CORROSION INHIBITION OF BENZOTRIAZOLE AND N-MESYL BENZOTRIAZOLE ON LOW CARBON STEEL IN SULFURIC ACID

Year 2011, Volume: 12 Issue: 1, 1 - 10, 17.06.2011

Evrim Hür , Andaç Arslan Handan Sakarya Deniz Hür

Abstract

This study examines the use of benzotriazole (Bt) and N-mesyl benzotriazole (BtSO₂CH₃) for improvement of corrosion resistance of low carbon steel in 0,1 M sulfuric acid (H₂SO₄). The inhibitor effect of Bt and BtSO₂CH₃ on the corrosion behavior of LCS was studied using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves and polarization resistance techniques. Under the present experimental condition these compounds revealed a good corrosion inhibition. The inhibition efficiency of BtSO₂CH₃ is more than inhibition efficiency of Bt. The potentiodynamic polarization curves indicate that compounds are mixed type inhibitors. The inhibiting properties of compounds were found to depend on the concentration. The adsorption mechanism of compounds was investigated using different adsorption isotherm. At the same time from the adsorption isotherms values of equilibrium constant and values of free energies of adsorption were calculated.

Keywords

benzotriazole, corrosion, inhibitor, carbon steel

Uygulamalı Bilimler ve Mühendislik

Abstract

Bu çalışma 0,1 M sülfürik asit içinde düşük karbon çeliğinin (LCS) korozyon direncini arttırmak için benzotriazol (Bt) ve yeni sentezlenen N-mesil benzotriazol (BtSO2CH3) kullanımını incelemektedir. LCS’nin korozyon davranışına karşı Bt ve BtSO2CH3’ün inhibitör etkisi, elektrokimyasal empedans spektroskopisi (EIS), potansiyodinamik polarizasyon eğrileri ve polarizasyon direnci teknikleri kullanılarak çalışılmıştır. Belirtilen deneysel koşullarda bu bileşikler iyi bir korozyon inhibisyonu göstermektedir. BtSO2CH3’ün inhibitör etkinliği, Bt’ün inhibitör etkinliğinden daha fazladır. Potansiyodinamik polarizasyon eğrileri bileşiklerin karma inhibitör olduğunu göstermektedir. Bileşiklerin inhibisyon özelliklerinin derişime bağlı olduğu bulunmuştur. Bileşiklerin adsorpsiyon mekanizmaları farklı adsorpsiyon izotermleri kullanılarak incelenmiştir. Aynı zamanda serbest enerji ve denge sabiti değerleri adsorpsiyon izotermlerinden hesaplanmıştır

Keywords

Benzotriazol, Korozyon, İnhibitör, Karbon çeliği

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