Çeliğin sülfürik asit ortamındaki korozyonunda benzoik asit ve salisilik asidin inhibitör etkisinin karşılaştırılması

Bu çalışmada bileşimi belli çeliğin sülfürik asit ortamındaki korozyonuna benzoik asit ve salisilik asidin inhibitor etkisi incelenmiştir. Her iki organik asitle 2,5 $mVs^{-2}$'lik potansiyel tarama hızında $1.10^{-3}$, $5.10^{-3}$, $1,5. 10^{-2}$ ve $2,0.10^{-2}$ M'lık derişimlerde ve üç ayrı sıcaklıkta (313, 328 ve 343 K) çalışılarak korozyon parametreleri belirlenmiştir. Çalışılan bütün sıcaklıklarda asit derişimlerinin artmasıyla korozyon hızlarının azaldığı, % inhibisyon etkinlikleri ve yüzey kaplanma kesirlerinin arttığı bulunmuştur. Ancak benzoik asit aynı derişimdeki salisilik asitten daha iyi bir inhibitor olarak davranmaktadır. Her iki organik asidin de çelik yüzeyinde Langmuir izotermine göre adsorplandığı belirlenmiştir.

The inhibition effects of benzoic acid and salicylic acid on the corrosion of steel in sulphuric acid medium

In this study, the inhibitor effect of benzoic acid and salicylic acid in sulphuric acid medium on the steel with known composition has been investigated. In both organic acids corrosion parameters were determined with a potential scan rate of 2.5 $mVs^{-2}$ at $1.10^{-3}$, $5.10^{-3}$, $1,5. 10^{-2}$ and $2,0.10^{-2}$ M concentrations and three different temperatures, namely N313, 328 and 343 K. For all temperatures worked at, it has been determined that corrosion rates decrease and that % inhibition efficiencies and surface coverage degrees increase with an increase in acid concentration. However, benzoic acid acts as a better inhibitor compared to salicylic acid with equal concentration. It has been determined that for both organic acids the adsorption on the steel is in accordance with the Langmuir isotherm.

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