Mekanik alaşımlama yöntemi ile üretilen Al matrisli hibrit kompozit malzemenin farklı çözeltilerdeki korozyon davranışları

Abstract

Bu çalışmada, Mekanik Alaşımlama (MA) yöntemiyle üretilen alüminyum matrisli hibrit (in-situ Al4C3 ve ex-situ Al2O3) kompozit malzemenin farklı çözeltilerdeki korozyon davranışları incelenmiştir. Alüminyum matrise %2 grafit ve %12 Al2O3 ilave edilerek hazırlanan tozlar mekanik alaşımlanmıştır. Mekanik alaşımlanan hibrit kompozit tozlar 750 MPa altında soğuk preslenmiş ve 600 °C sıcaklıkta 120 dk sinterlenmiştir. Üretilen AMK malzemelerin korozyon testleri %3,5 NaCl ve 0,1 M H2SO4 çözeltilerinde elektrokimyasal empedans spektroskopi (EIS) ve potansiyodinamik polarizasyon teknikleri kullanılarak yapılmıştır. Polarizasyon ölçümleri üç elektrot kurulumlu bir korozyon hücresinde (Ag/AgCl referans elektrotu, bir platin plaka ve karşıt elektrot) yapılmıştır. Mikroyapı çalışmalarında matrise ilave edilen Al2O3 takviyesinin tane sınırlarında kümelenme eğiliminde olduğu görülmüştür. Ayrıca matrise ilave edilen grafit’in yapıda tamamen çözünmediği iri grafit parçacıkları şekilde kaldığı görülmüştür. XRD sonuçlarında yapıda oluşması beklenen Al4C3 fazının oluştuğu belirlenmiştir. Korozyon sonuçlarda hibrit kompozit malzemenin NaCl çözeltisi içerisinde daha düşük potansiyel ve daha düşük akım yoğunluğu elde edilmiştir. Empedans ölçümleri sonucunda H2SO4 çözeltisinde daha küçük bir yarım daire çapına sahip Nyquist eğrisi elde edilmiştir. Sonuçlarda NaCl çözeltisi içerisinde korozyon direncinin H2SO4 çözeltisinden daha iyi olduğu belirlenmiştir. Korozyon yüzeyi incelemelerinde baskın korozyon mekanizmasının çukurcuk korozyonu olduğu görülmüştür.

Keywords

• Hibrit kompozit
• potansiyodinamik polarizasyon
• empedans
• korozyon.

Corrosion behaviors in different solutions of hybrid composite produced by mechanical alloying method

Abstract

In this study, was investigated corrosion behavior in different solutions of aluminum matrix hybrid (in-situ Al4C3 and ex-situ Al2O3) composite material produced by Mechanical Alloying (MA) method. The powders prepared by adding 2% graphite and 12% Al2O3 to the aluminum matrix were mechanical alloyed. Mechanically alloyed hybrid composite powders were cold pressed under 750 MPa and sintered at 600 °C for 120 min. Corrosion tests of the produced AMK materials were carried out in 3.5% NaCl and 0.1 M H2SO4 solutions using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Polarization measurements were made in a corrosion cell with a three-electrode setup (Ag/AgCl reference electrode, a platinum plate, and counter electrode). In the microstructure studies, it was observed that the Al2O3 reinforcement added to the matrix tended to cluster at the grain boundaries. In addition, it was observed that the graphite added to the matrix remained in the form of coarse graphite particles that did not completely dissolve in the structure. In the XRD results, it was observed that the Al4C3 phase expected to form in the structure was formed. In the results obtained, it was observed that the hibrit composite material had lower potential and lower current density in the NaCl solution. As a result of impedance measurements, a Nyquist curve with a smaller semicircle diameter was obtained in H2SO4 solution. The results showed that corrosion resistance in NaCl solution was better than in H2SO4 solution. Pitting corrosion was found to be the dominant corrosion mechanism in the corrosion surface examinations.

Keywords

• Hybrid composite
• potentiodynamic polarization
• impedance
• corrosion.

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