Investigation of the Effects of Pore Widening Times on Oxide Pores on Pure Aluminum in Two-Step Anodic Oxidation Process

Year 2019, Issue: 17, 38 - 44, 31.12.2019

Halil Yılmaz , Mustafa Kocabas

https://doi.org/10.31590/ejosat.613555

Abstract

An anodic oxidation
process is a commonly used for surface treatment to improve the surface
properties of the metals and their alloys such as aluminum, tantalum, titanium,
molybdenum etc. and thereby increase the service life of the specimen parts
from these metals. A type of anodic oxidation process with different types and
conditions is made in the two-step anodic oxidation process. The two-step
anodic oxidation is a process that improves several surface properties, such as
increasing the corrosion resistance by forming a continuous layer on the
surface of a suitable metal such as aluminum. In a two-step anodic oxidation
process, which has a more regular pore array than  one-step anodic oxidation, nanotechnology
applications have been rapidly developing and with the potential production of
various nano-tubes and nano-wires. In this study, the two-step potentiostatic
anodic oxidation process on pure aluminum surface was investigated. For this
purpose, electrolytically polished samples were anodized at 0,3 M oxalic acid
solution at 40 V constant voltage for different times and were subjected to
pore expansion in 0.1 M phosphoric acid solution. The current density time
graphs obtained during anodic oxidation processes at constant voltages are
important for the reproducibility of the anodic oxidation process. The
properties of the anodic alumina in the porous structure obtained after pore
expansion at different times (0, 30 and 60 minutes) and the average pore
diameters were examined by SEM analysis. After the surface investigations, it
has been determined that pore arrays become smooth and pore
diameters increase depending on an increase in pore widening time. Depending on
the desired processes, the fabrication of nanowires/tubes with different sizes
can be carried out as desired uniform and homogeneous nanostructures.

Keywords

Pore diameters, Pore widening, , Pure Aluminum, Two-step anodic oxidation

Saf Alüminyuma Uygulanan İki Aşamalı Anodik Oksidasyon İşleminde Por Genişletme Süresinin Oksit Porlar Üzerindeki Etkilerinin İncelenmesi

Abstract

Anodik oksidasyon
işlemi alüminyum, tantalyum, titanyum, molibden vb. metal ve alaşımlarının
yüzey özelliklerini geliştirmek ve böylece bu metallerden üretilen parçaların
servis ömürlerini arttırmak için yaygın bir şekilde kullanılan bir yüzey
işlemidir. Çok farklı türlerde ve koşullrda yapılan anodik oksidasyon işleminin
bir çeşiti de iki aşamalı anodik oksidasyon işlemidir. İki aşamalı anodik
oksidasyon işlemi, alüminyum gibi uygun bir metalinin yüzeyinde sürekli bir
tabaka oluşturarak korozyon direncini arttırma gibi birçok yüzey özelliğini
geliştiren bir işlemdir. Tek aşamalı anodik oksidasyona göre daha düzenli bir
por dizilimine sahip olan iki aşamalı anodik oksidasyon işleminde,
nanoteknoloji uygulamaları çok hızlı bir gelişim göstermiş ve bununla beraber
çeşitli nano-tüpler ve nano-tellerin potansiyel üretimleri yapılmaktadır. Bu
çalışmada, saf alüminyum yüzeyinde iki aşamalı potansiyostatik anodik
oksidasyon işlemi incelenmiştir. Bu amaçla elektrolitik olarak parlatılan
numuneler 0,3 M oksalik asit çözeltisinde 40 V sabit gerilim değerinde farklı
sürelerde anodize edilen numuneler 0,1 M fosforik asit çözeltisinde por
genişletme işlemine tabi tutulmuştur. Sabit geriilim değerinde yapılan anodik
oksidasyon işlemleri sırasında elde edilen akım yoğunluğu süre grafikleri
anodik oksidasyon işleminin tekrarlanabilirliği açından önem arz etmektedir. Farklı
sürelerde (0, 30 ve 60 dakika) yapılan por genişletme işleminden sonra elde
edilen gözenekli yapıdaki anodik alüminanın homojenliği ve ortalama por çapları
gibi özellikleri yüzeyden yapılan SEM analizleriyle incelenmiştir. Yapılan
incelemeler sonunda artan por genişletme süresine bağlı olarak por
dizilimlerinin düzgünleştiği ve por çaplarının arttığı tespit edilmiştir.
İşlemlerin arzu
edilen şekilde yapılmasına
bağlı olarak farklı boyutlarda
sahip nanotellerin/tüplerin üretimi istenilen düzgün ve homojen nanoyapılar
şeklinde gerçekleştirilebilecektir.

 

Keywords

Por çapları, Por genişletme, Saf alüminyum, İki aşamalı anodik oksidasyon

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