The Effect of Different Pre-Surface Finishing Method on the Aluminium Anodization of the 6XXX Series Alloy

Merve Özcan,Tunç Tuken,Ipek Biltaş,Bi̇lgehan Tunca

doi:10.36547/ams.27.4.1109

Abstract

In this study, the effect of different pre-surface finishing method on the aluminium anodization was investigated for AA 6063 alloy. Within the scope of pre-surface finishing method which is acidic solution concentrations and process time were determined. Acidic solution was determined by using hydrofluoric acid (HF) and nitric acid (HNO3). Also Gresoff LIM-5 LV chemical was used with different concentrations and process time for degreasing process. The etching effect of acidic solution on aluminium samples was investigated. The optimal etching behaviour was obtained with 1.0% concentration of HF and 3.2% concentration of HNO3 at 10 minutes process time. Also optimal surface properties were observed with 1.0% concentration of Gresoff LIM-5 LV at 12 minutes process time. Then anodic oxidation was performed by using 180 g / L sulfuric acid (H2SO4) and 18 volt (V). Surface morphology of the final aluminium profiles were examined with SEM analysis, Roughness, Gloss and Thickness tests.

Highlights

Aluminium is a relatively light metal with a specific density of 2.7 g/cm3 compared to metals such as steel, nickel, brass, and copper
Aluminium alloys have a wide range of applications for various purposes in many different industries due to their properties such as low density, high strength, superior mechanical behavior and workability [2].Al-Mg-Si system has a high fabricability. 6XXX aluminium alloy series which is defined Al-Mg-Si system is one of the widely used in application area [3]
Anodic oxidation can be defined as an electrochemical process in which a controlled oxide layer is formed on the metal surface [11]

Summary

Introduction

Aluminium is a relatively light metal with a specific density of 2.7 g/cm3 compared to metals such as steel, nickel, brass, and copper. The method of forming a protective oxide film or layer on the metal in order to prevent or slow down corrosion is called anodization which is defined pre-surface finishing process. Pre-surface finishing processes directly affect the adhesion, optical/mechanical properties and homogeneity of the anodized coating on the surface [12].

Results

Conclusion