Kaplama Öncesi Farklı Yüzey İşlemlerinin Grafen Oksit Kaplanmış Alüminyum Alaşımının Korozyon Davranışına Etkileri

Abstract

Bu çalışmada, grafen oksit kaplama öncesi AA5754 alüminyum alaşımı yüzeyine uygulanan dört farklı yüzey işleminin korozyon davranışına etkileri araştırılmıştır. Kaplama işlemi öncesinde dört farklı numune grubuna 180, 320, 800 ve 1200 tane numaralı SiC esaslı zımparalar ile yüzey hazırlama işlemi yapılmıştır. Alüminyum alaşımı numuneler, 5 V potansiyel ve 5 dakika süre uygulanarak elektroforetik biriktirme prosesi ile grafen oksit kaplama yapılmıştır. Kaplama yapılan dört farklı grup numunelere tuzlu su çözeltisinde elektrokimyasal korozyon testleri uygulanmıştır. Elektrokimyasal korozyon testlerinde potansiyodinamik yöntem kullanılarak polarizasyon ve Tafel polarizasyon eğrileri elde edilmiştir. Korozyon deneyleri sonuçlarına göre, grafen oksit kaplama öncesi alüminyum alaşımı yüzeyine yapılan zımparalama işleminde, zımpara tane numarası arttıkça yani zımpara tane boyutu azaldıkça, korozyon hızının azaldığı, korozyon direncinin arttığı belirlenmiştir.

Keywords

• Yüzey işlemi
• Grafen oksit kaplama
• Korozyon
• Alüminyum

The Effects of Different Surface Treatments before Coating on Corrosion Properties of Aluminum Alloy Coated with Graphene Oxide

Abstract

In this study, the effects of four different surface treatments applied on the AA5754 aluminum alloy surface before graphene oxide coating on the corrosion behavior were investigated. Before the coating process, surface preparation was performed with SiC based grindingpapers with 180, 320, 800 and 1200 grit numbers on four different sample groups. Graphene oxide coating was made by electrophoretic deposition process by applying 5 V potential and 5 minutes to aluminum alloy samples. Electrochemical corrosion tests in salt water solution were applied to four different groups of samples that were coated. Polarization and Tafel polarization curves were obtained by using the potentiodynamic method in electrochemical corrosion tests. According to the results of the corrosion experiments, it was determined that the corrosion rate decreased and the corrosion resistance increased as the grindingpaper grain number increased, that is, as the grindingpaper grain size decreased, in the grinding process on the aluminum alloy surface before graphene oxide coating.

Keywords

• Surface treatment
• Graphene oxide coating
• Corrosion
• Aluminum

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