YUMUŞAK ÇELİĞİN KOROZYON İNHİBİTÖRLERİNE KLOROANİLİNDEN SENTEZLENEN YENİ BİR ÖRNEK: 2-[(2,5- DİKLOROFENİLİMİNO)METİL]FENOL

Kloroanilin türevli yeni bir 2-[(2,5-diklorofenilimino)metil]fenol (CPMP) Schiff bazı literatürdeki metotlara göre sentezlenmiş ve bu çalışmada CPMP’nin 1,0 M HCl çözeltisi içerisinde 298 K’de yumuşak çeliğin korozyonuna inhibitör etkisi, elektrokimyasal impedans spektroskopisi (EIS), lineer polarizasyon direnci (LPR) ve potansiyodinamik polarizasyon eğrileri yöntemleri kullanılarak araştırılmıştır. Farklı derişimlerin zaman parametreleriyle değişimini incelemek amacıyla EIS tekniği ile Nyquist eğrileri elde edilmiş ve bu eğrilerin de yarım elips şeklinde oldukları görülmüştür. CPMP’nin adsorpsiyon mekanizması hakkında bilgi edinmek amacıyla EIS tekniğiyle metalin sıfır yük potansiyeli belirlenmiştir. CPMP’nin yumuşak çelik yüzeyine adsorpsiyonunun Langmuir adsorpsiyon izotermine uyduğu görülmüştür. Adsorpsiyon izoterminden yararlanarak termodinamik adsorpsiyon parametreleri hesaplanmıştır. Yumuşak çelik elektrotların yüzey morfolojileri, taramalı elektron mikroskobu (SEM) ve yüzey morfolojisi, yüzey pürüzlülüğü ve yüzey esnekliği hakkında önemli bilgiler veren atomik kuvvet mikroskobu (AFM) ile incelenmiştir. EIS bulguları ile yüzey analiz sonuçları birbirini desteklemektedir.

A NEW EXAMPLE OF MILD STEEL CORROSION INHIBITORS SYNTHESIZED FROM CHLOROANILINE: 2-((2,5- DICHLOROPHENYLIMINO)METHYL)PHENOL

In this study according to literature methods, a new Schiff base derived from chloroaniline namely 2-[(2,5- dichlorophenylimino)methyl]phenol (CPMP) has been synthesized and investigated on mild steel in 1.0 M HCl solution at 298 K by using electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiodynamic polarization techniques. Nyquist curves have been obtained with the EIS and have been found to be semi-elliptical. In order to get information about the adsorption mechanism of CPMP, the potential of zero charge of metal is determined by using EIS. The CPMP’s adsorption to the mild steel surface has been seen to obey Langmuir adsorption isotherm. Thermodynamic adsorption parameters have been calculated using adsorption isotherm. The surface morphology of mild steel electrodes have been examined by using scanning electron microscope (SEM) and atomic force microscope (AFM), giving important information about surface morphology, surface roughness and surface elasticity. EIS and surface analysis results are supported each other.

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