Sinan BAYRAM, Mohd Hazwan HUSSİN, Tuan Sherwyn HAMİDON, Mustafa OZDEMİR

Hibrit sol-jel matrisine katkılı yeni bir korozyon inhibitörü olarak bakteriyel eumelanin polimerinin antikorozif performansı

Melaninler, doğada mikroorganizmalardan insanlara kadar çok çeşitli canlı gruplarında yaygın olarak dağılmış bir organik polimer grubudur. Neredeyse tüm canlı gruplarında bulunan bu pigmentler, antioksidan, antimikrobiyal, antivenin, antienflamatuar, radyoprotektif, fotokoruyucu vb. birçok farklı özelliğe sahiptir. Bu çalışmada, Streptomyces parvus BSB49 suşundan saflaştırılan eumelanin polimerinin korozyon önleyici performansının belirlenmesi amaçlanmıştır. Bu amaçla, eumelanini bir doping ajanı olarak dahil etmek için tetraetil ortosilikat ve 3-aminopropiltrietoksisilan kullanılarak hibrit sol-jel matrisi sentezlenmiştir. Bu işlemde Si ≤ %0,16, Mn ≤ %0,15, Mg ≤ %0,03, Al ≤ %0,06, P ≤ %0,01, Na ≤ %0,02 ve Ca ≤ %0,01 bileşimine sahip yumuşak kaplamaları uygulamak için çelik levhalar kullanılmıştır. Substrat kaplanmış numunelerin korozyon davranışını araştırmak için 0,5 M HC1 korozyon ortamı ile yüklenen üç elektrotlu bir hücre düzeni kullanılmıştır. Ömelaninin doping konsantrasyonundaki artışla korozyon hızı azalmıştır. Böylece elektrokimyasal empedans spektroskopisi ve potansiyodinamik polarizasyon ölçümleri ile elde edilen sonuçlar, Streptomyces parvus BSB49 suşu kullanılarak üretilen eumelanin pigmentinin antikorozif özelliklere sahip olduğunu ortaya koymuştur.

Anahtar Kelimeler:

Eumelanin, Biyosentez, Korozyon önleyici, Empedans, Polarizasyon

Anticorrosive performance of bacterial eumelanin polymer as a novel corrosion inhibitor doped into hybrid sol-gel matrix

Öz Melaninler, doğada mikroorganizmalardan insanlara kadar çok çeşitli canlı gruplarında yaygın olarak dağılmış bir organik polimer grubudur. Neredeyse tüm canlı gruplarında bulunan bu pigmentler, antioksidan, antimikrobiyal, antivenin, antienflamatuar, radyoprotektif, fotokoruyucu vb. birçok farklı özelliğe sahiptir. Bu çalışmada, Streptomyces parvus BSB49 suşundan saflaştırılan eumelanin polimerinin korozyon önleyici performansının belirlenmesi amaçlanmıştır. Bu amaçla, eumelanini bir doping ajanı olarak dahil etmek için tetraetil ortosilikat ve 3-aminopropiltrietoksisilan kullanılarak hibrit sol-jel matrisi sentezlenmiştir. Bu işlemde Si ≤ %0,16, Mn ≤ %0,15, Mg ≤ %0,03, Al ≤ %0,06, P ≤ %0,01, Na ≤ %0,02 ve Ca ≤ %0,01 bileşimine sahip yumuşak kaplamaları uygulamak için çelik levhalar kullanılmıştır. Substrat kaplanmış numunelerin korozyon davranışını araştırmak için 0,5 M HC1 korozyon ortamı ile yüklenen üç elektrotlu bir hücre düzeni kullanılmıştır. Ömelaninin doping konsantrasyonundaki artışla korozyon hızı azalmıştır. Böylece elektrokimyasal empedans spektroskopisi ve potansiyodinamik polarizasyon ölçümleri ile elde edilen sonuçlar, Streptomyces parvus BSB49 suşu kullanılarak üretilen eumelanin pigmentinin antikorozif özelliklere sahip olduğunu ortaya koymuştur.

Keywords:

Eumelanin, Biosynthesis, Anticorrosion, Impedance, Polarization,

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