AA6063 ALÜMİNYUM ALAŞIMININ H2SO4 ORTAMINDAKİ KOROZYON DAVRANIŞINA YAŞLANDIRMA SÜRESİNİN ETKİSİ

AA6063 alaşımı hafiflik, mekanik dayanım ve korozyon direnci gibi özellikleri bir arada bulundurması nedeniyle yaygın bir kullanıma sahiptir. Özellikle bu alaşımlara uygulanan çökelme sertleşmesi işlemiyle, mekanik özelliklerde önemli artışlar meydana gelmektedir. Ancak çökelme sertleşmesi işlemi alaşımın korozyon direncini düşürmektedir. Bu çalışmada, AA6063 alaşımı 200˚C’de 2, 4 ve 8 saat yaşlandırılmış ve yaşlandırılan numunelerin farklı oranlarda H2SO4 içeren (%2, %4, %6) ortamlardaki korozyon davranışları araştırılmıştır. Numunelerin korozyon davranışı, ağırlık kayıplarının incelenmesiyle belirlenmiştir. Ayrıca sertlik ölçümleriyle, yaşlandırma işleminin mekanik özellikler üzerindeki etkisi incelenmiştir. Korozyon testleri sonucunda yaşlandırma süresi arttıkça korozyon oranının arttığı, özellikle 8 saat yaşlandırılan numunenin %6 H2SO4 içeren çözeltide yüksek oranda korozyona uğradığı belirlenmiştir.

Anahtar Kelimeler:

AA6063 alüminyum alaşımı, ısıl işlem, korozyon

EFFECT OF AGING TIME ON THE CORROSION PROPERTIES OF AA6063 ALUMINIUM ALLOY IN H2SO4 ENVIRONMENT

AA6063 aluminium alloy has been widely used due to its combined properties as lightness, mechanical strength, and corrosion resistance. Especially, precipitation hardening process enhances the mechanical properties of the aluminium alloys. Also, precipitation hardening process reduces the corrosion resistance of the aluminium alloys. In this study, aging treatments are applied to AA6063 aluminium alloy at 200˚C for 2, 4 and 8 hours and corrosion behaviour of aged samples is investigated in H2SO4 solutions with various H2SO4 ratio (2%, 4%, 6%). Corrosion behavior of the specimens is determined by measuring the weight loss. Moreover, the effect of aging treatment on mechanical properties is investigated with hardness measurements. As a result of the corrosion tests, it is determined that the corrosion rate increases as the aging time increase, especially the sample aged for 8 hours has the greater corrosion loss in the solution containing 6% H2SO4.

Keywords:

AA6063 aluminium alloy, heat treatment, corrosion,

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