AA6063 ALÜMİNYUM ALAŞIMININ H2SO4 ORTAMINDAKİ KOROZYON DAVRANIŞINA YAŞLANDIRMA SÜRESİNİN ETKİSİ

Year 2018, , 979 - 985, 20.07.2018

Alptekin Kısasöz

https://doi.org/10.28948/ngumuh.445447

Abstract

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.

Keywords

AA6063 alüminyum alaşımı, ısıl işlem, korozyon

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

Abstract

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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