenolic components from Pachysandra terminalis against low carbon steel corrosion in acidic medium

Subramanian Chitra (Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore, Tamil Nadu, India)
Ill-Min Chung (Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul, South Korea)
Seung-Hyun Kim (Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul, South Korea)
Mayakrishnan Prabakaran (Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul, South Korea)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 28 June 2019

Issue publication date: 21 August 2019

Abstract

Purpose

The study aims to find new anticorrosive components from a plant source, namely, Pachysandra terminalis Sieb. et Zucc. (P. terminalis), a traditional medicinal shrub predominantly used by Tujia people.

Design/methodology/approach

Because phenolic components from plants are known for its numerous values in several fields, the corrosion inhibitive ability of P. terminalis extract was analyzed by electrochemical studies (polarization, electrochemical impedance spectroscopy) and surface examination (by scanning electron microscopy [SEM], energy-dispersive X-ray spectroscopy [EDX] and atomic force microscopy [AFM]).

Findings

The examination of total phenolic content (TPC), total flavonoids content (TFC) and individual phenols (UHPLC) showed the presence of 85.21 mg/g (TPC), 25.38 mg/g (TFC), protocatechuic acid (62.10 µg/g), gentisic acid (60.21µg/g), rutin (50.12 µg/g), kaempferol (46.58 µg/g) and p-Coumaric acid (42.35µg/g) . The polarization study shows that the maximum shift is (16 mV), imposing a mixed mode of inhibition, dominantly anodic. The surface morphology studies by SEM, EDX and AFM confirmed the adsorption of phytochemical components on the low carbon steel surface blocking the active sites.

Originality/value

The study unveils the inhibitive nature of P. terminalis, preventing aggressive attack by 0.5 M HCl on low carbon steel. This also exhibits few phenols present in methanolic leaf extract which may be the role player of corrosion inhibition.

Keywords

Acknowledgements

This paper was supported by the KU Research Professor Program of Konkuk University.

Subramanian Chitra and Ill-Min Chung contributed equally to this work.

Citation

Chitra, S., Chung, I.-M., Kim, S.-H. and Prabakaran, M. (2019), "A study on anticorrosive property of phenolic components from Pachysandra terminalis against low carbon steel corrosion in acidic medium", Pigment & Resin Technology, Vol. 48 No. 5, pp. 389-396. https://doi.org/10.1108/PRT-09-2018-0095

Publisher

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Emerald Publishing Limited

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