Anodik Polarizasyon ve Kayma Aşınmasının Gemi İnşa Alüminyum Alaşımı 5083'ün Çukurcuk Korozyonu Davranışına Etkisi

Öz

Bu çalışma, simüle edilmiş deniz suyunda kayma aşınması ve farklı anodik polarizasyon koşulları altında gemi yapımında kullanılan alüminyum alaşımı 5083'ün çukurcuk korozyonu ve eş zamanlı aşınma-korozyon (tribokorozyon) mekanizmalarını karakterize etmeyi amaçladı. Çalışma için %3.5 NaCl çözeltisinde 3 N yük ve farklı anodik potansiyeller altında bir tribokorozyon deney düzeneği sağlanmıştır. Çalışmada, test malzemesinin sertliğinin düşük olması nedeniyle aşınma izi yüzeyinde çok sayıda oluk, paralel çizik ve enine çatlak tespit edilmiştir. AA 5083'ün korozyon ve tribokorozyon davranışında klorür iyonları belirleyici bir rol oynadı. AA5083'ün bozunması açık devre potansiyelinden daha yüksek anodik potansiyellere gittikçe arttı. Yüksek anodik potansiyeller altında, saf alüminyumun çukurcuk korozyonuna benzer bir yarım küp mekanizması ve taneler arası çukurcuk korozyon mekanizması gözlendi.

Anahtar Kelimeler

• Alüminyum Alaşım
• Gemi İnşa
• Korozif aşınma
• Çukurcuk Korozyonu

Effect of Anodic Polarization and Sliding Wear on Pitting Corrosion Behavior of Shipbuilding Aluminum Alloy 5083

Öz

This study aimed to characterize the pitting corrosion and simultaneous wear-corrosion (tribocorrosion) mechanisms of shipbuilding aluminum alloy 5083 under sliding wear and different anodic polarization conditions in simulated seawater. A tribocorrosion experimental setup was provided for the study under a 3 N load and different anodic potentials in a 3.5% NaCl solution. In the study, many grooves, parallel scratches and transverse cracks were determined on the wear track surface due to the low hardness of the test material. Chloride ions played a decisive role in the corrosion and tribocorrosion behavior of AA 5083. The dissolution of AA5083 increased from open circuit potential to higher anodic potentials. A half-cube mechanism, similar to the pitting corrosion of pure aluminum, and an intergranular pitting corrosion mechanism were observed under high anodic potentials.

Anahtar Kelimeler

• Aluminum Alloy
• Shipbuilding
• Corrosive Wear
• Pitting Corrosion
• Tribocorrosion

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