Investigation of Corrosion Behavior of Cu-based Metal Matrix Composite Coatings in Pseudomonas Aeruginosa and Aspergillus Niger Environments

Year 2024, Volume: 26 Issue: 78, 398 - 414, 27.09.2024

Buğra Karahan , Uğur Malayoğlu , Kadir Cihan Tekin , Aslı Şahiner

https://doi.org/10.21205/deufmd.2024267806

Abstract

In this study, Cu-based metal matrix composite (MMC) coatings of different thicknesses were produced on 7075 aluminum alloy (AA) by low pressure cold gas dynamic spray (CGDS) process, using coating powders in four different compositions: CA (100% Cu-Al2O3), CNZA15 (85% Cu-Al2O3+15% Ni-Zn-Al2O3), CNZA30 (70% Cu-Al2O3+30% Ni-Zn-Al2O3) and CZA (100% Cu-Zn-Al2O3). The study aimed to investigate the effects of coating composition and thickness on the microbiological corrosion behavior of coatings. X-ray diffraction (XRD) patterns show that the phase contents of the coating powder and the coating produced with the same powder are similar to each other. It was also concluded that the powders were not exposed to high temperatures (T>~300°C) during the coating process and the thermal effect did not cause any phase transformation, and this was confirmed using a scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectrometer (EDS). Optical microscope (OM) and SEM analyzes determined that the dominant metal matrix in the coating microstructures was copper and Al2O3 particles were homogeneously distributed in the metal matrix. Microbiological corrosion tests were performed using Pseudomonas aeruginosa and Aspergillus niger reference strains. The results obtained at the end of the incubation period demonstrate that CZA coatings show effective antibacterial activity against bacteria and also provide an antifungal effect by preventing fungus formation. Additionally, an inhibition zone was detected in Aspergillus niger medium for CZA coatings and the zone diameter was measured to be 7 mm. These findings indicate that the composition is effective on the microbiological corrosion behavior of coatings and that CZA coatings, in particular, achieve successful results against both bacteria and fungus.

Keywords

7075 AA, CGDS, MMC Coating, Microbiological Corrosion, Pseudomonas Aeruginosa, Aspergillus Niger

Cu Esaslı Metal Matris Kompozit Kaplamaların Pseudomonas Aeruginosa ve Aspergillus Niger Ortamlarındaki Korozyon Davranışlarının İncelenmesi

Abstract

Bu çalışmada CA (%100 Cu-Al2O3), CNZA15 (%85 Cu-Al2O3+%15 Ni-Zn-Al2O3), CNZA30 (%70 Cu-Al2O3+%30 Ni-Zn-Al2O3) ve CZA (%100 Cu-Zn-Al2O3) olmak üzere 4 farklı kompozisyondaki kaplama tozu kullanılarak farklı kalınlıklardaki Cu esaslı metal matris kompozit (MMK) kaplamalar düşük basınç soğuk dinamik gaz püskürtme (SDGP) prosesi ile 7075 alüminyum alaşımı (AA) üzerinde üretilmiş, kompozisyon ve kalınlığın kaplamaların mikrobiyolojik korozyon davranışları üzerindeki etkisi araştırılmıştır. X-ışını difraksiyonu (XRD) paternleri ile kaplama tozları ve bu tozlardan üretilen kaplamaların benzer faz içeriklerine sahip olduğu bulunmuştur. Ayrıca kaplama prosesi esnasında tozların yüksek sıcaklıklara (T>~300°C) maruz kalmadığı ve termal etkinin herhangi bir faz dönüşümüne neden olmadığı sonucu ortaya çıkarılmış ve enerji dağıtıcı X-ışını spektrometresi (EDS) ile donatılmış taramalı elektron mikroskobu (SEM) kullanılarak doğrulanmıştır. Diğer taraftan optik mikroskop (OM) ve SEM analizleri ile kaplama mikroyapılarında baskın metal matrisin bakır olduğu ve Al2O3 partiküllerinin metal matrisine homojen bir şekilde dağıldığı tespit edilmiştir. Mikrobiyolojik korozyon testleri bir Gram-negatif bakteri olan Pseudomonas aeruginosa ve bir küf türü olan Aspergillus niger referans strainleri kullanılarak gerçekleştirilmiştir. İnkübasyon süresi sonunda en etkili antibakteriyel ve antifungal etkiyi CZA kaplamaları göstermiştir. Ayrıca CZA kaplamaları için Aspergillus niger ortamında inhibisyon zonu tespit edilmiş ve zon çapı 7 mm olarak ölçülmüştür. Sonuçlar kaplamaların mikrobiyolojik korozyon davranışları üzerinde kompozisyonun etkili olduğunu ve hem bakteri hem de küf ortamında CZA kaplamalarının başarılı sonuçlar ortaya çıkaracağını göstermiştir.

Keywords

7075 AA, SDGP, MMK Kaplama, Mikrobiyolojik Korozyon, Pseudomonas Aeruginosa, Aspergillus Niger

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