Investigation of the Inhibitory Effect of Extracts and Dietary Fibers Obtained from Hazelnut Leaf and Husk Waste on Mild Steel Corrosion in 1 M HCl

Öz

This study aimed to transform hazelnut leaves and husks, which have significant agricultural waste potential in Turkey, into high value-added corrosion inhibitors. The effects of extracts obtained from hazelnut leaves and husks, and dietary fibers isolated from these wastes, on the corrosion behavior of mild steel in 1 M HCl solution were investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (Tafel), and adsorption isotherms. The findings showed that all inhibitor types reduced the corrosion rate in the acidic medium and the inhibition efficiency increased with increasing concentration. The highest protection efficiency (81.0%) was obtained with hazelnut leaf fiber (200 mg/L) in the studied concentration range. Tafel polarization results revealed that the inhibitors exhibited a mixed-type behavior, controlling both anodic and cathodic reactions. Adsorption studies proved that the inhibitor molecules adhered to the metal surface in accordance with the Langmuir adsorption isotherm, and the adsorption mechanism was a mixed-type process involving both physical and chemical interactions. This study demonstrates that hazelnut agricultural wastes can be evaluated as an eco-friendly, economical, and sustainable source of corrosion inhibitors.

Anahtar Kelimeler

• Corrosion
• Hazelnut
• Green inhibitor
• Mild steel
• Dietary fiber
• Acidic media

Fındık Yaprağı ve Zurufu Atıklarından Elde Edilen Ekstrakt ve Diyet Liflerin 1 M HCl İçinde Yumuşak Çelik Korozyonuna Karşı İnhibitör Etkilerinin İncelenmesi

Öz

Bu çalışmada, Türkiye’de önemli bir tarımsal atık potansiyeline sahip olan fındık yaprağı ve zurufunun katma değeri yüksek korozyon inhibitörlerine dönüştürülmesi hedeflenmiştir. Fındık yaprağı ve zurufundan elde edilen ekstraktlar ile bu atıklardan izole edilen diyet liflerinin, 1 M HCl çözeltisi içerisinde yumuşak çeliğin korozyonunu önleme etkisi; elektrokimyasal empedans spektroskopisi (EIS), potansiyodinamik polarizasyon (Tafel) ve adsorpsiyon izotermi yöntemleri kullanılarak incelenmiştir. Elde edilen bulgular, tüm inhibitör türlerinin asidik ortamda korozyon hızını azalttığını ve derişim artışıyla birlikte inhibisyon verimliliğini arttığını göstermiştir. Çalışılan konsantrasyon aralığında en yüksek koruma verimliliği (%81,0) fındık yaprağı lifi (200 mg/L) ile elde edilmiştir. Tafel polarizasyon sonuçları, inhibitörlerin hem anodik hem de katodik reaksiyonları kontrol eden karma tip bir davranış sergilediğini ortaya koymuştur. Adsorpsiyon çalışmaları, inhibitör moleküllerinin metal yüzeyine Langmuir adsorpsiyon izotermine uygun olarak tutunduğunu ve adsorpsiyon mekanizmasının fiziksel ve kimyasal etkileşimlerin bir arada olduğu karışık tip mekanizma olduğunu kanıtlamıştır. Bu çalışma, fındık tarımsal atıklarının çevre dostu, ekonomik ve sürdürülebilir bir korozyon inhibitör kaynağı olarak değerlendirilebileceğini göstermektedir.

Anahtar Kelimeler

• Korozyon
• Fındık
• Yeşil inhibitör
• Yumuşak çelik
• Diyet lifi
• Asidik ortam

Kaynakça

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