Düşük karbon çeliğinin asidik ortamdaki korozyonuna karşı inhibitör özelliği gösteren 4-okso-kinazolin türevi katyonik yüzey aktif maddelerin sentezi

Birçok ülkede olduğu gibi bizim ülkemizde de metal korozyonunu önlemeye yönelik kullanılan yöntemlerden biri uygun inhibitör kullanımıdır. Bu amaç doğrultusunda bu çalışmada, 4-okso-kinazolin türevi olan uzun karbon zinciri içeren 3 adet katyonik piridinyum yüzey aktif madde sentezlenmiş ve 1.0 M HCl asit çözeltisi ortamında metal korozyonuna karşı inhibisyon etkinlikleri incelenmiştir. Sentezlenen bileşiklerin yapıları spektroskopik yöntemlerle aydınlatıldıktan sonra yapılan asidik ortamdaki korozyon testleri, oda sıcaklığında 24 saat süreyle ve metal kuponlarındaki kütle kaybına dayalı gravimetrik metotla gerçekleştirilmiştir. Düşük karbon çeliği kullanılarak yapılan korozyon testleri sonucunda, inhibitörlerin değişik konsantrasyonlarında oldukça iyi inhibisyon etkinlikleri (%91.33 - %97.24) elde edilmiştir. İnhibisyon etkinliklerinin dışında yine kütle kaybı değerlerinden yararlanarak inhibitörsüz ve inhibitörlü ortamlardaki korozyon hızları hesaplanmıştır. Son olarak, kütle kaybı yöntemiyle deneysel olarak elde edilen inhibisyon etkinliklerini desteklemek amacıyla taramalı elektron mikroskobu ile metal yüzeylerinin görüntüleri çekilmiştir.

Synthesis of 4-oxo-quinazoline derivative cationic surfactants showing inhibitor properties against the corrosion of low carbon steel in acidic medium

In our country, as in many countries, one of the useful methods to prevent the metallic corrosion is the use of appropiate inhibitor. For this purpose, in this study, three cationic pyridinium surfactants that contain long carbon chain and being with 4-oxo-quinazoline derivative group were synthesized and their corrosion inhibition efficiencies against metallic corrosion in acidic medium were investigated. After the characterization of the syntesized compounds via spectroscopic methods, the corrosion test in acidic medium were done at room temperature for 24 h by the gravimetric method based on the weight loss of metal coupons. After result of the corrosion tests which were done using a low carbon steel, fairly good inhibition efficiencies (91.33 % - 97.24 %) were obtained at different inhibitor concentrations. Outside the inhibition efficiencies, the corrosion rate values of the inhibited and uninhibited coupons were also measured. Finally, the images of the metal surfaces were taken using scanning electron microscopy to support the corrosion inhibition efficiency results obtained by the weight loss method.

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