Exploring the role of grain refinement and graphene coatings in the corrosion resistance of AZ91 magnesium alloy

• Autorzy: Kadhim Noor S. , Hussein Adi M. Abdul , Al-Zubaydi Ahmed S. J.

Identyfikatory

DOI

10.15199/40.2025.6.2

Warianty tytułu

PL

Analiza wpływu zmniejszenia wielkości ziarna i zastosowania powłok grafenowych na odporność stopu magnezu AZ91 na korozję

• Języki publikacji: EN

Abstrakty

EN

The synergistic effects of grain refinement and graphene coating on the corrosion resistance of the AZ91 magnesium alloy were presented. The corrosion behavior of specimens with varying grain sizes (1 µm, 10 µm, 30 µm, and 100 nm) was evaluated before and after the application of the graphene coating. The results showed that grain refinement significantly improved corrosion resistance, with the nanostructured specimen (100 nm) exhibiting the lowest corrosion current density (Icorr) and the most positive corrosion potential (Ecorr), owing to a more uniform passive oxide layer and reduced galvanic coupling between the α-Mg matrix and β-Mg17Al12 phases. Furthermore, the graphene coating enhanced corrosion resistance by acting as an impermeable barrier against chloride ions, with the finestgrained specimen demonstrating strong adhesion and durability of the coating. Additionally, a 70% decrease in Icorr was achieved for the nanostructured specimen after graphene coating, highlighting the combined benefits of microstructural refinement and graphene reinforcement. SEM observations confirmed that coarse-grained specimens experienced localized corrosion, while nanostructured specimens showed minimal defects and superior performance. These results underscore the critical role of grain refinement in optimizing the effectiveness of graphene coatings for improved corrosion resistance in Mg alloys.

PL

Zbadano synergiczny wpływ rozdrobnienia ziarna i zastosowania powłoki grafenowej na odporność na korozję stopu magnezu AZ91. Oceniono zachowanie próbek o różnych rozmiarach ziarna (1 µm, 10 µm, 30 µm i 100 nm) przed i po naniesieniu powłoki grafenowej. Wyniki wykazały, że rozdrobnienie ziarna znacznie poprawiło odporność na korozję, przy czym próbka o strukturze nanometrycznej (100 nm) wykazała najniższą gęstość prądu korozyjnego (Icorr) i najbardziej dodatni potencjał korozyjny (Ecorr) dzięki bardziej jednolitej warstwie pasywnej tlenku i zmniejszonemu sprzężeniu galwanicznemu między matrycą α-Mg a fazami β-Mg17Al12. Ponadto powłoka grafenowa poprawiła odporność materiału na korozję, działając jako nieprzepuszczalna bariera dla jonów chlorkowych, a próbka o najdrobniejszym ziarnie wykazała silną przyczepność i trwałość powłoki. Dodatkowo po naniesieniu powłoki grafenowej uzyskano 70% spadek Icorr dla próbki nanostrukturalnej, co wskazuje na połączone korzyści wynikające z poprawy mikrostruktury i wzmocnienia materiału grafenem. Obserwacje SEM potwierdziły, że próbki o gruboziarnistej strukturze uległy korozji miejscowej, podczas gdy próbki z nanostrukturą wykazały minimalne wady i wysokie parametry użytkowe. Wyniki te podkreślają kluczową rolę rozdrobnienia ziarna w optymalizacji skuteczności powłok grafenowych pod kątem poprawy odporności stopów magnezu na korozję.

Słowa kluczowe

EN

AZ91 magnesium alloy; laser evaporation deposition (PVD); corrosion; SEM observation

PL

stop magnezu AZ91; metoda fizycznego osadzania z fazy gazowej (PVD); korozja, obserwacje SEM

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Ochrona przed Korozją
• Rocznik: 2025
• Tom: nr 6
• Strony: 167--174
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr.

Twórcy

autor

Kadhim Noor S.

• Department of Applied Sciences, University of Technology-Iraq, Baghdad, Iraq

• https://orcid.org/0009-0001-7958-0321

autor

Hussein Adi M. Abdul

• Department of Applied Sciences, University of Technology-Iraq, Baghdad, Iraq

• https://orcid.org/0000-0002-3089-6368

autor

Al-Zubaydi Ahmed S. J.

• Department of Applied Sciences, University of Technology-Iraq, Baghdad, Iraq

• https://orcid.org/0000-0001-5037-5714

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