Plant Extracts as Corrosion Inhibitors for Mild Steel in HCl Media – Review I

• S. Bilgiç

Ankara University, Faculty of Science, Department of Chemistry, 06100, Ankara, Turkey

Abstract: Due to fact that most of the chemical compounds, are called inhibitors, that prevent the corrosion of metals and alloys are toxic and harmful for human health and environment. Therefore, scientists have focused on a new class of inhibitors such as plant extracts, fruit and vegetable extracts, essential oils in recent years. In addition to being environmentally friendly in preventing corrosion, plant extracts are getting more and more important because they are cheap, less toxic and easy to obtain. Therefore, the usage of plant extracts as corrosion inhibitors is the subject of many researches in recent years. Plant extracts contain many organic compounds, having polar atoms such as O, P, S and N. These are adsorbed on the metal surface by these polar atoms, and protective films are formed, and various adsorption isotherms are obeyed. Mild steel has been the mostly widely used alloy due to the importance of industrial applications such as mining, cleaning of boilers, oil well tubes and metal processing equipment. Some acids such as hydrochloric acid and sulphuric acid are used for pickling mild steel and industrial cleaning and acid descaling. Therefore, the corrosion of mild steel in these acids is objectionable. In this review as the recent studies regarding as plant extracts as eco-friendly corrosion inhibitors for mild steel in hydrochloric acid media have been summarized.

Keywords: corrosion, hydrochloric acid, mild steel, inhibitors, plant extracts

Int. J. Corros. Scale Inhib., 2021, 10, no. 1, 145-175 PDF (590 K)
doi: 10.17675/2305-6894-2021-10-1-9

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