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Authors:
Arlinda Caci, Jolda Zotaj, Alketa Lame, Efrosini Kokalari, and Sadik Cenolli, Albania
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Abstract:
Corrosion control of metals is of technical, economic, environmental, and aesthetical importance. The use of green inhibitors is one of the best options of protecting metals and alloys against corrosion. Green inhibitors are extracted by plant products. As in addition to being environmentally friendly and ecologically acceptable, plant products are inexpensive, readily available and renewable. We have used Black Pepper extract as a green corrosion inhibitor. Historically, pepper has been thought to cure many illnesses such as cancer, malaria, and cholera; however, today it is most commonly used as a food additive. The material under investigation is Iron B 500 usually applied to concrete as reinforcing bars. The inhibition efficiency of Black Pepper extract in respect of Iron B 500 is investigated in sulphuric acid media in presence of chloride ions, in form of NaCl (1.0 mol/L H2SO4 + Cl- 10-3 mol/L). Weight loss measurements and an electrochemical method such as potentiodynamic polarization are used for inhibition efficiency testing. Both methods show that inhibition efficiency increases with the increasing concentration of the inhibitors and corrosion rate decreases with the increasing concentration of the inhibitors. Black Pepper extract for weight loss measurements and electrochemical measurements gave respectively 58% and 84% inhibition efficiencies in concentration 1.0 g/L.
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