Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 4

Porous anodic alumina formed on AA6063 aluminum alloy in a two-step process combining hard and mild anodization

10.15199/28.2016.4.3

Małgorzata Norek

nr katalogowy: 100288
10.15199/28.2016.4.3

Two-step process combining hard (in 0.3 M oxalic acid solution) and mild (in 0.1 M phosphoric acid solution) anodization at voltages ranging between 120 and 180 V was applied to prepare porous anodic alumina (PAA) on AA6063 alloy foil. The influence of ethanol on geometrical parameters of the PAAs was also tested. The analysis of the geometrical parameters as well as the current/voltage vs time transients suggested that alloying elements present in the AA6063 alloys play an important role in the relaxation of mechanical stresses at the metal/oxide interface occurring during the PAA’s growth. The effect contributed to comparable interpore distance Dc values (between 270÷370 nm) and similar regularity ratio parameter (RR) in the samples anodized in ethanol-free and ethanol-modified electrolyte, despite much larger average current densities registered for the former samples. The hexagonal pore ordering increased with the applied anodizing voltage. Key words: hard anodization, guided anodization, porous anodic alumina (PAA).1. INTRODUCTION Highly-ordered porous anodic alumina (PAA) is one of the most attractive templates for nanofabrication [1, 2]. Its geometrical parameters including pore diameter and pore arrangement, interpore distance, or PAA film thickness are easily controlled by anodizing conditions such as type of electrolyte, applied voltage, anodization time, or bath temperature [3, 4]. Usually PAA is fabricated on high-purity aluminium (99.999%) which by far hoists its production costs. Therefore, from economical point of view a replacement of the expensive high-purity aluminium for low-purity aluminium which is about two orders of magnitude cheaper is very desirable. The structural and compositional features of aluminium substrate play an important role in formation of long-range ordered porous anodic alumina. The low-purity aluminium contains a variety of alloying elements, which can bring about new behaviors during ano[...]

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