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Abstract

Melia Azedarach (TAE) extract was investigated as eco-friendly corrosion inhibitors of mild steel in 1.0 M HCl using potentiodynamic polarization, linear polarization resistance, electrochemical impedance spectroscopy (EIS), scanning electron microscopy and atomic force microscopy techniques. The experimental results show that TAE is good corrosion inhibitor and the inhibition efficiency is increased with TAE extract concentrations. The results of AC impedance have shown that polarization resistance increased and constant phase element decreased with increasing TAE concentrations. Polarization curves indicated that TAE is mixed inhibitor. Scanning electron and atomic force microscopy studies confirmed the formation of a protective film on the mild steel surface. The inhibitor adsorbed on the iron surface was found to be in a good agreement with the Langmuir adsorption isotherm and the value of adsorption free energy of (G°ads) was also calculated

Keywords

• Acid corrosion inhibitor; electrochemical impedance spectroscopy; scanning electron microscopy; atomic force microscopy

Asidik Ortamda Yumuşak Çeliğin Korozyonu Üzerine Melia Azedarach Özütünün İnhibitör Davranışı

Abstract

1,0 M HCl çözeltisi içerisinde yumuşak çeliğin korozyon davranışı üzerine etkisi çevreyle dost Melia Azedarach (TAE) özütü, potansiyodinamik polarizasyon, lineer polarizasyon direnci, elektrokimyasal impedans spektroskopisi (EIS), taramalı elektron ve atomik güç mikroskobisi yöntemleri kullanılarak araştırılmıştır. Deneysel sonuçlar, TAE özütünün iyi bir korozyon inhibitörü olduğunu ve inhibisyon etkinliğinin TAE derişiminin artmasıyla arttığınını göstermektedir. EIS sonuçlarına göre, TAE derişiminin artmasıyla polarizasyon direnci değerleri artmakta sabit faz elementi değeri azalmaktadır.  Polarizasyon eğrileri, TAE’nın karma tip inhibitör olduğunu göstermektedir. Taramalı elektron ve atomik güç mikroskopi çalışmaları yumuşak çelik yüzeyinde koruyucu filmin oluştuğunu doğrulamaktadır. Metal yüzeyine adsorplanan inhibitör Langmuir adsopsiyon izotermine uymuş ve adsorpsiyon standart serbest entalpi (DG°_ads) değerleri de hesaplanmıştır. 

Anahtar kelimeler: Asit korozyon inhibitörü; elektrokimyasal impedans spektroskopisi; tesbih ağcı özütü; taramalı elektron mikroskobu; atomik kuvvet mikroskobu

Keywords

• Asit korozyon inhibitörü; elektrokimyasal impedans spektroskopisi; tesbih ağcı özütü; taramalı elektron mikroskobu; atomik kuvvet mikroskobu

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