Serkan ÖZTÜRK, Emine TELCİ, Gamze BEKTAŞ, Büşra KAYA, Ebru TANER, Kübra KIVRAK

İki Pozitif Azot Atomu İçeren Di-katyonik Yüzey Aktif Maddelerin Sentezi ve 1.0 M HCl Ortamında Korozyon İnhibisyon Etkinliklerinin İncelenmesi

Bu çalışmada, kimyasal yapısında iki adet pozitif yüklü kuaterner amonyum azotu içeren üç tane di-katyonik yüzey aktif madde sentezlenmiştir. Sentezlenen yüzey aktif maddelerin kimyasal yapıları çeşitli spektroskopik yöntemlerle (FT-IR, 1H NMR ve 13C NMR) ispatlanmıştır. Sentezlenen ve moleküler yapıları aydınlatılan 3 adet ürünün, 1.0 M HCl asidik ortamda, kütle kaybı yöntemi kullanılarak yumuşak çeliğin korozyonuna karşı inhibisyon etkinlikleri belirlenmiştir. Farklı inhibitör konsantrasyonlarına sahip asidik çözeltilere, metal kuponların, oda sıcaklığında 24 saat süreyle daldırılması suretiyle yapılan korozyon testleri sonucunda, her üç yüzey aktif madde için, birbirine yakın ve etkin inhibisyon verimleri elde edilmiştir. Moleküler yapılarında bulunan uzun karbon zincirindeki karbon sayısının fazlalığı korozyona karşı korumada etkin bir faktör olduğu gösterilmiştir. Uzun zincirindeki karbon sayısı en fazla olan inhibitörün asit ortamındaki korozyon inhibisyon etkinliğinin diğerlerine göre biraz daha yüksek olduğu tespit edilmiştir. Bunun yanı sıra, korozyona karşı etkinlikleri ile ilişkilendirmek adına, söz konusu di-katyonik yüzey aktif maddeler için kritik misel konsantrasyonu, bu konsantrasyondaki yüzey gerilimleri, misel oluşum serbest enerjisi, köpük kararlılığı gibi bazı fizikokimyasal parametreleri de hesaplama yoluna gidilmiştir. Yüzey aktif maddelerin metal yüzeyine adsorbe olarak yüzeyi korozyondan koruduklarının önemli bir destekleyici delili olan taramalı elektron mikroskobu (SEM) ile yüzey görüntüleri de alınmış ve asit çözeltisine daldırılan metal yüzeylerindeki pürüzlülük halleri belirlenmiştir.

Anahtar Kelimeler:

Sentez, Di-katyonik yüzey aktif madde, Korozyon inhibitörü, Kütle kaybı, SEM

Synthesis of Di-cationic Surfactants Containing Two Positive Nitrogen Atoms and Investigation Their Corrosion Inhibition Efficiency in 1.0 M HCl Medium

Three di-cationic surfactants containing two positively charged quaternary ammonium nitrogen in their chemical structure were synthesized in this study. The chemical structures of the synthesized surfactants were characterized by various spectroscopic methods (FT-IR, 1H NMR and 13C NMR). The inhibition activities of the three synthesized products, against corrosion of mild steel, were determined by using the weight loss method in 1.0 M HCl acidic medium. Close and effective inhibition efficiencies were obtained for all three surfactants as a result of corrosion tests which were performed by immersing metal coupons in acidic solutions with different inhibitor concentrations for 24 hours at room temperature. It has been shown that the number of carbon in the long carbon chain in their molecular structures, was been an effective factor in corrosion protection. The inhibitor with the highest number of carbon in the long chain, has a slightly higher corrosion inhibition efficiency in the acid environment than the others. In addition, some physicochemical parameters such as critical micelle concentration, surface tensions at this concentration, micelle formation free energy, foam stability were calculated for the di- cationic surfactants to correlate them with their anti-corrosion activities. Surface images were also taken with scanning electron microscope (SEM), which indicate that surfactants adsorb on the metal surface and protect the surface from corrosion. With this method, the roughness of the metal surfaces immersed in the acid solution were determined.

Keywords:

Synthesis, Di-cationic surfactant, Corrosion inhibitor, Weight loss, SEM,

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